It's super basic, but the option memorandum of the process confirmation command ps.

ps No options. It comes out with the process of my user omitted.

$ ps

  PID TTY           TIME CMD
24863 ttys000    0:00.10 /bin/bash -l
32161 ttys004    0:00.05 -bash

ps -f f option. You can additionally check the UID, PPID, C, and STIME columns.

$ ps -f

  UID   PID  PPID   C STIME   TTY           TIME CMD
  501 24863 24861   0  7:32PM ttys000    0:00.10 /bin/bash -l
  501 32161 32160   0  6:45PM ttys004    0:00.05 -bash

ps -ef

$ ps -ef

  UID   PID  PPID   C STIME   TTY           TIME CMD
0 1 0 0 Thu 10 AM??         3:30.67 /sbin/launchd
0 102 1 0 Thu 10 AM??         0:07.61 /usr/sbin/syslogd
0 103 1 0 Thu 10 AM??         0:17.05 /usr/libexec/UserEventAgent (System)
...

The running processes of all users are displayed in full.

column	meaning
UID	User ID
PID	Process number
PPID	Parent process ID
C	Process CPU usage
STIME	Process start time
TTY	Terminal name
TIME	Total process execution time
CMD	Execution command name

ps -ef | grep xxxx Basically use this when you want to find a process.

$ ps -ef | grep xxxx

Example

$ ps -ef | grep httpd

0 141 1 0 Thu 10 AM??         0:02.34 /usr/sbin/httpd -D FOREGROUND
70 320 141 0 Thu 10AM??         0:00.00 /usr/sbin/httpd -D FOREGROUND
  501 32954 32161   0  7:31PM ttys004    0:00.00 grep httpd

reference

[Linux] Reason for adding -ef option when executing ps | Financial engineer

[LINUX] Process confirmation command ps option memorandum

Example

reference