findで拡張子を指定してgrepするコマンド

sch.sh

#!/bin/sh
DEFAULT_FILES="html erb slim haml css scss sass js coffee rb rake yml"

usage_msg() {
  echo "usage: `basename $0` grep_text [find_files]"
  echo "(example) `basename $0` current_user erb slim"
}

### error check & init
case $# in
  0 ) # param none
    usage_msg
    exit 1
    ;;
  1 ) # set default params
    set -- ${1} ${DEFAULT_FILES}
    ;;
  * )
    ;;
esac

### build params
TARGET_TEXT=$1
extensions="-type f -name *.${2}"
shift
while [ "$2" != "" ]; do
  extensions="${extensions} -o -type f -name *.${2}"
  shift
done

### execute
find . ${extensions} | xargs egrep -n --color=always ${TARGET_TEXT}
exit 0