EdStem 帖子合集

大家好，

我们正在使用Ed Discussion进行课堂问答。

这是提问课程（无论是课程内容还是行政事务）的最佳场所。您将在这里从教职员工和同学那里获得比通过电子邮件更快的答复。

这里有一些提示：

发帖前先搜索

为您认为有用的问题和答案点赞

回答您有信心回答的问题

与教职员工和同学分享有趣的课程相关内容

避免发布私密帖子，以便所有人都能从回复中受益

有关Ed Discussion的更多信息，您可以参考快速入门指南。

我将在周二下午2:00 - 3:30在CEPSR 625主持答疑时间。欢迎随时过来，即使只是打个招呼！

祝大家本学期一切顺利！

B博士

Hi everyone,

We're using Ed Discussion for class Q&A.

This is the best place to ask questions about the course, whether curricular or administrative. You will get faster answers here from staff and peers than through email.

Here are some tips:

Search before you post

Heart questions and answers you find useful

Answer questions you feel confident answering

Share interesting course related content with staff and peers

Avoid making a private post so that everyone can benefit from the response

For more information on Ed Discussion, you can refer to the Quick Start Guide.

I'll host office hours on Tuesday from 2:00 - 3:30 P.M. in CEPSR 625. Feel free to stop by, even just to say hi!

All the best this semester!

Dr. B

大家好！

希望你们开学第一天过得顺利！

如你所见，HW0 将于本周五到期。这是一个简短的入门作业，旨在让大家熟悉提交流程并登录我们将使用的课程服务器。

本次课程的所有作业，包括 HW0，都将在 GitHub 上进行。如果你还没有 GitHub 帐户，请创建一个（你可以使用你的个人帐户进行此课程）。

要访问 HW0，你必须在 Canvas 上的“quizzes”下完成 GitHub 用户名调查，或点击此处的直接链接。

如果你有任何问题，请随时发帖。

提醒一下，我们的第一次讲座将于明天在 Schermerhorn 501 举行（第一部分下午 4:10，第二部分下午 5:40）。我们非常激动见到大家！

— AP 教学人员

Hello everyone!

Hope your first day of classes is going well!

As you may have seen, HW0 is due this Friday. This is a short introductory homework designed to get you comfortable with the submission process and log in to the class server we'll be using.

All homework assignments for this class, including HW0, will be on GitHub. Please create a GitHub account if you don't have one already (you can use your personal account for this class).

To get access to HW0, you must complete the GitHub username survey on Canvas, under "quizzes", or click here for a direct link.

If you have any questions, feel free to make a post.

As a reminder, our first lecture is tomorrow in Schermerhorn 501 (4:10 PM for section 1, 5:40 PM for section 2). We're super excited to see you all!

— AP Teaching Staff

大家好！

希望你们第一天的课程顺利！

你们可能已经看到，HW0将于本周五截止。这是一份简短的入门作业，旨在让你们熟悉提交过程并登录我们将使用的班级服务器。

本课程的所有作业，包括HW0，都将在GitHub上进行。如果您还没有GitHub帐户，请创建一个（您可以使用您的个人帐户用于本课程）。

要访问HW0，您必须在Canvas上的“quizzes”下完成GitHub用户名调查，或点击此处直接链接。

如果您有任何问题，请随时发帖。

提醒一下，我们的第一次讲座将在明天Schermerhorn 501举行（第一节是下午4:10，第二节是下午5:40）。我们非常高兴见到大家！

—— AP 教学人员

Hello everyone!

Hope your first day of classes is going well!

As you may have seen, HW0 is due this Friday. This is a short introductory homework designed to get you comfortable with the submission process and log in to the class server we'll be using.

All homework assignments for this class, including HW0, will be on GitHub. Please create a GitHub account if you don't have one already (you can use your personal account for this class).

To get access to HW0, you must complete the GitHub username survey on Canvas, under "quizzes", or click here for a direct link.

If you have any questions, feel free to make a post.

As a reminder, our first lecture is tomorrow in Schermerhorn 501 (4:10 PM for section 1, 5:40 PM for section 2). We're super excited to see you all!

— AP Teaching Staff

当我执行 ssh uni @bsb.cs.columbia.edu 时，我的控制台返回：

The authenticity of host 'bsb.cs.columbia.edu (35.223.68.220)' can't be established.

ED25519 key fingerprint is SHA256:SY[rest of key].

This key is not known by any other names.

这是预期行为吗？我应该对“Are you sure you want to continue connecting?”回答“yes”吗？谢谢！

如果这有帮助，我使用的是 ARM macOS 26 终端和 zsh

When I did ssh uni@bsb.cs.columbia.edu my console returned

The authenticity of host 'bsb.cs.columbia.edu (35.223.68.220)' can't be established.

ED25519 key fingerprint is SHA256:SY[rest of key].

This key is not known by any other names.

Is this intended behavior, and should I respond yes to Are you sure you want to continue connecting? Thanks!

If it helps, I'm using an ARM macOS 26 terminal with zsh

嗨！当我尝试访问服务器时，我收到“ssh: connect to host bsb.cs.columbia.edu port 22: Connection refused.”。我该如何排除故障？谢谢！

Hi! When I try to access the server, I get "ssh: connect to host bsb.cs.columbia.edu port 22: Connection refused." How should I go about troubleshooting this? Thank you!

你好！当我尝试访问服务器时，我收到“ssh: connect to host bsb.cs.columbia.edu port 22: Connection refused.”。我该如何解决这个问题？谢谢！

Hi! When I try to access the server, I get "ssh: connect to host bsb.cs.columbia.edu port 22: Connection refused." How should I go about troubleshooting this? Thank you!

你好！

所有提交了 GitHub 用户名调查并接受了 GitHub 邀请的人现在都应该可以访问 HW0。如果您在访问时需要帮助，请单独发帖询问。

提醒一下，HW0 的书面部分截止日期是本周五晚上 11:55。此外，您必须在 1 月 26 日星期一晚上 5:30 之前提交团队表格（HW0 说明中链接）。即使您打算单独工作，也必须提交表格。

如果您正在寻找队友，请随时在下面的帖子中发表评论。请记住在找到队友后将您的评论标记为已解决。请注意，HW0 必须单独完成。HW1 之后会有重新组队的机会。

很快再见！

Hello!

