--- scripts/subtitles.orig	2020-05-15 23:32:25 UTC
+++ scripts/subtitles
@@ -1,4 +1,4 @@
-#! /bin/bash
+#! /bin/sh
 #
 # display teletext subtitles (PAL) in xawtv
 # required: alevt-cap, xawtv-remote
@@ -12,7 +12,7 @@ device="/dev/vbi0"
 ##########################################################################
 # helpers
 
-function usage() {
+usage() {
 cat <<EOF
 This script displays teletext subtitles within xawtv.
 It needs the alevt-cap and xawtv-remote utilities.