diff --git a/bin/replace b/bin/replace
new file mode 100755
index 00000000..1601829b
--- /dev/null
+++ b/bin/replace
@@ -0,0 +1,14 @@
+#!/bin/sh
+#
+# 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 "$find_this" "$@")
+temp="${TMPDIR:-/tmp}/replace_tmp.$$"
+for item in $items; do
+  sed "s/$find_this/$replace_with/g" "$item" > "$temp" && mv "$temp" "$item"
+done