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ladybird/Base/usr/share/man/man1/ps.md
Tim Ledbetter 73a6f2e9ed ps: Add the -o option to specify a user-defined column format 
This option allows the user to change which colums are displayed
by giving comma or space separated list of column format specifiers.

A column format specifier is of the form: `COLUMN_NAME[=COLUMN_TITLE]`.
Where `COLUMN_NAME` is any of: uid, pid, ppid, pgid, sid, state, tty,
or cmd. Specifying a `COLUMN_TITLE` will change the name shown in the
column header.

`COLUMN_TITLE` may be blank. If all given column titles
are blank, the header is omitted.
2023-07-19 11:21:59 +01:00

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Name

ps - list currently running processes

Synopsis

$ ps [--version] [-a] [-A] [-e] [-f] [-o column-format] [-p pid-list] [--ppid pid-list] [-q pid-list] [-t tty-list] [-u user-list]

Description

Print a list of currently running processes in the current TTY. For each process, print its PID (process ID), to which TTY it belongs, and invoking commandline (CMD).

Options

  • -a: Consider all processes that are associated with a TTY.

  • -A or -e: Consider all processes, not just those in the current TTY.

  • -f: Also print for each process: UID (as resolved username), PPID (parent PID), and STATE (Runnable, Sleeping, Selecting, Reading, etc.)

  • -o column-format: Specify a user-defined format, as a list of column format specifiers separated by commas or spaces.

    A column format specifier is of the form: COLUMN_NAME[=COLUMN_TITLE]. Where COLUMN_NAME is any of the following: uid, pid, ppid, pgid, sid, state, tty, or cmd.

    Specifying a COLUMN_TITLE will change the name shown in the column header. COLUMN_TITLE may be blank. If all given column titles are blank, the column header is omitted.

  • -p pid-list: Select processes matching any of the given PIDs. pid-list is a list of PIDs, separated by commas or spaces.

  • --ppid pid-list: Select processes whose PPID matches any of the given PIDs. pid-list is a list of PIDs, separated by commas or spaces.

  • -q pid-list: Only consider the given PIDs, if they exist. Output the processes in the order provided by pid-list. pid-list is a list of PIDs, separated by commas or spaces.

  • -t tty-list: Select processes associated with any of the given terminals. tty-list is a list of short TTY names (e.g: pts:0) or the full TTY device paths, separated by commas or spaces.

  • -u user-list: Select processes matching any of the given UIDs. user-list is a list of UIDs or login names, separated by commas or spaces.

Examples

Show all processes (full format):

$ ps -ef

Show the PID, state and name of all processes

$ ps -eo pid,state,cmd

Show the name and state of PID 42 and rename the first column from CMD to Command:

$ ps -q 42 -o cmd=Command,state

Show name of PID 42 and omit the header entirely

$ ps -q 42 -o cmd=

See Also