Shell Programming and Scripting

grep ^prmAttunityUser= djpHewr2XFMAttunitySetup_ae1_tmp
djpHewr2XFMAttunitySetup_ae1_tmp is a temporary file in which the user value is stored but this command in the script returns me balnk value whereas it has a value.

for y in $params; do
       for pf in $parfile; do
          ret=`grep \^$y\= $pf`
          if [ "$ret" != "" ]; then
             prm=$ret
          fi
       done
       if [ "$prm" == "" ]; then
          echo "parameter not found ($y) for job ($x.$invocation_id)"
          echo "Returning value 1"
          return 1
          exit
       else
          prmString[$cnt]="${prmString[$cnt]}  -param $prm"
       fi
    done