ps: Clean way to only get parent processes?

Question

I use ps ef and ps rf a lot.

Here is a sample output for ps rf:

  PID TTY      STAT   TIME COMMAND
 3476 pts/0         


        

Answer 1

From key words KEYWORD

ps aux | grep -i KEYWORD | grep -v grep | awk '{print $2}'|sort -h|head -1|xargs kill

BTW, is this assumption that parent process ID is the smallest ID valid？？？？