I wrote a tiny Bash script to find all the Mercurial changesets (starting from the tip) that contains the string passed in argument:
#!/bin/bash
CNT=$(hg tip | awk '{ print $2 }' | head -c 3)
while [ $CNT -gt 0 ]
do
echo rev $CNT
hg log -v -r$CNT | grep $1
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.
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...
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)
Place at the beginning of your script: trap 'echo interrupted; exit' INT
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 $PIPESTATUS
solution 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
Rewrite your script like this, using the $PIPESTATUS array to check for a failure:
#!/bin/bash
CNT=$(hg tip | awk '{ print $2 }' | head -c 3)
while [ $CNT -gt 0 ]
do
echo rev $CNT
hg log -v -r$CNT | grep $1
if [ 0 -ne ${PIPESTATUS[0]} ] ; then
echo hg failed
exit
fi
let CNT=CNT-1
done
$PIPESTATUS
变量将允许您检查管道的每个成员的结果。
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