Everyone who submitted the GitHub username survey and accepted the GitHub invitation should now have access to HW0. If you need help accessing it, please ask in a separate post.

As a reminder, the written part of HW0 is due this Friday at 11:55pm. Additionally, you must submit the team form (linked in the HW0 instructions) by Monday, Jan 26th at 5:30pm. You must submit the form even if you intend to work alone.

If you're looking for a teammate, feel free to post a comment in the thread below. Please remember to mark your comment as resolved when you've found a teammate. Note that HW0 must be completed individually. There will be regrouping opportunities after HW1.

See you soon!

大家好！

所有提交了 GitHub 用户名调查并接受了 GitHub 邀请的人现在都应该可以访问 HW0。如果您需要帮助访问，请另发帖子提问。

提醒一下，HW0 的书面部分截止日期是本周五晚上 11:55。此外，您必须在 1 月 26 日星期一 下午 5:30 之前提交团队表格（在 HW0 说明中链接）。即使您打算单独工作，也必须提交表格。

如果您正在寻找队友，请随时在下面的帖子中发表评论。请记住，找到队友后请将您的评论标记为已解决。请注意，HW0 必须单独完成。HW1 之后会有重新组队的机会。

再会！

Hello!

Everyone who submitted the GitHub username survey and accepted the GitHub invitation should now have access to HW0. If you need help accessing it, please ask in a separate post.

As a reminder, the written part of HW0 is due this Friday at 11:55pm. Additionally, you must submit the team form (linked in the HW0 instructions) by Monday, Jan 26th at 5:30pm. You must submit the form even if you intend to work alone.

If you're looking for a teammate, feel free to post a comment in the thread below. Please remember to mark your comment as resolved when you've found a teammate. Note that HW0 must be completed individually. There will be regrouping opportunities after HW1.

See you soon!

假设服务器是故意最小化的，这正确吗？

我们应该安装任何额外的软件包，还是保持原样就好？

Is it correct to assume the server was intentionally minimized?

Should we install any additional packages, or is it fine to leave it as it is?

嗨！我在 cs3157-borowski-hw GitHub 组织中，用户名为 tahalahlou，但我还没有看到 HW0 仓库的访问权限。如果我这边还需要做些什么，请告诉我，谢谢！

Hi! I’m in the cs3157-borowski-hw GitHub organization under the username tahalahlou, but I don’t see access to the HW0 repository yet. Let me know if anything else is needed on my end thanks!

我们可以和不同班级的同学组队吗，还是说我的队友必须和我同班？

Can we partner with someone who is in another section of the class, or does our teammate need to be in the same section as me?

下午好,

我刚刚提交了我的 GitHub 帐户，抱歉迟了。请您在有空的时候将我添加到 HW0。

good afternoon,

I just had my github account submit, sorry for the late. please add me to HW0 whenever you are avialble

嗨，我无法访问 HW0，我的用户名是 sarahaiii。有人能帮我解决这个问题吗？非常感谢！

Hi I'm cannot access HW0 and I'm under the username sarahaiii. Could someone help me fix that? Thanks so much!!

你好，

今天的录音稍后会提供吗？它尚未在视频库中在线提供。

谢谢

Hi,

Will today's recording become available later? It's not yet available online in the video library.

Thanks

大家好,

B 教授和助教团队将于下周五，1 月 30 日下午 2 点举行一次 Zoom 答疑课，时长最多 1 小时。我们将讲解 Bash 基础知识，并协助设置服务器访问/配置。

请提问！

https://columbiauniversity.zoom.us/j/97336529100?pwd=aEmFgnALVXNUNqne45L47L5sJk8TNB.1

会议 ID: 973 3652 9100

密码: 688298

稍后见，

AP 教学团队

Hi all,

Dr. B. and the TA team will hold a Zoom recitation next Friday, January 30th, at 2 P.M. for at most 1 hour. We will cover bash basics and help with setting up server access/configurations.

Please ask questions!

https://columbiauniversity.zoom.us/j/97336529100?pwd=aEmFgnALVXNUNqne45L47L5sJk8TNB.1

Meeting ID: 973 3652 9100

Passcode: 688298

See you later,

AP Teaching Staff

你好，

在克隆 GitHub 仓库时，HTTPS 和 SSH 部分提供的链接有什么区别？我指的是下面的这个链接，以及如果我点击 SSH 会显示的链接。

在 BSB 服务器上，当我使用 HTTPS 链接进行 git clone 时，系统会提示我输入 GitHub 用户名和密码，然后出现身份验证错误。如果我使用 SSH，就不再需要这些信息了。这是故意的吗？

谢谢

Hi,

What is the difference between the links provided in the HTTPS and SSH sections of GitHub when cloning a repository? I am referring to this link below and to the link that would show up if I clicked on SSH.

In the BSB server, when I do git clone with the HTTPS link, I get prompted to write my GitHub username and password and then get an authentication error. If I use SSH I no longer get asked for that information. Is that intentional?

Thanks

你好！

我只是想再次确认一下，这样我就不会因为格式而丢分了。

我在我的 written.txt 中输入了以下内容：

姓名：Arthur Roshal

学号：ar4857

专业、学院、年份：计算机科学，哥伦比亚工程学院，2026

这是预期的格式吗？我的意思是，它从未要求填空，但我觉得这样有意义。

Hello!

I just want to double check, so that I do not lose any points for format.

I put in my written.txt the following:

Name: Arthur Roshal

Uni: ar4857

Major, School, Year: computer science, Columbia Engineering, 2026

Is this what was expected? I mean, it was never written to fill the blanks, but I though that makes sense.

你好！

我只是想再次确认一下，这样我就不会因为格式问题而扣分了。

我在我的 written.txt 中填写了以下内容：

Name: Arthur Roshal

Uni: ar4857

Major, School, Year: computer science, Columbia Engineering, 2026

这是预期的吗？我的意思是，从来没有要求填写空白，但我觉得这样有道理。

Hello!

I just want to double check, so that I do not lose any points for format.

I put in my written.txt the following:

Name: Arthur Roshal

Uni: ar4857

Major, School, Year: computer science, Columbia Engineering, 2026

Is this what was expected? I mean, it was never written to fill the blanks, but I though that makes sense.

