diff --git a/scripts/termux-api-start.in b/scripts/termux-api-start.in
index f06d91d..b4b4311 100644
--- a/scripts/termux-api-start.in
+++ b/scripts/termux-api-start.in
@@ -1,2 +1,4 @@
 #!@TERMUX_PREFIX@/bin/sh
+# shellcheck shell=bash
+
 am startservice -n com.termux.api/.KeepAliveService
diff --git a/scripts/termux-api-stop.in b/scripts/termux-api-stop.in
index cf23769..6f66c9d 100644
--- a/scripts/termux-api-stop.in
+++ b/scripts/termux-api-stop.in
@@ -1,2 +1,4 @@
 #!@TERMUX_PREFIX@/bin/sh
+# shellcheck shell=bash
+
 am stopservice -n com.termux.api/.KeepAliveService
diff --git a/scripts/termux-audio-info.in b/scripts/termux-audio-info.in
index 5add06f..eab7d2c 100644
--- a/scripts/termux-audio-info.in
+++ b/scripts/termux-audio-info.in
@@ -1,4 +1,6 @@
 #!@TERMUX_PREFIX@/bin/sh
+# shellcheck shell=bash
+
 set -e -u
 
 SCRIPTNAME=termux-audio-info
diff --git a/scripts/termux-battery-status.in b/scripts/termux-battery-status.in
index 919535a..66dc483 100644
--- a/scripts/termux-battery-status.in
+++ b/scripts/termux-battery-status.in
@@ -1,18 +1,27 @@
 #!@TERMUX_PREFIX@/bin/sh
+# shellcheck shell=bash
+
 set -e -u
 
 SCRIPTNAME=termux-battery-status
 show_usage () {
-    echo "Usage: $SCRIPTNAME"
-    echo "Get the status of the device battery."
+    RESET='\e[0m'
+    LABEL='\e[96m'
+
+    echo -e "${LABEL}Usage${RESET}: $SCRIPTNAME
+Get the status of the device battery."
     exit 0
 }
 
+specification=:h
+option_names_as_string="$(echo "$specification" | sed 's/://g' | sed -r 's/(.)/ -\1/g')"
+read -r -a option_names_as_array <<< "$option_names_as_string"
+
 while getopts :h option
 do
     case "$option" in
         h) show_usage;;
-        ?) echo "$SCRIPTNAME: illegal option -$OPTARG"; exit 1;
+        ?) echo "$SCRIPTNAME: illegal option -$OPTARG, expected one of ${option_names_as_array[*]}"; exit 1;
     esac
 done
 shift $((OPTIND-1))
diff --git a/scripts/termux-camera-info.in b/scripts/termux-camera-info.in
index 32fcbd9..64d0f1a 100644
--- a/scripts/termux-camera-info.in
+++ b/scripts/termux-camera-info.in
@@ -1,4 +1,6 @@
 #!@TERMUX_PREFIX@/bin/sh
+# shellcheck shell=bash
+
 set -e -u
 
 SCRIPTNAME=termux-camera-info
diff --git a/scripts/termux-camera-photo.in b/scripts/termux-camera-photo.in
index 62d5751..1a39e60 100644
--- a/scripts/termux-camera-photo.in
+++ b/scripts/termux-camera-photo.in
@@ -1,4 +1,6 @@
 #!@TERMUX_PREFIX@/bin/sh
+# shellcheck shell=bash
+
 set -e -u
 
 SCRIPTNAME=termux-camera-photo
diff --git a/scripts/termux-clipboard-get.in b/scripts/termux-clipboard-get.in
index 24b9f35..b88d3c8 100644
--- a/scripts/termux-clipboard-get.in
+++ b/scripts/termux-clipboard-get.in
@@ -1,4 +1,6 @@
 #!@TERMUX_PREFIX@/bin/sh
+# shellcheck shell=bash
+
 set -e -u
 
