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Old 12-01-2012, 12:18 PM   #1
Srinivas Gadi
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Registered: Dec 2012
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Crontab is giving different result when execute the script on terminal

Hi All

I wonder when I execute the below command on terminal

SFILE=$(ls -lrt /auto/Gtl-Techmate/gtlnetwork/Techmate/Data/ | tail -2 | head -1 | awk -F " " '{print $8}')
echo $SFILE


If i put the same in a script and execute through crontab,been receiving a mail with the output "06:32" rather than "Atlas_Tool_Error_Report_30_Nov.csv"

i don't have any clue why it is happening like this,is there any thing wrong with my crontab, please suggest
Old 12-01-2012, 01:42 PM   #2
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The process environment under cron will almost certainly differ from the process environment of an interactive user.
For starters, it is very common for the ls command to be aliased in shell startup scripts, so relying on the format of it's output is a recipe for failure and instability. You seem to rely on the order of sorting in it's output, and using that to extract a positional element of it's output. The existence of any file that breaks that condition will break your code (and that may be what you're seeing here). You need to find a more rigorous way of characterizing the component of interest. It looks like you are trying to detect a filename based on a date. Composing the filename using specified formatting from the date command might be a better idea. If you need to extract information about that file, then parsing the output of stat will probably give you more consistent results.
Setting environment variables in your script so that they explicitly duplicate the condition of your development shell will probably go a long way toward solving your problem.

--- rod.
Old 12-03-2012, 02:08 PM   #3
Srinivas Gadi
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Thank you for your advice, got a date logic to fulfill my request
Old 12-28-2012, 02:51 PM   #4
Srinivas Gadi
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Registered: Dec 2012
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Have a one more question.

Please refer my code
while read line
echo "$i:$line";ssh $line 'nvidia-smi |grep -i MB | cut -c40-55'
let i++
done < ~/hostnames

There are ~100 server , i want remotely loginto all servers one by one and get the nvidia details, when i execute the above scrips it just fetch the details from one server post it quite, it does not heading to second server listed in hostnames file.

Please correct where i was wrong and wt should i do to fulfill my request


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