Shell Programming and Scripting

USER=`/usr/ucb/whoami`
CRONLOC=/var/spool/cron/crontabs
CRONCOMMFILE=/tmp/cron_comm_file.sh
CRONGREP=`crontab -l | grep sys_diag`


if [ "$CRONGREP" != "" ];
then
echo "Crontab already exists"
exit 
fi
#
# Create command file to create crontab file
#
# If command files already exists delete it
#
if [ -f $CRONCOMMFILE ]; then
  rm -f $CRONCOMMFILE
fi

CRONLINE="0 9 * * 1,3,5 /var/tmp/sys_diag -l -a -o `hostname` -C"
CRONLINE2="5 9 * * * /var/tmp/clean"

#
# Added commands into the file to create the crontab entry
#

echo "#!/bin/sh" >> $CRONCOMMFILE
echo "EDITOR=ed" >> $CRONCOMMFILE
echo "export EDITOR" >> $CRONCOMMFILE


echo "crontab -e $USER << EOF > /dev/null" >> $CRONCOMMFILE
echo "a" >> $CRONCOMMFILE
echo "$CRONLINE" >> $CRONCOMMFILE
echo "$CRONLINE2" >> $CRONCOMMFILE
echo "." >> $CRONCOMMFILE
echo "w" >> $CRONCOMMFILE
echo "q" >> $CRONCOMMFILE
echo "EOF" >> $CRONCOMMFILE

chmod 750 $CRONCOMMFILE

#
# Execute the the crontab command file
#
if [ -f $CRONCOMMFILE ]; then
  $CRONCOMMFILE
  rm $CRONCOMMFILE
else
  echo "Error: File generated to create crontab entry does not exist"
  exit 1
fi

echo "Crontab Entry Inserted Successfully"
#