UNIX for Dummies Questions & Answers

KSH - I've got a script that is generating a number of log files like this:

y=`date +"%y"`
m=`date +"%m"`

$LOG_DIR/tuscprof_tbl_$y$m.log

I only want to keep the current 2 months' worth of files (current month and prior month). So I'm trying to come up with a way to delete any that contains a filename month that is -2 from current month.

I thought I could do it like this, but it's not working:

if [[ -e $LOG_DIR/*_$(($y))*.log && -e $LOG_DIR/*_*$(($m - 2)).log ]]
then rm $LOG_DIR/*_*$(($m - 2)).log
fi

if [[ -e $LOG_DIR/*_$(($y - 1))%*.log && ! $m -eq 01 ]]
then rm $LOG_DIR/*_$(($y - 1))%*.log
fi

find $LOG_DIR -name 'tuscprof_tbl_*.log' -mtime +60 -exec rm -f {} \;