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Shell script works when executed from command line but not when using at or cron

Posted on 2006-11-13
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Last Modified: 2010-07-27
I am adding to an existing backup to tape script to resolve an error that occurs about once a month.
If I execute this script from the command line it works fine but when using at or cron it does not work.
Here is a tail -20 of the logfile I am reading from the script
=======================================
/data6/CNSPROD/arch/arch_CNSPROD_1_49179.arc.Z
/data6/CNSPROD/arch/arch_CNSPROD_1_49181.arc.Z
/data6/CNSPROD/arch/arch_CNSPROD_1_49183.arc.Z
/data6/CNSPROD/arch/arch_CNSPROD_1_49184.arc.Z
/data6/CNSPROD/arch/arch_CNSPROD_1_49189.arc.Z
/data6/CNSPROD/arch/arch_CNSPROD_1_49187.arc.Z
/data6/CNSPROD/arch/arch_CNSPROD_1_49191.arc.Z
/data6/CNSPROD/arch/
/data6/CNSPROD/
/data6/
/data7/
/

save: /  92 GB 03:21:33    137 files
Unmounted device: /dev/rmt/0n
End: 12/11/06 16:26
Unloading tape...
Error 117: Drive comm
Moving tape from slot 82 to slot 12...
Error 18: Source inside drive
=======================================
here is the new part of the script.
I cut the end of the script out for testing.
=======================================
##################################################################
# set -xv
#!/bin/ksh
#
DBA1='bkreynolds48@yahoo.com';export DBA1
PATH=$PATH:/usr/bin:/usr/sbin/:/sbin:/bin:/usr/opt/networker/bin; export PATH
#
LOGFILE=/data7/nsr/logs/sunday_cold_backup.111206; export LOGFILE
LG=/data7/nsr/lg; export LG
TP=`date "+%m-%d-%y"`;export TP
#
##################################################################
#
if  [[ "`tail -1 $LOGFILE`" = "Error 18: Source inside drive " ]];
then
   tail -2 $LOGFILE | /usr/bin/mailx -s "Tape ERRORS" $DBA1                >$LG 2>&1
    /usr/bin/touch /data7/nsr/verified_TPerrors.$TP
        echo TPerrors                                                                           >>$LG 2>&1
    /usr/bin/mailx -s "this is a test" $DBA1  <$LG                                   >>$LG 2>&1
    /usr/bin/touch /data7/nsr/verified_2NDtry.$TP
        echo 2NDtry                                                                             >>$LG 2>&1
   tail -2 $LOGFILE | /usr/bin/mailx -s "Tape ERRORS" $DBA1                >>$LG 2>&1
    /usr/bin/touch /data7/nsr/verified_TPerrors.$TP
    /usr/bin/mailx -s "this is a test 2- RETRY" $DBA1        <$LG              >>$LG 2>&1
#
else
   tail -5 $LOGFILE | /usr/bin/mailx -s "Cold Backup " $DBA1                >>$LG 2>&1
        echo NOerror                                                                          >>$LG 2>&1
   /usr/bin/mailx -s "this is a test 3" $DBA1      <$LG                           >>$LG 2>&1
    /usr/bin/touch /data7/nsr/verified_backup.$TP
fi
#
#
####################### End of Script #################################
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Question by:bkreynolds48
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10 Comments
 
LVL 58

Expert Comment

by:amit_g
Comment Utility
Use absolute path for every command. Even though you have set path in the script, you should use absolute paths. Do which commandname e.g. which date, which tail and use the path you get in the script.

Who is the owner of cron job? Does that user get an email when the cron job completes/fails?
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LVL 48

Expert Comment

by:Tintin
Comment Utility
You haven't defined what "does not work" means.

Do you not get an email?
Are the wrong results sent?
Do you get any relevant error messages?
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Assisted Solution

by:yuzh
yuzh earned 300 total points
Comment Utility
put
set -x

in your script, redirect the script output to a file when you use cron to run it, eg

30 10 * * * /path-to/yourscript >/tmp/output  2>&1

check tmp/output , or post it if you need more help.
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Author Comment

by:bkreynolds48
Comment Utility
What does not work from cron or at is that the script falls through to "NOerror" when it should see the tape error 18
I have tried using both "sh" and "ksh" shells

If you look at the script above you will see that I already have set -xv in it

Yuzh the is the output from the "tmp 2>&1" file
/data7/nsr/bk.test: [[: not found
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Accepted Solution

by:
Tintin earned 200 total points
Comment Utility
The error

/data7/nsr/bk.test: [[: not found

would only occur if you tried to run the script under sh rather than ksh, and the reason it runs under /bin/sh is that your she bang #! is incorrect.

You have:

##################################################################
# set -xv
#!/bin/ksh

When it should be

#!/bin/ksh
##################################################################
# set -xv


The #! line *needs* to be the very first line, otherwise it is ignored.  By default, all cronjobs run under /bin/sh
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Expert Comment

by:bpeterse
Comment Utility
Another point - albeit minor - is that when you're using Korn shell, you can export your variables directly, i.e.

DBA1='bkreynolds48@yahoo.com';export DBA1  

becomes

export DBA1='bkreynolds48@yahoo.com'

0
 
LVL 38

Assisted Solution

by:yuzh
yuzh earned 300 total points
Comment Utility
For ksh script, the first line always:
#!/bin/ksh

otherwise, you did n't specify what shell to be used for the script, and cron will use its default shell - sh syntax to run the statements in the script.
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Author Comment

by:bkreynolds48
Comment Utility
I put the set command after the
#!/bin/ksh
but still have the same results........
/data7/nsr/bk.test: [[: not found

Thanks
Bev
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Author Comment

by:bkreynolds48
Comment Utility
I changed
if  [[ "`tail -1 $LOGFILE`" = "Error 18: Source inside drive " ]];
to
if  [ "`tail -1 $LOGFILE`" = "Error 18: Source inside drive " ];

and it worked.

Thanks
0
 
LVL 48

Expert Comment

by:Tintin
Comment Utility
Did you ensure

#!/bin/ksh

was the *very* first line?

In your original code, you had

##############################

as the first line, so if you didn't remove that, that will explain why it was still running under /bin/sh
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