你好！

我只是想再次确认，以免因格式问题扣分。

我在 written.txt 中输入了以下内容：

姓名：Arthur Roshal

学号：ar4857

专业、学院、年级：计算机科学，哥伦比亚工程学院，2026

这就是预期的吗？我的意思是，它从来没有要求填空，但我认为这样做有道理。

Hello!

I just want to double check, so that I do not lose any points for format.

I put in my written.txt the following:

Name: Arthur Roshal

Uni: ar4857

Major, School, Year: computer science, Columbia Engineering, 2026

Is this what was expected? I mean, it was never written to fill the blanks, but I though that makes sense.

你好！

在尝试连接到我的BSB服务器账户时，输入密码后出现了“连接关闭”错误。这也是因为我输入了错误的密码吗？

Hi!

When trying to connect to my BSB server account, a 'connection closed' error occurred after me entering the password. Is it also because i entered the wrong password?

嗨！

在尝试连接到我的 BSB 服务器账户时，输入密码后出现了“连接关闭”错误。这也是因为我输入了错误的密码吗？

Hi!

When trying to connect to my BSB server account, a 'connection closed' error occurred after me entering the password. Is it also because i entered the wrong password?

各位助教和B博士，你们好！

我在BSB服务器上玩了玩C语言编程，有几个问题：

使用服务器时我遇到的问题列表：

像sudo shutdown now或任何“sudo”命令听起来都很有破坏性，因为sudo基本上是获取完全控制权（据我所知）。这样的命令仍然可行和可以吗？

使用这个服务器创建我自己的C文件（就像我刚刚创建的那个）可能会占用空间。这会占用所有使用BSB的人的空间吗？（我猜实际上是这样）如果是这样，有没有可能所有人的空间都用完了？如果我在BSB服务器上的自己的实例运行一个有100个堆栈的递归，而显然每个人都想在BSB上尝试这样做，它可能会耗尽RAM或任何类型的内存。会发生什么？我们会收到错误消息吗？服务器会崩溃吗？

使用这样一个私密的、少于200人的服务器有什么一般准则？有什么特别需要担心的事情吗？

Hello TA's and Dr.B!

I played around with C Programming on the BSB server, and I had a few questions:

List of Questions I had using the server:

Commands like sudo shutdown now, or any "sudo" command sounds pretty destructive, as sudo is basically assuming full control (from what I know). Are commands like that still viable and okay?

Using this server to create my own C files like the one I just created probably takes up space. Does it take up space for EVERYONE using BSB? (Im assuming that's true actually) If so, can there be an incident where everyone runs out of space? If my own instance on the BSB server runs a recursion with a 100 stacks, and apparently everyone wanted to try that on BSB, it will probably run out of RAM or any type of memory. What would happen? Would we get an error message? Would the server bust?

What are some of the general guidelines to using such private sub200 people server? Any super scary things we should worry about?

各位助教和B博士好！

我在BSB服务器上玩了玩C语言编程，有几个问题：

使用服务器时我遇到的一些问题列表：

像 sudo shutdown now 这样的命令，或者任何“sudo”命令听起来都很有破坏性，因为 sudo 基本上是假定完全控制（据我所知）。这样的命令仍然有效并且可以使用吗？

使用这个服务器创建我自己的C文件（就像我刚才创建的那个）可能会占用空间。这会占用所有使用BSB的人的空间吗？（我猜这是真的）如果是这样，会不会发生所有人都用完空间的情况？如果我在BSB服务器上的自己的实例运行一个有100个堆栈的递归，并且显然每个人都想在BSB上尝试这样做，那很可能会耗尽RAM或任何类型的内存。会发生什么？我们会收到错误消息吗？服务器会崩溃吗？

使用这样一个不到200人的私有服务器有什么一般准则吗？有什么我们应该特别担心的事情吗？

Hello TA's and Dr.B!

I played around with C Programming on the BSB server, and I had a few questions:

List of Questions I had using the server:

Commands like sudo shutdown now, or any "sudo" command sounds pretty destructive, as sudo is basically assuming full control (from what I know). Are commands like that still viable and okay?

Using this server to create my own C files like the one I just created probably takes up space. Does it take up space for EVERYONE using BSB? (Im assuming that's true actually) If so, can there be an incident where everyone runs out of space? If my own instance on the BSB server runs a recursion with a 100 stacks, and apparently everyone wanted to try that on BSB, it will probably run out of RAM or any type of memory. What would happen? Would we get an error message? Would the server bust?

What are some of the general guidelines to using such private sub200 people server? Any super scary things we should worry about?

嗨！

我已按照说明操作，并按照下面链接的指南完成了所有步骤，包括生成密钥、将 SSH 密钥添加到 ssh-agent 以及将 SSH 密钥添加到 GitHub。但是，我是否需要执行最后一步，即为硬件安全密钥生成新的 SSH 密钥？

https://docs.github.com/en/authentication/connecting-to-github-with-ssh/generating-a-new-ssh-key-and-adding-it-to-the-ssh-agent?platform=linux

谢谢！

Hi!

I have followed the instructions, and on the guide linked below, I followed all the steps including generating the key, adding the SSH key to the ssh-agent, and adding the SSH key to Github. However, do I need to the final step, which is generating a new SSH key for a hardware security key?

https://docs.github.com/en/authentication/connecting-to-github-with-ssh/generating-a-new-ssh-key-and-adding-it-to-the-ssh-agent?platform=linux

Thank you!

你好！

我已经按照说明操作，并按照下面链接的指南完成了所有步骤，包括生成密钥、将SSH密钥添加到ssh-agent以及将SSH密钥添加到Github。但是，我需要执行最后一步，即为硬件安全密钥生成新的SSH密钥吗？

https://docs.github.com/en/authentication/connecting-to-github-with-ssh/generating-a-new-ssh-key-and-adding-it-to-the-ssh-agent?platform=linux

谢谢！

Hi!

I have followed the instructions, and on the guide linked below, I followed all the steps including generating the key, adding the SSH key to the ssh-agent, and adding the SSH key to Github. However, do I need to the final step, which is generating a new SSH key for a hardware security key?

https://docs.github.com/en/authentication/connecting-to-github-with-ssh/generating-a-new-ssh-key-and-adding-it-to-the-ssh-agent?platform=linux

Thank you!

