ps[options]
Report on active processes. In options, list arguments
should either be separated by commas or put in double quotes.
In comparing the amount of output produced, note that
-e > -d > -a and -l > -f.
In the BSD version, options work much differently; you can also
display data for a single process.
List all processes except group leaders and processes not associated with a terminal.
List scheduler data set by priocntl.
List all processes except session leaders.
List all processes.
Produce a full listing.
listList data only for specified list of group leader ID numbers
(i.e., processes with same ID and group ID).
Print the process group ID and session ID.
Produce a long listing.
listUse the alternate list of names (default is /unix);
obsolete as of Release 4.
listList data only for process IDs in list.
listList data only for session leader IDs in list.
listList data only for terminals in list (e.g., tty1).
listList data only for usernames in list.