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Can run a ".sh" script as the user but not from the crontab

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Top Forums Shell Programming and Scripting Can run a ".sh" script as the user but not from the crontab
# 8  
Old 09-10-2009
The Script is behaving wierdly
Thank you guys for all the suggestions. I put the full path and the script and now works good.

Quote:
Originally Posted by Vi-Curious
Another minor observation. This says run your script every hour on the half hour.
Yes, that is correct.

One thing I have noticed though is that the script is behaving weirdly and that the script is running "runapp.sh" even though it shouldn't.

I added one more line to my script to give me little more details in the log file. The new line is highlighted in bold letters.

Code:
#!/bin/ksh
m=`ps -ef | grep /install/new/application | wc -l`
if [ $m != 2 ]; then
echo "`ps -ef | grep /install/new/application`"
echo "starting application"
/install/new/runapp.sh
echo "done"
else
echo "no action taken";
fi

As you see the code says run "runapp.sh" only when the value of $m is not equal to 2. But I found that once in a while the script runs "runapp.sh" even though the value of m = 2. This happens some times and not always. Here are the excerpts from my log file.

Code:
no action taken
no action taken
no action taken
no action taken
 bhaire 22082     1  0   Sep 09 ?        4:58 /install/new/application
 bhaire 11402 11394  0 14:45:00 ?        0:00 grep /install/new/application
starting application
done
no action taken
no action taken

Shouldn't the value for "wc -l" be 2. But still why does it go and start "runapp.sh"?

Thanks in advance.
Last edited by bhaire; 09-10-2009 at 12:45 PM..
# 9  
Old 09-10-2009
Quote:
bhaire 22082 1 0 Sep 09 ? 4:58 /install/new/application
This process is a background process with a PPID of 1 . I suspect the the first "ps" in your script picked up the script or program which started the process "/install/new/application". That isn't in a cron as well is it?

There are other minor issues in the script. You are doing a text compare when a numeric compare would be better. There is a spurious semi-colon near the end of the script. Your highlighed line does not need the echo. Indentation makes scripts easier to follow.

Code:
#!/bin/ksh
m=`ps -ef | grep "/install/new/application" | wc -l`
if [ $m -ne 2 ]
then
	ps -ef | grep "/install/new/application"
	echo "starting application"
	/install/new/runapp.sh
	echo "done"
else
	echo "no action taken"
fi

If the user is always "bhaire", "ps -fubhaire" is more efficient than "ps -ef".
# 10  
Old 09-10-2009
Change the code to follows:
Code:
 #!/bin/ksh
m=`ps -ef | grep "/install/new/application" | grep -v grep`
if [ $? = 0 ]
then

# 11  
Old 09-14-2009
I made the code cleanup like Methyl suggested and it looks a lot better. I followed Edidataguy's suggestion and added grep -v grep and its working like a charm.

Thank you for all your help and suggestions.
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