 SCRIPTNAME=termux-clipboard-get
diff --git a/scripts/termux-clipboard-set.in b/scripts/termux-clipboard-set.in
index c401a7f..69f11c4 100644
--- a/scripts/termux-clipboard-set.in
+++ b/scripts/termux-clipboard-set.in
@@ -1,4 +1,6 @@
 #!@TERMUX_PREFIX@/bin/sh
+# shellcheck shell=bash
+
 set -e -u
 
 SCRIPTNAME=termux-clipboard-set
diff --git a/scripts/termux-contact-list.in b/scripts/termux-contact-list.in
index 90b1024..1843526 100644
--- a/scripts/termux-contact-list.in
+++ b/scripts/termux-contact-list.in
@@ -1,4 +1,6 @@
 #!@TERMUX_PREFIX@/bin/sh
+# shellcheck shell=bash
+
 set -e -u
 
 SCRIPTNAME=termux-contact-list
diff --git a/scripts/termux-download.in b/scripts/termux-download.in
index 83da2f1..670cc64 100644
--- a/scripts/termux-download.in
+++ b/scripts/termux-download.in
@@ -1,4 +1,6 @@
 #!@TERMUX_PREFIX@/bin/sh
+# shellcheck shell=bash
+
 set -e -u
 
 SCRIPTNAME=termux-download
diff --git a/scripts/termux-fingerprint.in b/scripts/termux-fingerprint.in
index ecb40b8..df4ac84 100644
--- a/scripts/termux-fingerprint.in
+++ b/scripts/termux-fingerprint.in
@@ -1,4 +1,6 @@
 #!@TERMUX_PREFIX@/bin/sh
+# shellcheck shell=bash
+
 set -e -u
 
 SCRIPTNAME=termux-fingerprint
diff --git a/scripts/termux-infrared-frequencies.in b/scripts/termux-infrared-frequencies.in
index f7a494c..77bbcb5 100644
--- a/scripts/termux-infrared-frequencies.in
+++ b/scripts/termux-infrared-frequencies.in
@@ -1,4 +1,6 @@
 #!@TERMUX_PREFIX@/bin/sh
+# shellcheck shell=bash
+
 set -e -u
 
 SCRIPTNAME=termux-infrared-frequencies
diff --git a/scripts/termux-infrared-transmit.in b/scripts/termux-infrared-transmit.in
index 81c912a..ad58ba9 100644
--- a/scripts/termux-infrared-transmit.in
+++ b/scripts/termux-infrared-transmit.in
@@ -1,4 +1,6 @@
 #!@TERMUX_PREFIX@/bin/sh
+# shellcheck shell=bash
+
 set -e -u
 
 SCRIPTNAME=termux-infrared-transmit
diff --git a/scripts/termux-job-scheduler.in b/scripts/termux-job-scheduler.in
index 26c9ec1..cf0b58b 100644
--- a/scripts/termux-job-scheduler.in
+++ b/scripts/termux-job-scheduler.in
@@ -1,4 +1,6 @@
 #!@TERMUX_PREFIX@/bin/bash
+# shellcheck shell=bash
+
 set -e -u -f
 
 SCRIPTNAME=termux-job-scheduler
diff --git a/scripts/termux-keystore.in b/scripts/termux-keystore.in
index d6d7ccc..0544ced 100644
--- a/scripts/termux-keystore.in
+++ b/scripts/termux-keystore.in
@@ -1,4 +1,6 @@
 #!@TERMUX_PREFIX@/bin/sh
+# shellcheck shell=bash
+
 set -e -u
 
 readonly CMD_BASE="@TERMUX_PREFIX@/libexec/termux-api Keystore"
diff --git a/scripts/termux-location.in b/scripts/termux-location.in
index 7c9eb96..dc08e39 100644
--- a/scripts/termux-location.in
+++ b/scripts/termux-location.in
@@ -1,4 +1,6 @@
 #!@TERMUX_PREFIX@/bin/sh
+# shellcheck shell=bash
+
 set -e -u
 
