cs wrote:
I thought I'd worked out how to ensure only 1 instance of a shell script
was running (using grep and wc) but I now see that sometimes the script
name appears twice in the list of processes - any ideas?
eg (apols for wrapping) when running /home/michael/bin/backup-rsync-VERI
we get the below where it appears twice in the list of processes...
++ mktemp /tmp/chk_procs_XXX
+ TEMPFILE=/tmp/chk_procs_220
+ trap 'date|mail -s "$0 error" [EMAIL PROTECTED];echo Error
- aborting; exit' ERR
+ ps -elf
+ grep /home/michael/bin/backup-rsync-VERI
+ grep -v grep
+ tee /tmp/chk_procs_220
4 R michael 20219 20218 0 83 0 - 1020 - 18:18 ?
00:00:00 /bin/bash -x /home/michael/bin/backup-rsync-VERI
1 R michael 20223 20219 0 83 0 - 1020 - 18:18 ?
00:00:00 /bin/bash -x /home/michael/bin/backup-rsync-VERI
++ cat /tmp/chk_procs_220
++ wc -l
+ [[ 2 -gt 1 ]]
+ date
++ hostname -s
+ mail -s 'ratty /home/michael/bin/backup-rsync-VERI - already running'
[EMAIL PROTECTED]
+ rm /tmp/chk_procs_220
+ exit -1
This is what I do in situations like this:
#!/bin/sh
#get pid
PID=$$
#check to see if a previous process is running
if [ -e /var/run/sync.check ] ; then
if ps -p `cat /var/run/sync.check` >> /dev/null 2>&1 ; then
echo "Sync process already running, exiting"
exit 1
fi
fi
#write out pid
echo $PID > /var/run/sync.check
#do stuff
#end of script, remove pid file
rm -f /var/run/sync.check
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