Seach a word recursively in all files under the current working direcrtory

gistfile1.sh

#! /usr/bin/env bash

if [ $# -eq 0 ]
then
    echo "No word supplied"
fi

word=$1

find . -type f -and -not -path '*/.git/*' -and -not -path '*/.svn/*' -exec grep -i -H "$word" {} \;

Copy the file to a directory in your path, for example: references
chmod +x references

Usage:
references word_to_search

Example:

gallir@darwin:/tmp/linux-3.18.5$ references spin_unlock
./block/bio.c: spin_unlock(&bs->rescue_lock);
./block/bio.c: spin_unlock(&bs->rescue_lock);
./block/bio.c: spin_unlock_irqrestore(&bio_dirty_lock, flags);
./block/bio.c: spin_unlock_irqrestore(&bio_dirty_lock, flags);
./block/blk-cgroup.c: spin_unlock(&blkcg->lock);
....

PS: You can do it with grep -R... but I'm an old fan of find ;)