在 bash 脚本中临时重定向 stderr
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Temporary redirection of stderr in a bash script
提问by Karl Yngve Lerv?g
I have a simple script which is used to start another program. This other program may sometimes yield a SIGSEGV, which disrupts my output. I have therefore added a couple of lines which is supposed to temporarily redirect the stderrto /dev/nullsuch that the SIGSEGVis ignored. The following is a draft of my code:
我有一个简单的脚本，用于启动另一个程序。这个其他程序有时可能会产生一个SIGSEGV，这会破坏我的输出。因此，我增加了几个这是应该暂时重定向线stderr，以/dev/null使得SIGSEGV被忽略。以下是我的代码草稿：
exec 2> /dev/null
progname >& ./tmp/run.txt && run_status='OK'
exec 2>1
The problem is that the last line does not do what I want. The first line obviously works, and redirects the stderr. The last line is supposed to return the stderrback to where it was before (which I have only supposed is the same as stdout).
问题是最后一行没有做我想要的。第一行显然有效，并将stderr. 最后一行应该返回stderr到它之前的位置（我只假设它与 相同stdout）。
Any help would be appriciated!
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回答by Magnus Hiie
Another option is:
另一种选择是：
exec 3> /dev/stderr 2> /dev/null
progname >& ./tmp/run.txt && run_status='OK'
exec 2>&3
Or even
甚至
exec 3>&2 2> /dev/null
progname >& ./tmp/run.txt && run_status='OK'
exec 2>&3
That way the script preserves the separation of stdout and stderr for the script (ie. the scripts stdout and stderr can be redirected separately.
这样脚本就保留了脚本的 stdout 和 stderr 的分离（即脚本 stdout 和 stderr 可以单独重定向。
回答by Paul Tomblin
Why not just redirect it for the progname run only?
为什么不只针对 progname 运行重定向它？
progname > ./tmp/run.txt 2>/dev/null && run_status='OK'
Or possibly
或者可能
{
progname > ./tmp/run.txt && run_status='OK'
} 2>/dev/null
