by Jacob Evelyn

雅各布·伊夫林(Jacob Evelyn)

那个时候我不小心改写了Bash ... (That time I accidentally overwrote Bash… in Bash)

“我知道我在做什么。” (“I know what I’m doing.”)

Five years ago, a few weeks into my very first Programming Job™, I was tinkering around in bash trying to get some code to run.

五年前，也就是我第一次编程工作™的几周后，我在进行bash修改，试图运行一些代码。

I was becoming increasingly frustrated. Why wasn’t that file in my $PATH? It should have been, I felt certain of that.

我变得越来越沮丧。 为什么我的$PATH没有该文件？ 我本该确定应该的。

But, growing more and more desperate to get something to work, I moved the file to a folder I knew was in the $PATH:

但是，越来越大，越来越迫切希望得到的东西的工作，我搬到文件到我所知道的是在一个文件夹$PATH ：

> mv ./file.whatever /bin

At least, that’s what I meant to type. In reality what I typed was:

至少，这就是我想键入。 实际上，我键入的是：

> mv ./file.whatever /bin/bash

My employer-provided MacBook Pro yelled at me, like any good UNIX system:

我的雇主提供的MacBook Pro对我大叫，就像任何好的UNIX系统一样：

mv: rename ./file.whatever to /bin/bash: Operation not permitted

And like any good programmer, I blindly added a sudo and typed in my password as quickly as I could. Stupid computer, thinking it knows better than me.

像任何优秀的程序员一样，我盲目添加了sudo并尽快输入密码。 愚蠢的计算机，以为它比我更了解。

Having just unknowingly overwritten the very shell I was using, I was shocked to find my code still wouldn’t run.

在不知不觉中覆盖了我正在使用的外壳的情况下，我震惊地发现我的代码仍然无法运行。

“我不知道我在做什么，但是没关系。” (“I don’t know what I’m doing but it’s okay.”)

I opened a new OS X Terminal tab to try a new approach to getting my code running, and instead saw this:

我打开了一个新的OS X终端选项卡，尝试一种新方法来运行我的代码，但看到了以下内容：

> permission denied: ./file.whatever

[Process completed]

Hmm, that’s weird. Not sure why bash isn’t working, but at least it’s doing something with my file!

嗯，这很奇怪。 不知道为什么bash不起作用，但至少它对我的文件有作用！

I switched back to my previously-open bash shell and continued trying a few commands. They still worked, of course, because the bash program was already in memory at the time I overwrote its executable.

我切换回以前打开的bash shell，并继续尝试一些命令。 当然，它们仍然有效，因为在我重写可执行文件时， bash程序已经在内存中。

So some Terminal tabs aren’t working, but others are. Probably ghosts in the machines.

因此，某些终端选项卡不起作用，而其他选项卡则起作用。 机器中可能有鬼影。

To sort out this weird-but-definitely-probably-not-a-big-deal bash behavior I decided to do the tried-and-true cure-all: quit the app (Terminal) and open it again.

为了解决这种怪异但肯定不是大交易的bash行为，我决定进行尝试并真正解决所有问题：退出应用程序(终端)，然后再次打开它。

“天啊！ 我做了什么？” (“Oh god! what have I done?”)

Out of nowhere, the reality of what had happened hit me like a snowball to the face. Oh no oh no oh no I just overwrote Bash.

无处不在，发生的事情的现实像雪球一样击中了我。 哦，不，不，我只是重写了Bash。

I no longer cared about getting my code to run. All I wanted to do was go back to the way things were.

我不再关心让我的代码运行。 我要做的就是回到原来的样子。

“这可能是可以解决的……” (“This is probably fixable…”)

I spent a long time Googling things like “deleted bash” and “download new bash OS X” and got nowhere. I was in too much of a panic to think about using other shells — which I vaguely knew about, but didn’t realize were already installed on my machine. (And I certainly didn’t realize these shells were also usable by just changing a setting in the Terminal app. #facepalm)

我花了很长时间谷歌搜索诸如“删除bash”和“下载新bash OS X”之类的东西，却一无所获。 我实在太着急了，无法考虑使用其他外壳了-我隐约知道，但没有意识到已经安装在我的机器上了。 (而且我当然不知道仅通过在终端应用程序中更改设置即可使用这些shell。#facepalm)

Eventually, I sheepishly confessed to some coworkers what I had done and after we all had a good chuckle I got one of them to email me a copy of his bash program so I could manually move it back into the /bin folder in Finder. (Hooray for point-and-click interfaces!)

最终，我令人毛骨悚然地向一些同事坦白了我的所作所为，当所有人都欢呼雀跃之后，我让其中一个人通过电子邮件将他的bash程序的副本发送给我，以便我可以将其手动移回Finder中的/bin文件夹。 (万岁的点击界面！)

Except… Finder wouldn’t let me go to the /bin folder. OS X (that version of it, at least) hid /bin and other system folders it deemed unsafe for meddling users like me to see. Stupid computer, thinking it knows better than me.

除了…Finder不允许我进入/bin文件夹。 OS X(至少是该版本)隐藏了/bin和其他系统文件夹，对于像我这样的用户来说，这样做是不安全的。 愚蠢的计算机，以为它比我更了解。

So I Googled some more, this time for things like “view hidden folders in Finder.” I found a handful of different ways to do that, but every single one of them required me to type some magic command… into bash, which I could no longer open. Kids: if you delete your shell but have an instance of it open, don’t close it!