嗨！

我已经按照说明操作了，并且在下面链接的指南中，我遵循了所有步骤，包括生成密钥、将SSH密钥添加到ssh-agent以及将SSH密钥添加到Github。但是，我需要执行最后一步，即为硬件安全密钥生成新的SSH密钥吗？

https://docs.github.com/en/authentication/connecting-to-github-with-ssh/generating-a-new-ssh-key-and-adding-it-to-the-ssh-agent?platform=linux

谢谢！

Hi!

I have followed the instructions, and on the guide linked below, I followed all the steps including generating the key, adding the SSH key to the ssh-agent, and adding the SSH key to Github. However, do I need to the final step, which is generating a new SSH key for a hardware security key?

https://docs.github.com/en/authentication/connecting-to-github-with-ssh/generating-a-new-ssh-key-and-adding-it-to-the-ssh-agent?platform=linux

Thank you!

这可能是一个愚蠢的问题，但我只是想确认我是否理解正确。在附图中，[class] 服务器在哪里出现——具体来说，我们实际在什么时候使用它？

This might be a silly question, but I just want to check whether I’m understanding this correctly. In the attached diagram, where does the [class] server come in—specifically, at what point do we actually use it?

嗨！我看到CourseWorks上有一些测验，但我想知道这些测验是否会和作业一起到期，或者会怎样？（我找不到这些测验的截止日期）

另外，第一个和第二个测验有什么区别呢？例如，我看到有一个测验1和一个测验1a？

谢谢！

Hi! I saw that there are quizzes to take on CourseWorks but I was wondering if those will be due with the homeworks or how that's going to be? (I couldn't find due date for those)

and also what would be the difference between the first one and the second one, for example I see there is a Quiz 1 and a Quiz 1a?

Thank you!

嗨，AP！

我们已经在 Courseworks 上发布了关于作业0的成绩和评论。这份作业只占2分，所以它对您的期末成绩影响很小。如果您没有获得2/2分，请查看评论并确保您理解在哪里失分。未来的作业对于提交错误将几乎不予宽容。

作业1将于周一晚上发布，请务必在截止日期前（周一晚上5:30之前）提交您的团队信息。

一如既往，如果您有任何问题，请告诉我们。

— AP 教学人员

Hi AP!

We have released grades and comments on Courseworks about HW0. This assignment only counted for 2 points, so it will have little effect over your final grade. If you didn't get 2/2, please review the comments and make sure you understand where you lost points. Future assignments will show little to no leniency regarding submission errors.

HW1 will be released on Monday night, so make sure to get your Team info submitted by the deadline (Monday before 5:30 PM).

As always, please let us know if you have any questions.

— AP Teaching Staff

大家好，AP 助教！

我们已经在 Courseworks 上发布了 HW0 的成绩和评论。本次作业仅计 2 分，因此对您的最终成绩影响甚微。如果您未获得满分 (2/2)，请仔细阅读评论，确保您理解扣分原因。未来的作业对提交错误将几乎不予宽容。

HW1 将于周一晚上发布，请务必在截止日期前（周一晚上 5:30 之前）提交您的团队信息。

一如既往，如有任何问题，请告诉我们。

—— AP 助教团队

Hi AP!

We have released grades and comments on Courseworks about HW0. This assignment only counted for 2 points, so it will have little effect over your final grade. If you didn't get 2/2, please review the comments and make sure you understand where you lost points. Future assignments will show little to no leniency regarding submission errors.

HW1 will be released on Monday night, so make sure to get your Team info submitted by the deadline (Monday before 5:30 PM).

As always, please let us know if you have any questions.

— AP Teaching Staff

嗨 - 想知道明天的助教答疑课是否在线，如果是，链接是什么？

Hi - was wondering if tomorrow's TA OH will be online and if so, what the link is?

您好 - 想知道明天的助教答疑课是否在线，如果是的话，链接是什么？

Hi - was wondering if tomorrow's TA OH will be online and if so, what the link is?

大家好,

由于下雪，我的答疑课明天将在线进行。链接在此：https://meet.google.com/bai-eqit-mwo。您也可以在课程日历上找到它。

此致,

Koral

Hi all,

My OH will be online tomorrow due to the snow. Here's the link: https://meet.google.com/bai-eqit-mwo. You can also find it on the course calendar.

Best,

Koral

这是我们1月26日办公时间的Zoom信息！到时候见！

主题：Grace + Tejas 办公时间：2026年1月26日 晚上08:30 （美国和加拿大东部时间）加入Zoom会议 https://us05web.zoom.us/j/81511952974?pwd=Am05eOi2Vw5xvOuqTY9A6pnNakxwQx.1

会议ID：815 1195 2974 密码：Dp6Tfc

Here is the zoom information for our office hours 1/26! See you there!

Topic: Grace + Tejas OH Time: Jan 26, 2026 08:30 PM Eastern Time (US and Canada) Join Zoom Meeting https://us05web.zoom.us/j/81511952974?pwd=Am05eOi2Vw5xvOuqTY9A6pnNakxwQx.1

Meeting ID: 815 1195 2974 Passcode: Dp6Tfc

这是我们1月26日办公时间的Zoom信息！到时候见！

主题：Grace + Tejas OH 时间：2026年1月26日晚上8:30（美国和加拿大东部时间） 加入Zoom会议 https://us05web.zoom.us/j/81511952974?pwd=Am05eOi2Vw5xvOuqTY9A6pnNakxwQx.1

会议ID：815 1195 2974 密码：Dp6Tfc

Here is the zoom information for our office hours 1/26! See you there!

Topic: Grace + Tejas OH Time: Jan 26, 2026 08:30 PM Eastern Time (US and Canada) Join Zoom Meeting https://us05web.zoom.us/j/81511952974?pwd=Am05eOi2Vw5xvOuqTY9A6pnNakxwQx.1

Meeting ID: 815 1195 2974 Passcode: Dp6Tfc

我有点困惑我的 Mac 应该下载哪些可选软件。我应该只下载 multipass 还是需要下载所有 3 个（oracle virtualbox、virtualbox image 和 multipass）？如果这听起来像个愚蠢的问题，我很抱歉！

I'm a bit confused on which optional software to download for my Mac. Should I just download multipass or do i need to download all 3 (oracle virtualbox, virtualbox image, and multipass)? sorry if this seems like a dumb question!

