running scripts at background by order

[perez Ilan]

Hi all,

I'm trying to run a script that submit by many users. it is very important to keep the order (FIFO).
I tried the 'script | at now' and queuedefs 1j (only 1 job at a time). but when a few jobs send one after the other in short time, It does not keep the order.

any idea?
Thanks in advance,
Perez Ilan.

[Steven Sim Kok Leong · Accepted solution]

Hi,

At the beginning of your script, check whether other instances of your script are running and if they are, check the PID of these instances. At the end of your script run, check that all these PIDs have disappeared from the ps output before exiting.

Of my head (you need to test and refine):

#!/sbin/sh

PIDS=`ps -fae | grep my_script | grep -v grep | awk '{print $2}'`

... # whatever your script runs here

# Exit only when other instances have completed

pidlist=
for pid in `echo $PIDS`
do
pidlist="$pidlist -e $pid"
done

while sleep 5
do
if ! ps -fae | awk '{print $2}' | grep $pidlist >/dev/null 2>&1
then
# none of the forerunning processes are alive
exit
fi
done

Hope this helps. Regards.

Steven Sim Kok Leong

[Steven Sim Kok Leong]

Hi,

I forgot to consider the currently running script.

Change:

PIDS=`ps -fae | grep my_script | grep -v grep | awk '{print $2}'`

To:

PIDS=`ps -fae | grep my_script | grep -v grep | awk '{print $2}' | grep -v $$`

Hope this helps. Regards.

Steven Sim Kok Leong