Really disposable (RAM based) qubes

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Thanks for the clarification and the script! I had a few issues with it, and made the slight changes below to get it working and to give more whitespace in the tray

EDIT: Made the xl output more human-friendly!

#!/bin/bash

set -euo pipefail
/usr/bin/renice -n 19 $$ > /dev/null 2>&1

pattern='s/Mem:(\s*[0-9.a-zA-Z]+){2}\s*([0-9\.a-zA-Z]+).*/\2/g'
free_mem=$(/usr/bin/free --human | \
			 head --lines=2 | \
			 tail --lines=1 | \
			 sed -r "${pattern}")

pattern='s/Swap:(\s*[0-9.a-zA-Z]+){1}\s*([0-9\.a-zA-Z]+).*/\2/g'
used_swap=$(/usr/bin/free --human | \
             head --lines=3 | \
             tail --lines=1 | \
             sed -r "${pattern}")

printf "  %s [%s] %s"   "$((`xl info | grep free_memory | sed 's/^.*:\([0-9]*\)/\1/'` / 1000))Gi"   "${free_mem}"   "${used_swap}  "
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