嗨，AP！

我们刚刚在 GitHub 上发布了 HW1。截止日期是 2 月 3 日星期二晚上 11:55（你可以使用延迟提交天数，直到 2 月 5 日星期四晚上 11:55）。

提前截止日期：25 年 2 月 2 日晚上 11:55 (+2)

标准截止日期：25 年 2 月 3 日晚上 11:55 (+0)

延迟截止日期：25 年 2 月 4 日晚上 11:55 (-1)

最终截止日期：25 年 2 月 5 日晚上 11:55 (-2)

如果您已接受 HW0 中 GitHub 组织的邀请，可以通过访问 https://github.com/orgs/cs3157-borowski-hw/repositories 访问您团队的仓库。

如果您没有接受 GitHub 组织的邀请，您应该会收到一封来自 GitHub 的电子邮件（您注册 GitHub 时使用的电子邮件），标题为“carl-vbn invited you to cs3157-borowski-hw/hw1-X”，其中 X 是您的团队编号。您必须按照该电子邮件中的说明接受仓库邀请。

如果您没有收到这些邀请中的任何一个，则说明您未提交一个或多个表格，或向我们提供了不正确的 UNI 或 GitHub 用户名。如果是这种情况，请在 Ed 上发布私有帖子与我们联系。将来，您必须提交准确的信息才能按时开始作业。

此外，我们将在本帖中以评论的形式提供任何澄清，因此强烈建议您点击“关注”选项以获取我们更新的电子邮件通知。如果您对澄清有任何疑问，请另开一个帖子，不要在公告下方评论。

团队作业已在此处发布。您只能与您的队友协作。

祝 HW1 好运！

Hi AP!

We just released HW1 on GitHub. It is due on Tuesday, February 3rd, at 11:55 p.m. (you may use late days until Thursday, February 5th, at 11:55 p.m.).

Early Deadline: 2/2/25 11:55 p.m. (+2)

Standard Deadline: 2/3/25 11:55 p.m. (+0)

Late Deadline: 2/4/25 11:55 p.m. (-1)

Hard Deadline: 2/5/25 11:55 p.m. (-2)

If you have accepted the GitHub organization invitation as part of HW0, you can access your team's repository by going to https://github.com/orgs/cs3157-borowski-hw/repositories.

If you did not accept the GitHub organization invite, you should have received an email from GitHub (the email you signed up for GitHub with) titled "carl-vbn invited you to cs3157-borowski-hw/hw1-X" where X is your team number. You must follow the directions in that email to accept the repository invite.

If you did not get either of these invites, you did not submit one or more of the forms or gave us an incorrect UNI or GitHub username. If this is the case, please reach out to us by making a private post on Ed. In the future, you must submit accurate information to start assignments on time.

In addition, we will provide any clarifications as comments on this thread, so it is highly recommended that you click the "watch" option to get email notifications about updates we make. If you have any questions about the clarifications, please make a separate thread and do not comment under the announcement.

Team assignments are posted here. You may only collaborate with your teammate.

Good luck on HW1!

各位同学好！

我们刚刚在 GitHub 上发布了第一次作业（HW1）。截止日期是2月3日星期二晚上11:55（你可以使用延期天数直到2月5日星期四晚上11:55）。

提前截止日期：25年2月2日晚上11:55（+2）

标准截止日期：25年2月3日晚上11:55（+0）

延迟截止日期：25年2月4日晚上11:55（-1）

最终截止日期：25年2月5日晚上11:55（-2）

如果你已经接受了第一次作业（HW0）中的 GitHub 组织邀请，你可以通过访问 https://github.com/orgs/cs3157-borowski-hw/repositories 来访问你团队的仓库。

如果你没有接受 GitHub 组织邀请，你应该会收到一封来自 GitHub 的邮件（你注册 GitHub 的邮箱），标题为“carl-vbn invited you to cs3157-borowski-hw/hw1-X”，其中 X 是你的团队编号。你必须按照邮件中的指示接受仓库邀请。

如果你没有收到这些邀请中的任何一个，说明你没有提交一份或多份表格，或者提供了不正确的 UNI 或 GitHub 用户名。如果是这种情况，请通过在 Ed 上发布私有帖子联系我们。将来，你必须提交准确的信息才能按时开始作业。

此外，我们将在本帖中提供任何澄清，因此强烈建议你点击“关注”选项以获取我们更新的电子邮件通知。如果你对澄清有任何疑问，请另开一个帖子，不要在公告下评论。

团队分工已在此处发布。你只能与你的队友合作。

祝你第一次作业顺利！

Hi AP!

We just released HW1 on GitHub. It is due on Tuesday, February 3rd, at 11:55 p.m. (you may use late days until Thursday, February 5th, at 11:55 p.m.).

Early Deadline: 2/2/25 11:55 p.m. (+2)

Standard Deadline: 2/3/25 11:55 p.m. (+0)

Late Deadline: 2/4/25 11:55 p.m. (-1)

Hard Deadline: 2/5/25 11:55 p.m. (-2)

If you have accepted the GitHub organization invitation as part of HW0, you can access your team's repository by going to https://github.com/orgs/cs3157-borowski-hw/repositories.

If you did not accept the GitHub organization invite, you should have received an email from GitHub (the email you signed up for GitHub with) titled "carl-vbn invited you to cs3157-borowski-hw/hw1-X" where X is your team number. You must follow the directions in that email to accept the repository invite.

If you did not get either of these invites, you did not submit one or more of the forms or gave us an incorrect UNI or GitHub username. If this is the case, please reach out to us by making a private post on Ed. In the future, you must submit accurate information to start assignments on time.

In addition, we will provide any clarifications as comments on this thread, so it is highly recommended that you click the "watch" option to get email notifications about updates we make. If you have any questions about the clarifications, please make a separate thread and do not comment under the announcement.

Team assignments are posted here. You may only collaborate with your teammate.

Good luck on HW1!

