Mapping PID to Window ID / For Focusing and More!

CMD_PID=${1} && while IFS= read -r -d '' var; do 
if grep -q "^WINDOWID=" <<< "$var"; then 
 winid=$(printf '0x%x\n' $(sed 's/WINDOWID=//' <<< "${var}"))
 child_cnt=0 && IFS=$(echo -en "\n\b") && 
for a in $(xwininfo -root -tree | tac | sed -n "/${winid}/,\$p"); do 
 grep -q -i "children" <<< "${a}" && let child_cnt+=1
 ((${child_cnt} == 2)) && real_winid=$(grep -o '0x[^ ]*' <<< "${last_line}") && break
 last_line="${a}"
 done 
 xdotool windowraise ${real_winid} 
 break 
fi 
done < /proc/${CMD_PID}/environ