因此，我这次在Google中搜索了更多内容，例如“在Finder中查看隐藏的文件夹”。 我找到了几种不同的方法来执行此操作，但是每个方法都要求我在bash键入一些魔术命令…，我无法再打开它。 孩子们：如果删除外壳程序但打开了它的实例，请不要关闭它！

“好吧...这也许可以解决...” (“OK… this is maybe fixable…”)

At a loss for what to do next, I found an old internal Q&A system the company had and posted a quick description of my problem, trying to strike that balance in tone between heh what a funny but probably not uncommon situation, right everyone? and please someone anyone help me I’m panicking. The site looked like it wasn’t ever used anymore but I was hoping someone got an email when a question was posted.

不知所措，下一步我发现公司有一个旧的内部问答系统，并快速描述了我的问题，试图在两种有趣但可能不常见的情况之间取得平衡，对吗？ 请有人帮助我感到恐慌 。 该网站看起来好像已经不再使用了，但是我希望有人在发布问题时能收到电子邮件。

Lo and behold, my Hail Mary quickly got a response: someone recommended booting from a Linux Live CD (this was back when computers had CD drives), and then from within Linux accessing my OS X file system to add bash back to its rightful place. I understood about a third of the suggestion, but went ahead anyway — what other options did I have? I found a Linux CD, did a bunch of things I didn’t understand to get it to work, and waited impatiently as the machine went through all of the myriad setup steps until — voilà! A desktop appeared!

瞧，我的冰雹玛丽很快得到了回应：有人建议从Linux Live CD引导(这在计算机具有CD驱动器时返回)，然后从Linux内部访问我的OS X文件系统以将bash添加回其应有的位置。 。 我理解了大约三分之一的建议，但无论如何都继续进行-我还有什么其他选择？ 我找到了一张Linux CD，做了很多我不了解的事情才能使它正常工作，并且不耐烦地等待着机器经过所有无数的设置步骤，直到– 瞧！ 桌面出现了！

I Googled around until I found out how to mount the OS X filesystem, and eagerly opened bash (what a good feeling!) to copy that machine’s bash executable back over to OS X… only to encounter an error message: the OS X partition was read-only from Linux. I did find out about a way to make it writable, but that required restarting back in OS X and — you guessed it — running a command in bash.

我四处搜寻，直到我发现如何挂载OS X文件系统，然后急切地打开bash (感觉真好！)将那台机器的bash可执行文件复制回OS X……只是遇到一条错误消息：OS X分区是从Linux只读。 我确实找到了使它可写的方法，但是需要在OS X中重新启动，并且-您猜对了-在bash运行命令。

I tried a few different Linux Live CDs (each of which took about forty minutes of impatient pacing to boot), but each had the same result. Once again: if you delete your shell but have an instance of it open, don’t close it!

我尝试了几种不同的Linux Live CD(每张CD大约需要四十分钟不耐烦的节奏启动)，但是每张光盘都具有相同的结果。 再说一次：如果删除外壳程序但打开了它的实例， 请不要关闭它！

“无论如何，可修复甚至意味着什么？” (“What does fixable even mean anyway?”)

Unsure where to go from there, I reached out to coworkers again and eureka! — someone knew of a way to navigate to any folder — even hidden ones — within Finder. All I had to do was restart in OS X again, copy the emailed bash executable to /bin, and everything would be gravy. So I shut down Linux, removed the Live CD, restarted in OS X, and…

不确定从那里去哪里，我再次联系了同事， 尤里卡！ —有人知道在Finder中导航到任何文件夹(甚至是隐藏文件夹)的方法。 我要做的就是再次在OS X中重新启动，将通过电子邮件发送的bash可执行文件复制到/bin ，一切都会变得很糟。 所以我关闭Linux，取出Live CD，在OS X中重新启动，然后…

Hmm. I couldn’t log in, because, well, the OS X login process uses a shell under the hood, and guess which shell that is?

嗯 我无法登录，因为OS X的登录过程在幕后使用了一个外壳，然后猜测是哪个外壳？

Was I doomed to spend the rest of my career living off of Linux Live CDs? I pictured myself years in the future, a babbling hermit kept around to scare the new kids: “Don’t delete bash or you’ll end up like crazy old Jake.”

我是否注定要用Linux Live CD来度过余生？ 我对自己的未来进行了想象，一个a咕的隐士一直在吓着新来的孩子： “不要删除bash，否则您最终会像疯了的老杰克一样。”

“我从来没有更高兴看到错误消息” (“I’ve never been happier to see an error message”)

I had given up all hope, when another coworker (goodness, these people knew so much!) told me about single-user mode, a special OS X startup mode that helps you resolve login (and other) errors. Single-user mode let me boot a bare-bones, command-line version of OS X through a different shell (/bin/sh, I think). From there, it was just a matter of finding the right incantations to get the bash executable back into /bin and off of a USB drive (where I put it in another painfully slow iteration of the Linux Live CD boot).

当另一个同事(天哪，这些人知道很多！)告诉我有关单用户模式时 ，我已经放弃了所有希望，这是一种特殊的OS X启动模式，可以帮助您解决登录(和其他)错误。 单用户模式让我通过不同的外壳(我认为是/bin/sh )引导OS X的准系统命令行版本。 从那里开始，找到合适的方法将bash可执行文件放回/bin并从USB驱动器中移出(这是我将其放入Linux Live CD引导的另一个痛苦的缓慢迭代中)的问题。

Once that was done, I restarted the Mac and all was finally well again! Well, except that of course my code still didn’t run.

完成之后，我重新启动了Mac，一切终于恢复了！ 好吧，除了我的代码当然还没有运行。

翻译自: https://www.freecodecamp.org/news/i-accidentally-overwrote-bash-in-bash-e612da33da4b/