大家好，

请查看下方来自 CARDS 的消息，如果您对此机会感兴趣，请直接与该办公室联系。

此致，

B 博士

无障碍资源与残疾服务中心 (CARDS) - COMS W3157.001 - 高级编程（CRN: 12346）需要课程笔记员

此消息旨在通知您，有位同学需要笔记员。如果您愿意做笔记（并成功受聘），CARDS 可以为每门课程支付每学期 250 美元的津贴。如果您感兴趣，可以直接通过我们的 AIM 数据库注册（点击主屏幕上的“sign up as note-taker”）：https://hood.accessiblelearning.com/Barnard/

登录为笔记员后，请点击屏幕顶部的“Note-taker”选项卡。然后您可以输入您希望为其做笔记的每门课程的 5 位数 CRN（每个框中输入一个 CRN）。CRN 可以在 CU 课程目录中找到。

提交笔记员申请后，CARDS 要求申请人提交两份样本笔记以供审查，作为申请过程的一部分。点击此处提交样本笔记！我们感谢您为您的同学提供的帮助！

Hi all,

Please see the message below from CARDS and interact directly with that office if you are interested in the opportunity.

Best,

Dr. B

Center for Accessibility Resources & Disability Services (CARDS) - Course Notetaker Needed for COMS W3157.001 - ADVANCED PROGRAMMING (CRN: 12346)

This message is to notify you that a classmate is in need of a note-taker. CARDS is able to pay a $250 stipend per course for the semester if you are willing to take notes (and are successfully hired). If you are interested, you can sign up directly through our AIM database (by clicking "sign up as note-taker" on the main screen): https://hood.accessiblelearning.com/Barnard/

Once you sign in as a note-taker, please click the Note-taker tab at the top of the screen. You can then enter the 5-digit CRN for each class for which you'd like to apply to take notes (one CRN should be entered per box). CRNs can be found on the CU Directory of Classes.

After you have submitted your note-taker application, CARDS requires applicants to submit two sets of sample notes for review as part of the application process. Click here to submit sample notes! We appreciate your assistance for your fellow classmate!

你好！我只想澄清一下这一点（“问题”标题下的说明 6）：

“注意：带有警告的执行（如 4 所示）应使用成功退出代码。”

这应该是 3 而不是 4 吗？警告示例显示在说明 3 中（其中 notfound1.txt 和 notfound2 会产生警告），而不是说明 4 中（它讨论了使用 -l 标志列出文件）。我只是想确认一下此说明指的是哪个部分。谢谢！

Hi! Just want to make a clarification of this (instruction 6 under title "Problem"):

"Note: An execution with warnings (as shown in 4) should use the success exit code."

Should this be 3 instead of 4? The warnings example is shown in instruction 3 (where notfound1.txt and notfound2 produce warnings), not instruction 4 (which discusses listing files with -l flag). Just wanted to confirm which section this note is referring to. Thanks!

嗨！只是想澄清一下这个（“问题”标题下的说明 6）：

“注意：带有警告的执行（如 4 所示）应使用成功退出代码。”

这应该是 3 而不是 4 吗？警告示例显示在说明 3 中（其中 notfound1.txt 和 notfound2 会产生警告），而不是说明 4（它讨论了使用 -l 标志列出文件）。只是想确认一下此注释指的是哪个部分。谢谢！

Hi! Just want to make a clarification of this (instruction 6 under title "Problem"):

"Note: An execution with warnings (as shown in 4) should use the success exit code."

Should this be 3 instead of 4? The warnings example is shown in instruction 3 (where notfound1.txt and notfound2 produce warnings), not instruction 4 (which discusses listing files with -l flag). Just wanted to confirm which section this note is referring to. Thanks!

大家好，这个问题与作业 1 没有直接关系，但我想知道 VS Code 远程 SSH 是否允许在服务器 bsb.cs.columbia.edu 上使用？

谢谢！

Hi, this question isn’t directly related to Homework 1, but I was wondering whether VS Code remote SSH is allowed on the server bsb.cs.columbia.edu?

Thank you!

您好，这个问题与作业1没有直接关系，但我想知道bsb.cs.columbia.edu服务器是否允许使用VS Code远程SSH？

谢谢！

Hi, this question isn’t directly related to Homework 1, but I was wondering whether VS Code remote SSH is allowed on the server bsb.cs.columbia.edu?

Thank you!

你好，

出于好奇，我可以在虚拟机上运行 sudo rm -rf / 而不会破坏我的宿主机吗？

我的理解是虚拟机与我的实际笔记本电脑完全隔离，所以把虚拟机搞得一团糟应该对我的机器没有任何影响。这是对的吗？

谢谢

编辑：我想 Ubuntu 有安全措施可以阻止我删除某些文件，即使我使用了 sudo，但这些安全措施应该可以以某种方式禁用，对吗？

Hi,

Can I run sudo rm -rf / on the VM (out of curiosity) and not break my host machine?

My understanding is that the VM is entirely isolated from my actual laptop, so messing up the VM really bad should have no effect whatsoever on my machine. Is that correct?

Thanks

Edit: I suppose Ubuntu has safeguards that prevent me from deleting certain files even if I use sudo, but I suppose these safeguards can be disabled somehow, right?

根据 Multipass 设置指南：

“您的整个 macOS 主目录会自动与 Ubuntu 访客虚拟机共享... cd Home 进入您的 macOS 主目录”

当我 cd Home 然后 ls 时，什么都没有显示 (ls -l 显示总计 0)

这是预期的吗？

According to the Multipass Setup guide:

"Your whole macOS home directory is automatically shared with the Ubuntu guest virtual machine... cd Home to move into your macOS home directory"

When I cd Home, then ls, nothing shows up (ls -l gives total 0 )

Is this expected?

出于好奇，我尝试在一个文件夹的终端中删除该文件夹，但我不明白为什么即使删除了该文件夹，pwd 和该文件夹的父目录 (..) 仍然没有改变。然而，如果删除后，我 cd 到父目录，被删除的文件夹就不再是子目录了。那么当使用 rmdir 删除一个文件夹时，它是否只断开父目录到子目录的连接，而不是子目录到父目录的连接？这个问题可能有点令人困惑，所以附上了终端命令

/ag5250$ mkdir test

/ag5250$ cd test

/ag5250/test$ rmdir ../test

/ag5250/test$ pwd

/mnt/disks/students261/ag5250/test

/ag5250/test$ cd ..

