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How to run a shell script using cron and at

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I was trying to learn about crontab. I tried to execute shell script using crontab. But I did not get the expected result.
When I use crontab,

38 17 * * * bin/sh sh /home/agalya/unix/digiclock.sh

I can’t execute the shell script.

when I use ‘at’ command also I did not get the output.I have a doubt whether I have given the path of shell script correctly.How should I give the path?

~$ at 17:25
warning: commands will be executed using /bin/sh
at> /bin/sh sh /unix/digiclock.sh
at> <EOT>
job 9 at Sat Feb 20 17:25:00 2016

I am sure that the file has executable permission.


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