Shell Programming and Scripting

  #!/bin/bash
  #
  PASSWORD_FILE=/etc/passwd
  PASS_LOG=/tmp/cleanup.log
  #
  rm -f $PASS_LOG && touch $PASS_LOG
  #
  #
  #
  Isql –uHIDE –pwhatever –sprod –w 10 <<EOF >> /tmp/userlist
  Set nocount on
  Select name from db_workers where work is null
  Go
  Eof
  #
  for NAME in $(cut -d: -f1 "$PASSWORD_FILE" )
  do
   passwd -S $NAME | grep "PS" >/dev/null
   STATUS=$?
  if [ $STATUS -eq 0  ] ; then
  grep -i "$NAME" /tmp/userlist >/dev/null
  STATUS2=$?
  echo $STATUS2
  if [ $STATUS2 -eq 1 ] ; then
  echo $NAME >> $PASS_LOG
  fi
  fi
  done

#!/usr/bin/bash
 
comm -23 <<(
  sed '...' /etc/passwd | sort -u
 ) <<(
  db_query_bits | sed '...' | sort -u
 ) | while read extra_id
 do
  ...
 done