/ag5250$ cd -

-bash: cd: /mnt/disks/students261/ag5250/test: No such file or directory

So out of curiosity I tried deleting a folder while being in the folder's terminal and don't particularly understand why even after deleting the folder the pwd and the parent (..) of the folder doesn't change. However, if after deleting, I cd to the parent directory, the deleted folder is no longer a child. So when deleting a folder using rmdir, does it only break the connection from the parent to the child and not from the child to the parent? This question might be a bit confusing so attached the terminal commands

/ag5250$ mkdir test

/ag5250$ cd test

/ag5250/test$ rmdir ../test

/ag5250/test$ pwd

/mnt/disks/students261/ag5250/test

/ag5250/test$ cd ..

/ag5250$ cd -

-bash: cd: /mnt/disks/students261/ag5250/test: No such file or directory

大家好，这里是你们在今天讲座期间提问的地方！

过程很简单，有问题吗？在这里发布，你就会收到目前在听你讲座的助教的回复。

Hello, this will be a place for you to ask questions during today's lecture!

The process is simple, have a question? Post it here and you'll get a reply from the TA who is currently sitting in on your lecture.

大家好，这里是大家在今天的讲座中提问的地方！

过程很简单，有问题吗？在这里发布，您将收到正在旁听您讲座的助教的回复。

Hello, this will be a place for you to ask questions during today's lecture!

The process is simple, have a question? Post it here and you'll get a reply from the TA who is currently sitting in on your lecture.

想学习更多关于 Bash 的知识？对 cd 和 ls 感到困惑？喜欢通过游戏学习吗？

GameShell 就是适合你的游戏！

这是一个很酷的基于终端的游戏，你可以使用 Bash 命令探索一个充满宝藏的世界。

游戏已安装在 bsb 服务器上，你只需在主目录中运行 gameshell，它就会将你的游戏进度保存在你的目录中！

你可以在这里了解更多信息或在本地机器上安装它：

https://github.com/phyver/GameShell/

玩得开心！

附注：提醒一下，我们将在周五下午 2 点举办 Bash 和设置复习课。我建议在会话前安装 VirtualBox (Windows) 或 Multipass (Mac)，以便做好准备！

Multipass Setup Guide

Virtual Box Link

Wish to learn more about Bash? Confused about cd and ls? Like learning through games?

GameShell is the game for you!

It's a cool terminal-based game where you explore a world full of treasures using Bash commands.

The game has been installed on the bsb server, all you need to do is run gameshell in your home directory, and it will save your game progress in your directory!

You can learn more about it here or install it on your local machine:

https://github.com/phyver/GameShell/

Enjoy!

P.S.: Reminder that we'll host a Bash & Setup review session on Friday at 2 pm. I recommend installing VirtualBox (Windows) or Multipass (Mac) before the session so you're prepared!

Multipass Setup Guide

Virtual Box Link

大家好，

我了解到有时巴纳德学院的学生无法访问存储在哥伦比亚大学 Google Drive 上的数据。如果需要访问，请务必使用您的哥伦比亚大学账户登录 Google。我不得不拒绝了一些来自个人电子邮件地址的请求。

此致，

B 博士

Hi all,

I understand that sometimes Barnard students do not get access to data stored on Google Drive at Columbia. If you need access, be sure to login to Google with your Columbia account. I had to deny a few requests that were sent from personal email addresses.

Sincerely,

Dr. B

你好，

我们有一些关于第一次作业的问题。首先，如果主目录下有一个名为 .junk 的文件而不是目录，该怎么办？是应该报错还是应该删除这个现有的 .junk 文件？其次，如果有多个标志，但其中一个标志是 -h，是应该像 -h 那样输出帮助信息，还是因为有多个标志而报错？

感谢你的帮助。

Hi,

We had a few questions regarding hw1. First, if there were a file not directory called .junk in home, what should be done? Should there be an error or should this existing .junk file be deleted? Second, if there are multiple flags, but one of them is the -h flag, should it output the help like -h or an error for multiple flags?

Thanks for your help.

硬件规范说工作必须在 src 目录中完成。在 bsb 服务器中，"cs3157" 目录应该是 src 目录的父目录吗？或者一个名为 "hw1-96" 的目录需要成为 src 目录的父目录吗？

谢谢

The hw spec says work must be done inside the src directory. In bsb server, is the "cs3157" directory supposed to be the parent of the src directory? or Does a directory called "hw1-96" need to be the parent of the src directory?

Thank you

如果 .junk 文件夹包含软链接，当我们运行 ./junk.sh -p 时，我们应该只删除软链接本身还是也删除软链接指向的文件？

If the .junk folder contains a symlink, when we run ./junk.sh -p, should we delete only the symlink or also the file which the symlink links to?

我想分享这个我看了几次的 YouTube 频道，它涵盖了不同的 Bash 项目以及 Bash 语法/特性

https://youtube.com/ @yousuckatprogramming

I wanted to share this YouTube channel I've watched a couple times that covers different Bash projects and Bash syntax/features

https://youtube.com/@yousuckatprogramming

两个问题：

我在我的终端上运行了示例运行时场景，但是我还没有在 GitHub 上这样做。我应该在 GitHub 上运行它吗，如果应该，怎么运行？

我还在本地运行了拼写检查（这是额外要求部分的一部分），它是干净的，但当然，提交时没有证明。这重要吗？

two questions:

I have ran the sample run time scenario on my terminal, however, I haven't done this on GitHub. Should I run this on GitHub, and if so how?

I also ran spellcheck here (which is part of the additional requirements section) and it was clean, but of course, there is no proof of this when submitting. does this matter?

两个问题：

我在终端上运行了示例运行时场景，但尚未在 GitHub 上运行。我应该在 GitHub 上运行吗？如果应该，如何运行？

我还在这里运行了 spellcheck（这是附加要求的一部分），并且它是干净的，但当然，提交时没有证据。这重要吗？

two questions:

I have ran the sample run time scenario on my terminal, however, I haven't done this on GitHub. Should I run this on GitHub, and if so how?

