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Pretty much, the code is below. It is a part of my function collection for the bash.

####
# Replaces a string in all files in given path and below
# taken from: http://www.cyberciti.biz/faq/unix-linux-replace-string-words-in-many-files/
# taken from: http://stackoverflow.com/questions/4437901/find-and-replace-string-in-a-file
# taken from: http://stackoverflow.com/questions/7450324/how-do-i-replace-a-string-with-another-string-in-all-files-below-my-current-dir
#
# @author stev leibelt 
# @since 2013-7-30
####
function net_bazzline_replace_string_in_files ()
{
    if [[ $# -lt 3 ]]; then
        echo 'invalid number of arguments provided'
        echo 'command search replace fileextension [path]'
        return 1
    fi

    if [[ $# -eq 4 ]]; then
        find "$4" -name "*.$3" -type f -exec sed -i 's/'"$1"'/'"$2"'/g' {} \;
    else
        find . -name "*.$3" -type f -exec sed -i 's/'"$1"'/'"$2"'/g' {} \;
    fi
}