if clause with grep and word count

Meert · #1 (**permalink**) 03-10-2009

I've got following script that I thought would only email me when the if clause finds the grep. But it emails me anyway (with an empty file) even if the grep doesn't return anything.

What should the line be?

Code:

if [ "`grep -l 'unique constraint' $LOGDIR/archive_active* | wc -l`" > "0" ]
then grep -l 'unique constraint' $LOGDIR/archive_active* > $LOGDIR/archive_error.lis
mailx -s "Archive_active logging contains unique constraints - ACTION REQUIRED" john@doe.com <<EOF
`cat $LOGDIR/archive_error.lis`
EOF
fi

thanks in advance.

regards, Meert

vgersh99 · #2 (**permalink**) 03-10-2009

use '-gt' instead of '>' for the algebraic comparison.

You could also use '-c' (instead of '-l') for grep and avoid piping to 'wc' - 'man grep'

jim mcnamara · #3 (**permalink**) 03-10-2009

Try this:

Code:

 grep -q 'unique constraint' $LOGDIR/archive_active* && \
   grep -l 'unique constraint' $LOGDIR/archive_active*  |
   mailx -s "Archive_active logging contains unique constraints - ACTION REQUIRED" \ 
       john@doe.com

Meert · #4 (**permalink**) 03-11-2009

Thanks!

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