I also ran spellcheck here (which is part of the additional requirements section) and it was clean, but of course, there is no proof of this when submitting. does this matter?

大家好，

请查看以下消息，如果感兴趣，请联系提供的电子邮件。

此致，

B 博士

---------------------------------------

残疾服务中心正在为您的课程寻找一名笔记员，要求其能坚持上课，并拥有整洁的手写笔记或打字笔记。该办公室正在寻找组织良好、详细且最能满足学生需求的笔记。

选定的笔记员将获得报酬：250 美元（每学期）

请注意以下资格标准：

• 如果您是哥伦比亚大学的在职全职员工，则没有资格被聘为笔记员。

• 如果您持有 A1 签证，则没有资格担任笔记员。

• 如果您是国际学生，则必须持有有效的 F1 签证和哥伦比亚大学签发的 I-20 表格才能被聘为笔记员。

如果您被选中，您需要将学期开始至最后一次上课的所有笔记与您的第一次提交一并提交。

有兴趣的学生必须填写随附的表格，并通过电子邮件将本课程的笔记样本（仅限 PDF 或 WORD 文件，不得为图片或 Jpeg 文件）发送至 odsnotes @columbia.edu。

将选择最能满足学生需求的笔记。

Hi all,

Please see the message below and reach out to the email provided if interested.

Best,

Dr. B

---------------------------------------

Disability Services is looking for a note-taker in your course who attends class consistently and has neat handwriting or typed notes. The office is looking for notes that are well organized, detailed and best meet the needs of the student(s).

The selected note-taker will be compensated for their services: $250 (for the semester)

Please note the following eligibility criteria:

• If you are a current full-time employee of Columbia University, you are not eligible to be hired as a note-taker.

• If you have a A1 visa, you are not eligible to be a note-taker

• If you are an international student, you must have a valid F1 visa AND I-20 form issued by Columbia University to be hired as a note-taker.

If you are selected, you will expected to submit all notes from the beginning of the semester up to the last class attended with your first submission.

Interested students must complete the attached form and send a sample set of notes (PDF or WORD only-no pictures or Jpeg files) from this course via email to odsnotes@columbia.edu.

The notes which best meet the student's needs will be selected.

大家好，

昨天下课后，有学生发现了 search.sh 的一个极端情况。

假设你在家目录的 Music 文件夹中创建一个指向 Music 文件夹父目录（即家目录本身）的软链接。

~/Music$ tree

.

└── up -> ..

2 directories, 0 files

[ -d "$file" ]` 和 `[ -h "$file" ] 都将返回 true。如果你递归进入这个特定的软链接，你将会有“无限”递归。

最简单的修复方法是根本不递归进入软链接。否则，我们必须跟踪所有访问过的目录，这很麻烦。

请看下面的更新：

#!/bin/bash

###############################################################################

Hi all,

After class yesterday, a student found an edge case for search.sh

Suppose you create a symlink in the Music folder in your home directory to point to the parent of the Music directory, which is indeed the home directory itself.

~/Music$ tree

.

└── up -> ..

2 directories, 0 files

Both [ -d "$file" ] and [ -h "$file" ] will return true. If you recurse into this specific symlink, you will have "infinite" recursion.

The easiest fix is to simply not recurse into symlinks. Otherwise, we'd have to keep track of every directory visited, which is cumbersome.

Take a look at the update below:

#!/bin/bash

###############################################################################

大家晚上好，

我写了一份关于如何设置 Visual Studio Code 以便与 Multipass 协同工作的指南。本质上，它允许你在 VS Code 中，在你的 Ubuntu 虚拟机上编写作业代码，这比使用 vim/nano 更容易。

它与其它指南位于同一仓库中：

https://github.com/cs3157-borowski/guides/blob/main/multipass_vscode.md

尽管本指南是为 macOS 上的 Multipass 编写的，但对于其他系统上的其他代码编辑器来说，步骤非常相似，只需稍作修改。

在尝试本指南之前，请务必先设置好 Multipass：

Multipass Setup.pdf

由于班级规模和 VS Code 服务器安装的开销，这在 BSB 服务器上将无法工作。

如有任何问题或需要澄清的地方，请随时在此处发帖。

Good evening all,

I've written a guide for setting up Visual Studio Code for working with Multipass. Essentially, it lets you write your homework code on your Ubuntu Virtual Machine on VS Code, which is easier than working with vim/nano.

It is in the same repository as the other guides:

https://github.com/cs3157-borowski/guides/blob/main/multipass_vscode.md

Although this guide is written for Multipass on macOS, the steps are very similar for other code editors on other systems, with some small changes.

Make sure to set up Multipass first before attempting this guide:

Multipass Setup.pdf

This will NOT work on the BSB server due to the size of the class and the overhead that the VS Code server installs.

Feel free to post here any questions or clarifications needed.

我正在设置 multipass，在说明中看到它将占用大量存储空间。我的机器上没有那么多可用空间，是否可以将其重定向到我的 SSD？我知道 multipass 的下载无法重定向，但对于虚拟机创建来说可以吗？

I was setting up multipass and I saw in the instructions the amount of storage it will take up. Is it possible to redirect it to my SSD since I don't have that much space free on my machine? I know the download of multipass can't be redirected, but for the vm creation.

您好，我想询问关于我们即将进行的考试中对 Bash 脚本的预期熟悉程度。

学生应该能够轻松地/从头开始实现我们大纲中提供的函数（例如 search.sh、parseargs.sh 等），还是仅仅对脚本的语法和整体行为有深入的理解就足够了？

我个人认为前者是理想的，但我只是想确认我们为在考试中取得好成绩所需的预期能力水平。

非常感谢您的帮助！

附：如果您认为值得分享，我绝对可以解除此帖的私有状态！

Hello, I would like to ask on the expected level of familiarity with bash scripting in terms of our upcoming exam(s).

Should students be able to implement the sort of functions we are provided with in the syllabus (search.sh, parseargs.sh, etc) with ease/from scratch, or is it sufficient to have a strong understanding of the syntax and overall behavior of the scripts?

I would think the former would be ideal, but I just wanted to confirm our expected level of ability to do well on the exams.

Thank you very much for your help!

p.s. I can definitely un-private this if you feel it's worth sharing!