Some env setting is causing the script not to work ?

Shell Programming and Scripting
1

Not sure what has changed in the Unix environment.
The following script which was working is now not working.

#!/usr/bin/ksh
# -----------------------------------------------------------------------------
# File:      monitor_db.sh
#
# -----------------------------------------------------------------------------
cd ~
. .profile

# Parameters used
# ORA_LOG,ORA_SCRIPT,DBA_EMAIL_LIST   -- (set in .profile)
#

cat $ORA_SCRIPT/orasid.lst | while read LINE1
do
  cat /etc/oratab | while read LINE
  do
  case $LINE in
  \#*)            ;;      #comment-line in oratab
  *)
  #       Proceed only if third field is 'Y'.
 if [ "`echo $LINE | awk -F: '{print $1}' -`" = $LINE1 ] ; then
 export ORACLE_SID=$LINE1
 export ORACLE_HOME=`echo $LINE | awk -F: '{print $2}' -`

#
# CHECK FOR ALL DB if Up/Down
#

  if [ -f $ORA_LOG/pmon_process_exist.txt ] ; then /bin/rm $ORA_LOG/pmon_process_exist.txt; fi
  ps -ef | grep ora_pmon_$ORACLE_SID | grep -v grep  > $ORA_LOG/pmon_process_exist.txt
  if [ -s $ORA_LOG/pmon_process_exist.txt ]
  then
        if [ -f $ORA_LOG/select.lst ] ; then /bin/rm $ORA_LOG/select.lst; fi
        $ORACLE_HOME/bin/sqlplus -s ora_connect/ora_connect@$ORACLE_SID @$ORA_SCRIPT/select.sql
        if [ -s $ORA_LOG/select.lst ]
        then
                echo "DB ALL OK"
        else
        for dba in `cat $ORA_SCRIPT/DBA_EMAIL_LIST`
        do
                /usr/bin/mailx -s "PMON is up but DATABASE HAS CONNECTIVITY ISSUES: $ORACLE_SID" $dba < /dev/null
        done
        fi
  else
    for dba in `cat $ORA_SCRIPT/DBA_EMAIL_LIST`
    do
        /usr/bin/mailx -s "DATABASE IS DOWN: $ORACLE_SID" $dba < /dev/null
    done
  fi
  rm $ORA_LOG/pmon_process_exist.txt
 fi
esac
done
echo $LINE1
echo $ORACLE_SID
echo $ORACLE_HOME
done

This is the culprit.

ps -ef | grep ora_pmon_$ORACLE_SID | grep -v grep  > $ORA_LOG/pmon_process_exist.txt

For some reason this is now generating an empty file thus making the logic fto ail and eventually the purpose of script. So even if the pmon process is not up it thinks it is since the file exist ? ANy idea of what have happened that all of a suddent the same script is not working ?

2 
ps -ef | grep ora_pmon_abc | grep -v grep
ps -ef | grep ora_pmon_abc | grep -v grep > abc
cat abc

An empty abc file was created ? don't know why...It was not the case before ?

ps -ef | grep ora_pmon_mdmop | grep -v grep
  oracle  6778     1  0  Mar  1  ?         0:19 ora_pmon_mdmop
ps -ef | grep ora_pmon_mdmop | grep -v grep > abc
cat abc
  oracle  6778     1  0  Mar  1  ?         0:19 ora_pmon_mdmop