[sh] How to store the command execution result in a variable

$ set $(echo "1 2 3" | awk -F" " '{print $1, $2, $3}' )
$ echo $1
1
$ echo $2
2
$ echo $3
3

cmd="Zombie process name"   #Zombie process created by bugs
ppid=1                  # PPID=1

ps all | while read F UID PID
do
    set $(ps o pid,ppid,cmd -p $PID | tail -n1 | awk -F" " '{print $1, $2, $3}'
    if [ $ppid = $2 ] && [ $cmd = $3 ] ; then
        sudo kill -9 $PID
    fi
done

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