diff --git a/bin/bangs b/bin/bangs
index ccbe14f..053256b 100755
--- a/bin/bangs
+++ b/bin/bangs
@@ -9,6 +9,8 @@
 # ```
 # will open a search result page on Google and Arch Wiki
 
+# TODO:
+# - Make the config compatible to bangs database from Duckduckgo.
 proc usage() {
     cat <<HELP
 bangs - a ripoff from Duckduckgo bangs, except
@@ -102,13 +104,13 @@ if (len(ARGV) == 0) {
 
 for i in @ARGV {
   write -- $i | rg --quiet $bangs_format || {
-    push :search_query $i
+    append :search_query $i
     continue
   }
 
   var bang = $(write -- $i | sed --regexp-extended --expression "s/^${bangs_prefix}//")
   if (bang in bangs) {
-    push :valid_bangs $bang
+    append :valid_bangs $bang
     warnf "%s will be used to search." $bang
   } else {
     warnf "%s is not found in the database." $bang
diff --git a/bin/choose-emoji-menu b/bin/choose-emoji-menu
index e1cd2bb..f859c9d 100755
--- a/bin/choose-emoji-menu
+++ b/bin/choose-emoji-menu
@@ -1,4 +1,5 @@
-#!/usr/bin/env bash
+#!/usr/bin/env nix-shell
+#! nix-shell --pure -i bash -p mktemp wget gnused gawk rofi xclip libnotify
 
 # Simply create a universal emoji selection list.
 # The emoji list should be the following file:
diff --git a/bin/convert-newpipe-db b/bin/convert-newpipe-db
index af1dfa6..f18742c 100755
--- a/bin/convert-newpipe-db
+++ b/bin/convert-newpipe-db
@@ -1,9 +1,10 @@
-#!/usr/bin/env oil
+#!/usr/bin/env nix-shell
+#! nix-shell -i oil -p coreutils sqlite unzip ripgrep jq file
 
 # Convert a Newpipe database (assuming it was exported within the app) into OPML v2.
 
 # Dependencies:
-# * osh (oil shell) v0.8.5
+# * osh (oil shell) v0.8.12
 # * sqlite3 v3.34.0
 # * unzip
 # * ripgrep v12.1.1
@@ -26,7 +27,7 @@ var NEWPIPE_DB_QUERY = "SELECT name, url, service_id, group_concat(tag, ',') AS
 FROM subscriptions
 LEFT JOIN feed_group_subscription_join AS subs_join
 LEFT JOIN feed_group
-ON subs_join.subscription_id = subscriptions.uid AND feed_group.uid = subs_join.group_id) GROUP BY name"
+ON subs_join.subscription_id = subscriptions.uid AND feed_group.uid = subs_join.group_id) GROUP BY name ORDER BY name COLLATE NOCASE;"
 
 # Print the beginning of the template.
 cat <<OPML
diff --git a/bin/split-album b/bin/split-album
index 539036f..a21f6e5 100755
--- a/bin/split-album
+++ b/bin/split-album
@@ -164,7 +164,7 @@ proc prompt(msg, :out, prefix = ">> ") {
 }
 
 proc kebab-case(word) {
-    write -- $word | sed --regexp-extended --expression 's/./\L&/g' --expression 's/\s+/-/g' --expression 's/[^.a-z0-9-]//g' --expression 's/^-+|-+$//g' --expression 's/-+/-/g'
+    write -- $word | sed --regexp-extended --expression 's/./\L&/g' --expression 's/\s+/-/g' --expression 's/[^a-z0-9-]//g' --expression 's/^-+|-+$//g' --expression 's/-+/-/g'
 }
 
 test -f $audio_file || errorf '%s is not a regular file' $audio_file
@@ -236,7 +236,7 @@ for index in @(seq $[chapter_len]) {
         setvar has_error = true
     }
 
-    push :job_queue ">&2 printf '[%d/%d] %s\\n' $[index] $[chapter_len] \"$[output_data['chapters'][index - 1]['title']]\" && ffmpeg -loglevel quiet -nostdin -i '${audio_file}' -ss ${start} $['-to ' + end if index != chapter_len else ''] ${title_slug}/${filename}"
+    append :job_queue ">&2 printf '[%d/%d] %s\\n' $[index] $[chapter_len] \"$[output_data['chapters'][index - 1]['title']]\"; ffmpeg -loglevel quiet -nostdin -i '${audio_file}' -ss ${start} $['-to ' + end if index != chapter_len else ''] ${title_slug}/${filename}"
 }
 
 if (has_error) { exit 1 }