pgrep is a little slow, slower than ps | grep

.local/bin/launch_polybar

@@ -4,7 +4,7 @@
 killall -q polybar
 
 # Wait until the processes have been shut down
-while pgrep -x polybar >/dev/null; do sleep 1; done
+while ps ax | grep -q "\spolybar$"; do sleep 1; done
 
 for i in $(polybar -m | awk -F: '{print $1}'); do MONITOR=$i polybar default & done