Shell Programming and Scripting

#!/usr/bin/ksh
LOG_FILE=/GEM_PILOT/custom/script/cx_log
SERVER="${HOSTNAME}";
USER=`whoami`
CURRENT_PROCESS_ID=" ";

if [ -n "${SERVER})" ]
then
  while read LINE
  do
    if [ `echo ${LINE} | cut -c1` != "#" ]
    then
      DIR=`echo ${LINE} | cut -f1 -d"|"`;
      cd $DIR
      SCRIPTNAME=`echo ${LINE} | cut -f2 -d"|"`;
      ISEXECUTABLE=`echo ${LINE} | cut -f3 -d"|"`;
      DESC=`echo ${LINE} | cut -f4 -d"|"`;
    fi
    if [ -n "${SCRIPTNAME}" ]
    then
      CURRENT_PROCESS_ID=`ps -ef | grep "${SCRIPTNAME}" | grep -v grep | grep "${USER}" | grep "1" | tr -s ' ' ' ' | cut -c2- | cut -f2 -d" "`;
      if [ -z "$CURRENT_PROCESS_ID" ]
      then
        cd ${DIR}
        exec  $SCRIPTNAME;
        RET=$?;
        if [ "${RET}" -eq 0 ]
        then
           NEW_PROCSS_ID=`ps -ef | grep "${SCRIPTNAME}" |grep -v grep | grep "${USER}" | grep "1" |  tr -s ' ' ' ' | cut -c2- | cut -f2 -d ""`;
          if [ -z "$NEW_PROCSS_ID" ]
          then
            echo "$SCRIPTNAME has successfully started with ProcessID ${NEW_PROCESS_ID}" >> $LOG_FILE
        mailx -s "$USER instnce of $SCRIPTNAME restarted with ProcessID $NEW_PROCSS_ID" test@xyz.com
          fi
      fi
      fi
      echo "$SCRIPTNAME is already running with $CURRENT_PROCESS_ID SPID" >> ${LOG_FILE};
    fi
    done < /GEM_PILOT/custom/script/test.dat;
fi