helm/bin/replace

#!/usr/bin/env bash
#
# Find and replace by a given list of files.
#
# replace foo bar **/*.rb

find_this="$1"; shift
replace_with="$1"; shift

items=( $(ag -l --nocolor "$find_this" "$@") )
for item in ${items[@]}; do
  sed -i "s/${find_this}/${replace_with}/g" "$item"
done