#!/bin/bash
name=$0
ext=''
path=.
GREP=/bin/grep

function usage () {
   cat <<EOF
Usage: `basename $0` [-d directory] [-e extension] pattern
EOF
   exit 0
}

while getopts "d:e:" opt; do
   case $opt in
       d )  path=$OPTARG ;;
       e )  ext=$OPTARG;;
       \?)  usage ;;
   esac
done

shift $(($OPTIND-1))
if [ $# -ne 1 ]; then
    usage
fi

for i in $path/*$ext; do
    output=$($GREP -n -F -- "$1" "$i")
    retval=$?
    if [ $retval == 0 ]; then
        found=true
        if [ $TERM == "dumb" ]; then
            echo -e "$i:\n$output\n"
        else
            echo -e "\033[1m$i:\033[0m\n$output\n"
        fi
    fi
done

if [ -z $found ]; then
    echo "$1 was not found in any of the files"
fi