diff --git a/bin/cliplumber b/bin/cliplumber
index d2d076f..fc4542b 100755
--- a/bin/cliplumber
+++ b/bin/cliplumber
@@ -1,22 +1,14 @@
 #!/bin/sh
 
+# Load helper functions
+source "$(dirname "$(rreadlink "$0")")/../lib/utils.sh"
+
 # TODO: detect term or set it globally
 TERM_EMU="kitty"
 
-die() {
-    notify-send "$@"
-    exit 1
-}
-
-check_exists() {
-    for c in $@; do
-        which "$c" > /dev/null 2>&1 || return 1
-    done
-}
-
-if ! which wl-paste > /dev/null 2>&1 && [ ! -z "$WAYLAND_DISPLAY" ]; then
+if ! check_exists wl-paste && [ ! -z "$WAYLAND_DISPLAY" ]; then
     die "Wayland detected and wl-paste not found"
-elif ! which xsel > /dev/null 2>&1 && [ -z "$WAYLAND_DISPLAY" ]; then
+elif ! check_exists xsel && [ -z "$WAYLAND_DISPLAY" ]; then
     die "xsel not found"
 fi
 
@@ -61,7 +53,7 @@ case "$choice" in
         path="$HOME/mus/$(printf "%s" "$choice" | cut -d " " -f 2-)"
         [ -d "$path" ] || mkdir -p "$path"
         cd "$path" || exit
-        youtube-dl -x --audio-format mp3 --no-playlist -o "%(title)s.%(ext)s" "$urls" 2>&1 | grep 'ERROR:' | tee /dev/fd/2 | xargs -n1 -d "\n" notify-send
+        youtube-dl -x --audio-format mp3 --no-playlist -o "%(title)s.%(ext)s" "$urls" 2>&1 | grep 'ERROR:' | notify_err
         ;;
     "crawl")
         path="$HOME/books/"
@@ -70,7 +62,7 @@ case "$choice" in
         out="$(lncrawl --single --all --format epub --filename-only --suppress -s "$urls" | grep -vFe "Input is suppressed" -e "Namespace(")"
         errors="$(printf "%s" "$out" | grep -Fe " ❗ ")"
         if [ -n "$errors" ]; then
-            printf "%s" "$errors" | xargs -n1 -d "\n" notify-send
+            printf "%s" "$errors" | notify_err
         else
             printf "%s" "$out" | sed -ne '/^NOVEL: /s/NOVEL: \(.*\)/Successfully crawled "\1"/p' | xargs -0 -n1 notify-send
         fi
diff --git a/bin/dragon b/bin/dragon
index 7e2e777..452c2fd 100755
--- a/bin/dragon
+++ b/bin/dragon
@@ -3,8 +3,9 @@
 # We use a script instead of an alias because we want this utility in our path,
 # usable from dmenu
 
-if ! which dragon-drag-and-drop > /dev/null 2>&1; then
-    echo "Error: dragon-drag-and-drop isn't installed!" | tee /dev/fd/2 | xargs -n1 -d "\n" notify-send
-fi
+# Load helper functions
+source "$(dirname "$(rreadlink "$0")")/../lib/utils.sh"
 
-dragon-drag-and-drop $*
+assert_exists dragon-drag-and-drop
+
+dragon-drag-and-drop "$@"
diff --git a/bin/playvideo b/bin/playvideo
index c7e0a3c..f637fe3 100755
--- a/bin/playvideo
+++ b/bin/playvideo
@@ -1,7 +1,10 @@
 #!/bin/sh
 
-if [ "$1" = "-h" ] || [ "$#" -ne "1" ]; then
-    >&2 echo "Usage: $0 <input.mp4> <output.gif>"
+# Load helper functions
+source "$(dirname "$(rreadlink "$0")")/../lib/utils.sh"
+
+if [ "$1" = "-h" ] || [ "$#" -lt "1" ]; then
+    >&2 echo "Usage: $0 [-l] <video url>"
     exit 1
 fi
 
diff --git a/bin/shot b/bin/shot
index dc0f061..0c6cfc4 100755
--- a/bin/shot
+++ b/bin/shot
@@ -1,15 +1,8 @@
 #!/bin/sh
 
-die() {
-    # When run from WM, $TERM appear to be set to "linux"
-    # TODO: find a less brittle solution
-    [ "$TERM" = "linux" ] && notify-send "$@" || echo "$@"
-    exit 1
-}
-
-check_exists() {
-    which "$1" > /dev/null 2>&1 || die "$1 doesn't appear to be installed"
-}
+# Load helper functions
+bin_path="$(dirname "$(rreadlink "$0")")"
+source "$bin_path/../lib/utils.sh"
 
 if [ -z "$1" ]; then
     NAME="shot_$(date '+%Y%m%d%H%M%S').png"
@@ -21,13 +14,12 @@ SCREEN_DIR="$HOME/img/screenshots"
 mkdir -p "$SCREEN_DIR"
 # Let's try to detect Wayland running
 if [ -z "$WAYLAND_DISPLAY" ]; then
-    check_exists "maim"
+    assert_exists "maim"
     maim --hidecursor --select "$SCREEN_DIR/$NAME"
     # Fail silently if xsel isn't installed, the clipboard feature isn't critical
     echo "$SCREEN_DIR/$NAME" | xsel --clipboard --input > /dev/null 2>&1
 else
-    check_exists "grim"
-    check_exists "slop"
+    assert_exists "grim" "slop"
     slop | awk -F '[x+]' '{printf "%s,%s %sx%s",$3,$4,$1,$2}' | grim -g - "$SCREEN_DIR/$NAME"
     # Same as xsel
     wl-copy -n "$SCREEN_DIR/$NAME" > /dev/null 2>&1