turned into posix sh

dotfiles/bspwm/polybar/launch.sh

@@ -1,10 +1,10 @@
-#!/bin/bash
+#!/bin/sh
 
 # Terminate already running bar instances
 pkill polybar
 
 # Wait until the processes have been shut down
-while pgrep -u $UID -x polybar >/dev/null; do sleep 1; done
+while pgrep -u "$(id -u)" -x polybar >/dev/null; do sleep 1; done
 
 # Launch Polybar, using default config location ~/.config/polybar/config