#!/bin/sh

psout=$(ps -u $USER -o pid,%cpu,%mem,comm | sed -n '1!p' | sort -b -k2 -r| cut --characters=1-18 --complement | awk '!x[$0]++'| dmenu -i -l 15  )
//uniq without piping into sort before with the help of awk

killall $psout 2>/dev/null &&
[ -n $psout ] && dunstify "Terminated all processes Successfully" "$psout was killed"