 SCRIPTNAME=termux-location
diff --git a/scripts/termux-notification-list.in b/scripts/termux-notification-list.in
index 2015197..99901dd 100644
--- a/scripts/termux-notification-list.in
+++ b/scripts/termux-notification-list.in
@@ -1,4 +1,6 @@
 #!@TERMUX_PREFIX@/bin/sh
+# shellcheck shell=bash
+
 set -e -u
 
 SCRIPTNAME=termux-notification-list
diff --git a/scripts/termux-notification-remove.in b/scripts/termux-notification-remove.in
index 62b1c9d..cd52de9 100644
--- a/scripts/termux-notification-remove.in
+++ b/scripts/termux-notification-remove.in
@@ -1,4 +1,6 @@
 #!@TERMUX_PREFIX@/bin/sh
+# shellcheck shell=bash
+
 set -e -u
 
 SCRIPTNAME=termux-notification-remove
diff --git a/scripts/termux-saf-create.in b/scripts/termux-saf-create.in
index 8b50e16..a9e19a4 100644
--- a/scripts/termux-saf-create.in
+++ b/scripts/termux-saf-create.in
@@ -1,4 +1,6 @@
 #!@TERMUX_PREFIX@/bin/sh
+# shellcheck shell=bash
+
 set -e -u
 
 SCRIPTNAME=termux-saf-create
diff --git a/scripts/termux-saf-dirs.in b/scripts/termux-saf-dirs.in
index e62e4df..87f4b65 100644
--- a/scripts/termux-saf-dirs.in
+++ b/scripts/termux-saf-dirs.in
@@ -1,4 +1,6 @@
 #!@TERMUX_PREFIX@/bin/sh
+# shellcheck shell=bash
+
 set -e -u
 
 SCRIPTNAME=termux-saf-dirs
diff --git a/scripts/termux-saf-ls.in b/scripts/termux-saf-ls.in
index 7aeb807..0a279ae 100644
--- a/scripts/termux-saf-ls.in
+++ b/scripts/termux-saf-ls.in
@@ -1,4 +1,6 @@
 #!@TERMUX_PREFIX@/bin/sh
+# shellcheck shell=bash
+
 set -e -u
 
 SCRIPTNAME=termux-saf-ls
diff --git a/scripts/termux-saf-managedir.in b/scripts/termux-saf-managedir.in
index 1567033..2ea9612 100644
--- a/scripts/termux-saf-managedir.in
+++ b/scripts/termux-saf-managedir.in
@@ -1,4 +1,6 @@
 #!@TERMUX_PREFIX@/bin/sh
+# shellcheck shell=bash
+
 set -e -u
 
 SCRIPTNAME=termux-saf-managedir
diff --git a/scripts/termux-saf-mkdir.in b/scripts/termux-saf-mkdir.in
index 2dbc28d..2923472 100644
--- a/scripts/termux-saf-mkdir.in
+++ b/scripts/termux-saf-mkdir.in
@@ -1,4 +1,6 @@
 #!@TERMUX_PREFIX@/bin/sh
+# shellcheck shell=bash
+
 set -e -u
 
 SCRIPTNAME=termux-saf-mkdir
diff --git a/scripts/termux-saf-read.in b/scripts/termux-saf-read.in
index 89c195e..d17161a 100644
--- a/scripts/termux-saf-read.in
+++ b/scripts/termux-saf-read.in
@@ -1,4 +1,6 @@
 #!@TERMUX_PREFIX@/bin/sh
+# shellcheck shell=bash
+
 set -e -u
 
 SCRIPTNAME=termux-saf-read
diff --git a/scripts/termux-saf-rm.in b/scripts/termux-saf-rm.in
index 0d41316..ea9e6c2 100644
--- a/scripts/termux-saf-rm.in
+++ b/scripts/termux-saf-rm.in
@@ -1,4 +1,6 @@
 #!@TERMUX_PREFIX@/bin/sh
+# shellcheck shell=bash
+
 set -e -u
 
