问题描述
我有多个管道的命令，如下所示：
I have multiple piped commands, like this:
find [options] | grep [options] | xargs grep [options]
他们每个人都可能产生错误（错误的权限，空格，在文件名错误等），我不感兴趣。所以，我想重定向所有错误到/ dev / null的。我知道我可以用 2>的/ dev / null的，每个命令。我可以设置IO重定向持续？理想情况下，我只是将它设置一次，在命令的开始/结束，然后它会影响所有后续/ preceding管道命令。此外，可IO重定向被永久设置，以便它继续影响到的所有命令，直到它被复位？
Each one of them can potentially produce errors (permissions errors, spaces-in-filenames errors, etc) that I am not interested in. So, I want to redirect all errors to /dev/null. I know I can do this with 2>/dev/null, for each command. Can I set IO redirection persistently? Ideally, I would just set it once, at the beginning/end of the command, and then it would affect all subsequent/preceding piped commands. Also, can IO redirection be set permanently, so that it continues to affect all commands until it is reset?
我使用bash（我检查了手册页bash的内置命令，并没有看到'>'和'＆LT;'字在上方，所以我认为这是一个linux的东西...对不起）
I'm using bash (I checked the man page for bash builtins and did not see the '>' and '<' characters at the top, so I assumed it was a linux thing... sorry)
推荐答案
我要假设你正在使用bash，或者至少是某种类似Bourne外壳。
I'm going to assume that you're using bash, or at least some sort of Bourne-like shell.
我也假设你希望避免的是以下内容：
I'm also assuming that what you want to avoid is the following:
find ... 2>/dev/null | grep ... 2>/dev/null | xargs ... 2>/dev/null
即。重复 2＆gt;对管道中的每个环节的/ dev / null的部分
您可以做到这一点：
( find ... | grep ... | xargs ... ) 2>/dev/null
您还可以设置永久重定向如下：
You can also set the redirection permanently as follows:
exec 2>/dev/null
和（假设输出和错误进行了前两者指向同一个地方），你可以撤消与
and (assuming that STDOUT and STDERR were both pointing to the same place before), you can undo that with:
exec 2>&1
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