$ps -e "kworker$"
error: unknown sort specifier

Usage:
 ps [options]

 Try 'ps --help '
  or 'ps --help '
 for additional help text.

For more details see ps(1).
$ps -ef | grep "^daemon"
daemon     639     1  0 May04 ?        00:00:00 /usr/sbin/atd -f
$ps -ef | grep "^rtkit"
rtkit     1245     1  0 May04 ?        00:00:00 /usr/lib/rtkit/rtkit-daemon
$ps -ef | grep "^systemd+"
systemd+   522     1  0 May04 ?        00:00:00 /lib/systemd/systemd-timesyncd
$