 SCRIPTNAME=termux-saf-rm
diff --git a/scripts/termux-saf-stat.in b/scripts/termux-saf-stat.in
index 8a49f4e..ee61726 100644
--- a/scripts/termux-saf-stat.in
+++ b/scripts/termux-saf-stat.in
@@ -1,4 +1,6 @@
 #!@TERMUX_PREFIX@/bin/sh
+# shellcheck shell=bash
+
 set -e -u
 
 SCRIPTNAME=termux-saf-stat
diff --git a/scripts/termux-saf-write.in b/scripts/termux-saf-write.in
index 5109bde..e94e945 100644
--- a/scripts/termux-saf-write.in
+++ b/scripts/termux-saf-write.in
@@ -1,4 +1,6 @@
 #!@TERMUX_PREFIX@/bin/sh
+# shellcheck shell=bash
+
 set -e -u
 
 SCRIPTNAME=termux-saf-write
diff --git a/scripts/termux-share.in b/scripts/termux-share.in
index 90177d5..10aa54d 100644
--- a/scripts/termux-share.in
+++ b/scripts/termux-share.in
@@ -1,4 +1,6 @@
 #!@TERMUX_PREFIX@/bin/sh
+# shellcheck shell=bash
+
 set -e -u
 
 SCRIPTNAME=termux-share
diff --git a/scripts/termux-sms-inbox.in b/scripts/termux-sms-inbox.in
index bf26917..226f2c8 100644
--- a/scripts/termux-sms-inbox.in
+++ b/scripts/termux-sms-inbox.in
@@ -1,4 +1,6 @@
 #!@TERMUX_PREFIX@/bin/sh
+# shellcheck shell=bash
+
 
 echo "termux-sms-inbox: This script has been replaced by termux-sms-list."
 exit 1
diff --git a/scripts/termux-sms-list.in b/scripts/termux-sms-list.in
index dbeab67..7921a50 100644
--- a/scripts/termux-sms-list.in
+++ b/scripts/termux-sms-list.in
@@ -1,4 +1,6 @@
 #!@TERMUX_PREFIX@/bin/sh
+# shellcheck shell=bash
+
 set -u
 
 PARAM_LIMIT=10
diff --git a/scripts/termux-sms-send.in b/scripts/termux-sms-send.in
index 8a1bd4c..f6edc54 100644
--- a/scripts/termux-sms-send.in
+++ b/scripts/termux-sms-send.in
@@ -1,4 +1,6 @@
 #!@TERMUX_PREFIX@/bin/sh
+# shellcheck shell=bash
+
 set -e -u
 
 SCRIPTNAME=termux-sms-send
diff --git a/scripts/termux-speech-to-text.in b/scripts/termux-speech-to-text.in
index 4bc7fd0..de5c168 100644
--- a/scripts/termux-speech-to-text.in
+++ b/scripts/termux-speech-to-text.in
@@ -1,4 +1,6 @@
 #!@TERMUX_PREFIX@/bin/sh
+# shellcheck shell=bash
+
 set -e -u
 
 SCRIPTNAME=termux-speech-to-text
diff --git a/scripts/termux-storage-get.in b/scripts/termux-storage-get.in
index 86b236e..598921b 100644
--- a/scripts/termux-storage-get.in
+++ b/scripts/termux-storage-get.in
@@ -1,4 +1,6 @@
 #!@TERMUX_PREFIX@/bin/sh
+# shellcheck shell=bash
+
 set -e -u
 
 SCRIPTNAME=termux-storage-get
diff --git a/scripts/termux-telephony-call.in b/scripts/termux-telephony-call.in
index 5a61015..1ccbe6a 100644
--- a/scripts/termux-telephony-call.in
+++ b/scripts/termux-telephony-call.in
@@ -1,4 +1,6 @@
 #!@TERMUX_PREFIX@/bin/sh
+# shellcheck shell=bash
+
 set -e -u
 
