pid28796 is the program i launched, and the lower two are forked as child processes. the number of child process is 2-4.
I definitely sure that there is no "fork" in my script, as such issue is there even if i only keep this command in it. And ptree can never show the detail about it
does anyone know why there are multiple instances?
thanks in adv.
Last edited by Scott; 03-21-2011 at 12:17 PM..
Reason: Code tags, please...
Could you tell us a little more, such as which operating system and any more about the script you are look for. Different operaing systems have variations on the ps command and it would be worth seeing the script to look for anything that might cause child processes.
ps in itself should not cause your script to spawn processes, but it may find itself which can be random depending on how the process gets scheduled in by the OS e.g.
Probably better off using a lockfile with the process ID in it.
Code:
LOCK=/var/run/myscript.pid
# Test if lock file already exists and
# Send process NULL signal to test if it's running
# if so exit - cause job is already running
[ -e $LOCK ] && kill -0 `cat $LOCK` 2> /dev/null && exit 2
# Cleanup lockfile on exit, interrupt, quit or terminate
trap "{ rm -f $LOCK ; exit ; }" 0 2 3 15
echo $$ > $LOCK
# Rest of your script here
Last edited by Chubler_XL; 03-21-2011 at 10:10 PM..
This User Gave Thanks to Chubler_XL For This Post:
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will child processes be created when executing "ps"?
