Check processes

#!/bin/bash
function check_pgrep()
{
for PROC in $PROCS
do
 PROCID=$(pgrep -x $PROC | head -1)
 if test -z "$PROCID"
  then
  ERRLIST="$ERRLIST $PROC"
  fi
done
if [[ -n $ERRLIST ]]
then
 echo "MISSING:$ERRLIST"
 exit 2
else
 echo "OK: $PROCS"
fi
}

test "$#" -ne "2" && { echo not enough arguments ; exit 1 ; }
while getopts p: opt
do
   case $opt in
       p) PROCS=$OPTARG;;
       ?) echo "USAGE: $0 -p PROC"; exit 2 ;;
   esac
done

if test -n "$PROCS"
then
check_pgrep
else
echo "no proc argument"
exit 1
fi