System administration

Linux ps command

Show a snapshot of processes. This format lists processes for all users.

Availability: Common Linux commands; shell built-ins and external implementations may differ by distribution.中文

Syntax

ps [OPTION]...

Examples

Show processes ordered by memory use.

ps aux --sort=-%mem | head

Show selected fields for process 1234.

ps -p 1234 -o pid,ppid,stat,cmd

Parameters, options and clauses

Option / clause	Description
`-e, -A`	Select all processes.
`-f`	Use full-format listing.
`-u USER`	Select processes for USER and show user-oriented format.
`-p PIDLIST`	Select processes by process ID.
`--sort=KEY`	Sort output by a process field (implementation-specific keys).
`aux / -ef`	Common BSD-style / UNIX-style process listings.

Safety note

Review a command and its target before running it. Commands that alter files, services, accounts, disks, permissions or databases may be difficult to reverse. Test in a safe environment and keep backups.

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