bash 如何防止 rm 报告找不到文件？
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How to prevent rm from reporting that a file was not found?
提问by Village
I am using rmwithin a BASH script to delete many files. Sometimes the files are not present, so it reports many errors. I do not need this message. I have searched the man page for a command to make rmquiet, but the only option I found is -f, which from the description, "ignore nonexistent files, never prompt", seems to be the right choice, but the name does not seem to fit, so I am concerned it might have unintended consequences.
我rm在 BASH 脚本中使用来删除许多文件。有时文件不存在，因此它会报告许多错误。我不需要这个消息。我在手册页中搜索了一个命令来使rm安静，但我找到的唯一选项是-f，从描述中，“忽略不存在的文件，从不提示”，似乎是正确的选择，但名称似乎不合适，所以我担心它可能会产生意想不到的后果。
- Is the
-foption the correct way to silencerm? Why isn't it called-q? - Does this option do anything else?
- 该
-f选项是沉默的正确方法rm吗？为什么不叫-q？ - 这个选项还有其他作用吗？
回答by chepner
The main use of -fis to force the removal of files that would
not be removed using rmby itself (as a special case, it "removes"
non-existent files, thus suppressing the error message).
的主要用途-f是强制删除不会被rm自己删除的文件（作为一种特殊情况，它“删除”不存在的文件，从而抑制错误消息）。
You can also just redirect the error message using
您也可以使用重定向错误消息
$ rm file.txt 2> /dev/null
(or your operating system's equivalent). You can check the value of $?immediately after calling rmto see if a file was actually removed or not.
（或您的操作系统的等价物）。您可以$?在调用后立即检查 的值，rm以查看文件是否被实际删除。
回答by Satya
Yes, -fis the most suitable option for this.
是的，这-f是最合适的选择。
回答by technosaurus
-f is the correct flag, but for the test operator, not rm
-f 是正确的标志，但对于测试操作员，而不是 rm
[ -f "$THEFILE" ] && rm "$THEFILE"
this ensures that the file exists and is a regular file (not a directory, device node etc...)
这确保文件存在并且是一个常规文件（不是目录、设备节点等...）
回答by vimdude
\rm -f filewill never report not found.
\rm -f file永远不会报告找不到。
回答by Idelic
As far as rm -fdoing "anything else", it does force (-fis shorthand for --force) silent removal in situations where rmwould otherwise ask you for confirmation. For example, when trying to remove a file not writable by you from a directory that is writable by you.
至于rm -f做“其他任何事情”，它确实会在要求您确认的情况下强制（-f是--force）静默删除rm。例如，尝试从您可写的目录中删除您不可写的文件时。
回答by Niranjan
I had same issue for cshell. The only solution I had was to create a dummy file that matched pattern before "rm" in my script.
我对 cshell 有同样的问题。我唯一的解决方案是在我的脚本中创建一个与“rm”之前的模式匹配的虚拟文件。