 SCRIPTNAME=termux-telephony-call
diff --git a/scripts/termux-telephony-cellinfo.in b/scripts/termux-telephony-cellinfo.in
index e5c3d30..56db2b4 100644
--- a/scripts/termux-telephony-cellinfo.in
+++ b/scripts/termux-telephony-cellinfo.in
@@ -1,4 +1,6 @@
 #!@TERMUX_PREFIX@/bin/sh
+# shellcheck shell=bash
+
 set -e -u
 
 SCRIPTNAME=termux-telephony-cellinfo
diff --git a/scripts/termux-telephony-deviceinfo.in b/scripts/termux-telephony-deviceinfo.in
index 14115dc..627dda4 100644
--- a/scripts/termux-telephony-deviceinfo.in
+++ b/scripts/termux-telephony-deviceinfo.in
@@ -1,4 +1,6 @@
 #!@TERMUX_PREFIX@/bin/sh
+# shellcheck shell=bash
+
 set -e -u
 
 SCRIPTNAME=termux-telephony-deviceinfo
diff --git a/scripts/termux-torch.in b/scripts/termux-torch.in
index cf30efb..b7c98de 100644
--- a/scripts/termux-torch.in
+++ b/scripts/termux-torch.in
@@ -1,4 +1,6 @@
 #!@TERMUX_PREFIX@/bin/sh
+# shellcheck shell=bash
+
 set -e -u
 
 SCRIPTNAME=termux-torch
diff --git a/scripts/termux-tts-engines.in b/scripts/termux-tts-engines.in
index af0959b..591b2fe 100644
--- a/scripts/termux-tts-engines.in
+++ b/scripts/termux-tts-engines.in
@@ -1,4 +1,6 @@
 #!@TERMUX_PREFIX@/bin/sh
+# shellcheck shell=bash
+
 set -e -u
 
 SCRIPTNAME=termux-tts-engines
diff --git a/scripts/termux-tts-speak.in b/scripts/termux-tts-speak.in
index bd95037..ed19951 100644
--- a/scripts/termux-tts-speak.in
+++ b/scripts/termux-tts-speak.in
@@ -1,4 +1,6 @@
 #!@TERMUX_PREFIX@/bin/sh
+# shellcheck shell=bash
+
 set -e -u
 
 SCRIPTNAME=termux-tts-speak
diff --git a/scripts/termux-vibrate.in b/scripts/termux-vibrate.in
index 36b03fa..270f1ad 100644
--- a/scripts/termux-vibrate.in
+++ b/scripts/termux-vibrate.in
@@ -1,4 +1,6 @@
 #!@TERMUX_PREFIX@/bin/sh
+# shellcheck shell=bash
+
 set -e -u
 
 SCRIPTNAME=termux-vibrate
diff --git a/scripts/termux-wifi-connectioninfo.in b/scripts/termux-wifi-connectioninfo.in
index dde982f..2754ec7 100644
--- a/scripts/termux-wifi-connectioninfo.in
+++ b/scripts/termux-wifi-connectioninfo.in
@@ -1,4 +1,6 @@
 #!@TERMUX_PREFIX@/bin/sh
+# shellcheck shell=bash
+
 set -e -u
 
 SCRIPTNAME=termux-wifi-connectioninfo
diff --git a/scripts/termux-wifi-enable.in b/scripts/termux-wifi-enable.in
index 9e9a1ef..d3f5521 100644
--- a/scripts/termux-wifi-enable.in
+++ b/scripts/termux-wifi-enable.in
@@ -1,4 +1,6 @@
 #!@TERMUX_PREFIX@/bin/sh
+# shellcheck shell=bash
+
 set -e -u
 
 SCRIPTNAME=termux-wifi-enable
diff --git a/scripts/termux-wifi-scaninfo.in b/scripts/termux-wifi-scaninfo.in
index 85b5fdb..9efe6f0 100644
--- a/scripts/termux-wifi-scaninfo.in
+++ b/scripts/termux-wifi-scaninfo.in
@@ -1,4 +1,6 @@
 #!@TERMUX_PREFIX@/bin/sh
+# shellcheck shell=bash
+
 set -e -u
 
 SCRIPTNAME=termux-wifi-scaninfo