Bash：当有 CTRL-C 时如何中断这个脚本？
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Bash: how to interrupt this script when there's a CTRL-C?
提问by SyntaxT3rr0r
I wrote a tiny Bash script to find all the Mercurial changesets (starting from the tip) that contains the string passed in argument:
我编写了一个很小的 Bash 脚本来查找包含传入参数的字符串的所有 Mercurial 变更集（从提示开始）：
#!/bin/bash
CNT=$(hg tip | awk '{ print }' | head -c 3)
while [ $CNT -gt 0 ]
do
echo rev $CNT
hg log -v -r$CNT | grep
let CNT=CNT-1
done
If I interrupt it by hitting ctrl-c, more often than not the command currently executed is "hg log" and it's that command that gets interrupted, but then my script continues.
如果我通过按 ctrl-c 来中断它，则当前执行的命令通常是“hg log”并且该命令被中断，但随后我的脚本会继续。
I was then thinking of checking the return status of "hg log", but because I'm piping it into grep I'm not too sure as to how to go about it...
我当时正在考虑检查“hg log”的返回状态，但是因为我正在将它传送到 grep 我不太确定如何去做......
How should I go about exiting this script when it is interrupted? (btw I don't know if that script is good at all for what I want to do but it does the job and anyway I'm interested in the "interrupted" issue)
当脚本被中断时，我应该如何退出这个脚本？（顺便说一句，我不知道该脚本是否适合我想做的事情，但它可以完成工作，无论如何我对“中断”问题很感兴趣）
采纳答案by Dan Story
Rewrite your script like this, using the $PIPESTATUS array to check for a failure:
像这样重写你的脚本，使用 $PIPESTATUS 数组来检查失败：
#!/bin/bash
CNT=$(hg tip | awk '{ print }' | head -c 3)
while [ $CNT -gt 0 ]
do
echo rev $CNT
hg log -v -r$CNT | grep
if [ 0 -ne ${PIPESTATUS[0]} ] ; then
echo hg failed
exit
fi
let CNT=CNT-1
done
回答by Arkku
Place at the beginning of your script: trap 'echo interrupted; exit' INT
放在脚本的开头： trap 'echo interrupted; exit' INT
Edit:As noted in comments below, probably doesn't work for the OP's program due to the pipe. The $PIPESTATUSsolution works, but it might be simpler to set the script to exit if any program in the pipe exits with an error status: set -e -o pipefail
编辑：正如下面的评论中所指出的，由于管道的原因，可能不适用于 OP 的程序。该$PIPESTATUS解决方案有效，但如果管道中的任何程序退出并显示错误状态，则将脚本设置为退出可能更简单：set -e -o pipefail
回答by Ignacio Vazquez-Abrams
The $PIPESTATUSvariable will allow you to check the results of every member of the pipe.
该$PIPESTATUS变量将允许您检查管道的每个成员的结果。
