#!/bin/bash
if test $# -lt 2
then
        echo "usage: `basename $0` <string> <dir1> [<dir2>...]" \
         " [<--> [<grep additional options>...]]" 1>&2
        exit 1
fi
str="$1" && shift
declare -a dir
i=0
while test "x$1" != "x"
do
        test "x$1" == "x--" && { shift; break; }
        test -d "$1" || { 
                echo "`basename $0`: $1: no such directory" 1>&2
                exit 1
        }
        dir[$i]="$1" && shift
        i=$((i+1))
done
j=0
while test $j -lt $i
do
        d="${dir[$j]}"
        case $d in
        -*) d="./$d";;
        esac
        find "$d" -type f -print0 | xargs -0 grep "$@" -- "$str"
        j=$((j+1))
done
exit 0