[Saiprabhu]

Basically there are three scripts, for example walk.sh, stand.sh and sleep.sh
and the walk.sh should not run when either stand.sh or sleep.sh is running.
for this I have put in walk.sh as below:
#!/bin/ksh

sleeppid=`ps -aef | grep -i "sleep.sh" | grep -v grep | awk '{print $2}'`
standpid=`ps -aef | grep -i "stand.sh" | grep -v grep | awk '{print $2}'`
if [ ${sleeppid} -gt 1 ] || [ ${standpid} -gt 1 ]
then
echo "sleep or stand process already started"
exit
else
echo "walk process can be started"
sleep 120

when I ran the walk.sh script I got below error message,
but when sleep or stand scripts are running, and when I tried to start
walk script I got correct message as "sleep or stand process already started"
I tried hard I did't able to correct this walk.sh script,
It is saying about test argument , which I dont understand
please help as early as possible:
=======================================
ksh -x walk.sh
+ + ps -aef
+ grep -i sleep.sh
+ awk {print $2}
+ grep -v grep
sleeppid=
+ + ps -aef
+ grep -i stand.sh
+ awk {print $2}
+ grep -v grep
standpid=23104
+ [ -gt 1 ]
walk.sh[5]: test: argument expected
+ [ 23104 -gt 1 ]
+ echo sleep or stand process already started
sleep or stand process already started
+ exit
==================================

[Squashman]

Is that the whole walk.sh. script? I would assume you need to close the IF statement. But I do not know if scripting in KSH is different from Bash. I have never used KSH.

if
fi

[Saiprabhu]

Originally Posted by LwdSquashman

Is that the whole walk.sh. script? I would assume you need to close the IF statement. But I do not know if scripting in KSH is different from Bash. I have never used KSH.

if
fi

Thanks a for fast response,
I closed the script with fi but I missed this while pasting this script into this thread , I don't think there will be much difference between ksh and bash with regard to below logic.

#!/bin/ksh

sleeppid=`ps -aef | grep -i "sleep.sh" | grep -v grep | awk '{print $2}'`
standpid=`ps -aef | grep -i "stand.sh" | grep -v grep | awk '{print $2}'`
if [ ${sleeppid} -gt 1 ] || [ ${standpid} -gt 1 ]
then
echo "sleep or stand process already started"
exit
else
echo "walk process can be started"
sleep 120
fi

[Squashman]

I think I know what the problem is. If sleeppid or standpid = blank because they are not running. The comparison is not made because the value of sleeppid or standpid is not an integer.

At the beginning of your script, try setting sleeppid and standpid to 0
sleeppid=0
standpid=0

[Squashman]

Got up this morning and realized that my previous post will not work either, but I was on the right track. You need to test if the script is running.

if ps -ef | grep "sleep.sh" | grep -v grep >/dev/null then
echo "sleep process already started"
exit
else
echo "walk process can be started"
sleep 120
fi