diff --git a/bin/glurp b/bin/glurp
index f387df9..4cc648f 100755
--- a/bin/glurp
+++ b/bin/glurp
@@ -1,61 +1,52 @@
-#!/bin/bash
+#!/bin/sh
 
-# Functions
-# Error
-function error {
-    >&2 echo -e "\033[1;31mERROR:\033[0m $1"; shift
-    exit "${1:-1}"
+error_usage() {
+    >&2 cat << EOF
+Usage :
+    glurp full|area clip|file
+EOF
+    exit 1
 }
 
-# Throw a value
-function throw-value {
-    error "Value \"${1}\" invalid for ${2}." 1
+screenshot_path() {
+    printf %s "/tmp/screenshot-${USER}-$(date +%N).png"
 }
 
-function screenshot-path {
-    printf '%s%s-screenshot-%s.png' "${screenshot_d}/" "${LOGNAME}" "$(date +'%Y_%m_%d_%s')"
-}
-
-# Variables
-declare -a prepend _command append
-screenshot_d=/tmp
+grim=grim
+wl_copy_args="-t image/png"
 
 # Arguments
-selection_mode="$1"; shift
-saving_mode="$1"   ; shift
-
-# Command building
-_command+=(grim)
-case "$selection_mode" in
+case "$1" in
     full)
-        :
         ;;
     area)
-        _command+=(-g -)
-        prepend+=(slurp)
+        slurp=slurp
+        pipe1='|'
+        grim_args="-g -"
         ;;
     *)
-        throw-value "$selection_mode" 'selection mode'
+        error_usage
         ;;
 esac
-case "$saving_mode" in
+shift
+
+case "$1" in
     clip)
-        _command+=(-)
-        append+=(wl-copy -t image/png)
+        pipe2='|'
+        wl_copy=wl-copy
         ;;
     file)
-        _command+=("$(screenshot-path)")
+        grim_args="${grim_args} $(screenshot_path)"
         ;;
     *)
-        throw-value "$saving_mode" 'saving mode'
+        error_usage
         ;;
 esac
+shift
 
-# Debug
-#echo "${prepend[@]} | ${_command[@]} | ${append[@]}"
-#exit 0
+[ -n "$wl_copy" ] && wl_copy="${wl_copy} ${wl_copy_args}"
 
 # Execution
 set -xe
-"${prepend[@]}" | "${_command[@]}" | "${append[@]}"
+"$slurp" "$pipe1" "$grim" "$grim_args" "$pipe2" "$wl_copy"