ps (Unix)

KolibriOS includes an implementation of the {{code|ps}} command.{{Cite web|url=http://wiki.kolibrios.org/wiki/Shell|title=Shell - KolibriOS wiki}} The {{Mono|ps}} command has also been ported to the IBM i operating system.{{cite web |title=IBM System i Version 7.2 Programming Qshell |language=en |author=IBM |website=IBM |author-link=IBM |url=https://www.ibm.com/support/knowledgecenter/ssw_ibm_i_74/rzahz/rzahzpdf.pdf?view=kc |access-date=2020-09-05 }} In Windows PowerShell, ps is a predefined command alias for the Get-Process cmdlet, which essentially serves the same purpose.

1. ps

PID TTY TIME CMD

7431 pts/0 00:00:00 su

7434 pts/0 00:00:00 bash

18585 pts/0 00:00:00 ps

Users can pipeline ps with other commands, such as less to view the process status output one page at a time:

$ ps -A | less

Users can also utilize the ps command in conjunction with the grep command (see the pgrep and pkill commands) to find information about a single process, such as its id:

$ # Trying to find the PID of `firefox-bin` which is 2701

$ ps -A | grep firefox-bin

2701 ? 22:16:04 firefox-bin

The use of pgrep simplifies the syntax and avoids potential race conditions:

$ pgrep -l firefox-bin

2701 firefox-bin

To see every process running as root in user format:

1. ps -U root -u

USER PID %CPU %MEM VSZ RSS TT STAT STARTED TIME COMMAND

root 1 0.0 0.0 9436 128 - ILs Sun00AM 0:00.12 /sbin/init --

* = Often abbreviated

ps has many options. On operating systems that support the SUS and POSIX standards, ps commonly runs with the options -ef, where "-e" selects every process and "-f" chooses the "full" output format. Another common option on these systems is -l, which specifies the "long" output format.

Most systems derived from BSD fail to accept the SUS and POSIX standard options because of historical conflicts. (For example, the "e" or "-e" option will display environment variables.) On such systems, ps commonly runs with the non-standard options aux, where "a" lists all processes on a terminal, including those of other users, "x" lists all processes without controlling terminals and "u" adds a column for the controlling user for each process. For maximum compatibility, there is no "-" in front of the "aux". "ps auxww" provides complete information about the process, including all parameters.

• Task manager
• kill (command)
• List of Unix commands
• nmon – a system monitor tool for AIX and Linux operating systems
• pstree (Unix)
• lsof

{{Reflist}}

• {{Cite book|author-last=McElhearn|author-first=Kirk|title=The Mac OS X Command Line: Unix Under the Hood|date=2006|publisher=John Wiley & Sons|isbn=978-0470113851}}
• {{Cite book|last1=Shotts (Jr)|first1=William E.|title=The Linux Command Line: A Complete Introduction|date=2012|publisher=No Starch Press|isbn=9781593273897|pages=96–98|url=https://books.google.com/books?id=OCFKdl3wEDIC|access-date=16 October 2017|language=en}}

{{Wikibooks|Guide to Unix|Commands}}

• {{man|cu|ps|SUS}}
• {{man|1|ps|Plan 9}}
• {{man|1|ps|Inferno}}
• [http://www.cyberciti.biz/faq/show-all-running-processes-in-linux/ Show all running processes in Linux using ps command]
• [http://kb.iu.edu/data/afnv.html In Unix, what do the output fields of the ps command mean?]

{{Unix commands}}

{{Plan 9 commands}}

{{lowercase title}}

Category:Unix SUS2008 utilities

Category:Unix process- and task-management-related software

Category:Plan 9 commands

Category:Inferno (operating system) commands

Category:IBM i Qshell commands