Bash script to lift and focus on (most recently focused) apps.

focus-window.sh

#!/usr/bin/env bash
# https://askubuntu.com/a/562191

usage() {
    echo Usage: $(basename $0) PATTERN
    exit 1
}
[ $# -ne 1 ] && usage

pattern=$1
workspace=$(wmctrl -d | grep '\*' | cut -d' ' -f1)
targets=$(wmctrl -lx | grep -i $pattern | grep " $workspace " | cut -c-10 | sed -ne 's|0x0\+|0x|gp')

if [ -z "$targets" ]; then
    echo No such window in workspace
    exit 1
fi

recents=$(xprop -root _NET_CLIENT_LIST_STACKING | sed -ne 's|.\+#|,|' -e 's|, | |gp' | tac -s ' ')

for candidate in $recents; do
    if echo $targets | grep -q $candidate; then
        # wmctrl -lx | grep $candidate  # debug
        wmctrl -ia $candidate
        exit 0
    fi
done

echo Accidental error
exit 1