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BASH Script

Posted on 2004-09-10
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Last Modified: 2013-12-17
Hello:

I know nothing about bash scripting and need help compiling a script that would automate the  following. (Red-Hat 9)

1. execute a script that we already have in place have in place that analyzes our maillog
2. after the script executes - output to a file...lets say maillog_analysis
3. email that file to admin.
4. I would set this up as a cron job to run at periodic intervals.

Is this possible without too much difficulty.
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Question by:jstansley
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jlevie earned 125 total points
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If I understand your question correctly you'd need a script along the lines of:

#!/bin/sh
#
# Be nice and set a Subject and From in the mail we'll send to admin
#
host=`hostname`
cat >/tmp/maillog_analysis <<EOF
Subject: Mail Log Analysis
From: root@$host

EOF
#
# Execute the maillog analyser script and append the output to /tmp/maillog_analysis
#
/path-to/analyzer >>/tmp/maillog_analysis
#
# Mail the result to the admin account
#
/usr/sbin/sendmail -f root admin </tmp/maillog_analysis
exit

Save that to file (say /usr/local/sbin/do-maillog), edit it to set /path-to/analyzer to the path and name of your script, make it executable (chmod 755 /usr/sbin/do-maillog), and then add a crontab entry via 'crontab -e' as root like:

0 1 * * * /usr/local/sbin/do-maillog
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by:jstansley
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Thanks....I'll give this a try and see ifit flies.  Appreciate the help
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by:jstansley
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When I execute the file with ./maillogstats.............I get this
: bad interpreter: No such file or directory

Doing something wrong obviously...can you point it out?

Thanks
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by:jstansley
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This may help diagnose the problem.

If I just run bash <filename> it works
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by:jlevie
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": bad interpreter: No such file or directory" sounds like the magic line at the beginning of the script isn't exactly "#!/bin/sh". That line must have no leading or trailing whitespace and must end on only a Unix newline character. If you saved/wrote the script on a windows box and copied it to the server there'll b a carriage return on the line and it won't work.
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by:jstansley
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That did it...odd thing now is that the script runs fine from command line but not when set to run as a CRON. Very frustrating.  Here' what the CRON looks like

Thanks for your help

Last login: Sun Sep 12 08:33:51 2004 from host-24-225-238-137.patmedia.net
[root@SMM02 root]# crontab -e


30,59 * * * 1-7 /root/maillogstats
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by:jlevie
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If a root job fails it will mail the error report to the owner of the crontab (root in this case). Have you checked root's mail to see what the error is?
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by:jstansley
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You have been a tremendous help with this. Thanks. I found that it cannot find open sendmail to mail the results. It is just odd that I can run it manually and not via CRON. I am just getting my feet wet so to speak with LINUX and it's like learning a new language. Thanks again. Now let me see if I can get the script to run via CRON.
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