ps -fA|grep postgres
PS(1) User Commands PS(1)
NAME
ps - report a snapshot of the current processes.
SYNOPSIS
ps [options]
DESCRIPTION
ps displays information about a selection of the active processes. If you want a repetitive update of the selection
and the displayed information, use top(1) instead.
This version of ps accepts several kinds of options:
1 UNIX options, which may be grouped and must be preceded by a dash.
2 BSD options, which may be grouped and must not be used with a dash.
3 GNU long options, which are preceded by two dashes.
Options of different types may be freely mixed, but conflicts can appear. There are some synonymous options, which
are functionally identical, due to the many standards and ps implementations that this ps is compatible with.
Note that "ps -aux" is distinct from "ps aux". The POSIX and UNIX standards require that "ps -aux" print all
processes owned by a user named "x", as well as printing all processes that would be selected by the -a option. If
the user named "x" does not exist, this ps may interpret the command as "ps aux" instead and print a warning. This
behavior is intended to aid in transitioning old scripts and habits. It is fragile, subject to change, and thus
should not be relied upon.
By default, ps selects all processes with the same effective user ID (euid=EUID) as the current user and associated
with the same terminal as the invoker. It displays the process ID (pid=PID), the terminal associated with the
process (tname=TTY), the cumulated CPU time in [DD-]hh:mm:ss format (time=TIME), and the executable name (ucmd=CMD).
Output is unsorted by default.
The use of BSD-style options will add process state (stat=STAT) to the default display and show the command args
(args=COMMAND) instead of the executable name. You can override this with the PS_FORMAT environment variable. The
use of BSD-style options will also change the process selection to include processes on other terminals (TTYs) that
are owned by you; alternately, this may be described as setting the selection to be the set of all processes filtered
to exclude processes owned by other users or not on a terminal. These effects are not considered when options are
described as being "identical" below, so -M will be considered identical to Z and so on.
Except as described below, process selection options are additive. The default selection is discarded, and then the
selected processes are added to the set of processes to be displayed. A process will thus be shown if it meets any
of the given selection criteria.
EXAMPLES
To see every process on the system using standard syntax:
ps -e
ps -ef
ps -eF
ps -ely
To see every process on the system using BSD syntax:
ps ax
ps axu
To print a process tree:
ps -ejH
ps axjf
To get info about threads:
ps -eLf
ps axms
To get security info:
ps -eo euser,ruser,suser,fuser,f,comm,label
ps axZ
ps -eM
To see every process running as root (real & effective ID) in user format:
ps -U root -u root u
To see every process with a user-defined format:
ps -eo pid,tid,class,rtprio,ni,pri,psr,pcpu,stat,wchan:14,comm
ps axo stat,euid,ruid,tty,tpgid,sess,pgrp,ppid,pid,pcpu,comm
ps -Ao pid,tt,user,fname,tmout,f,wchan
Print only the process IDs of syslogd:
ps -C syslogd -o pid=
Print only the name of PID 42:
ps -p 42 -o comm=
SIMPLE PROCESS SELECTION
a Lift the BSD-style "only yourself" restriction, which is imposed upon the set of all processes when some
BSD-style (without "-") options are used or when the ps personality setting is BSD-like. The set of processes
selected in this manner is in addition to the set of processes selected by other means. An alternate
description is that this option causes ps to list all processes with a terminal (tty), or to list all
processes when used together with the x option.
-A Select all processes. Identical to -e.
-a Select all processes except both session leaders (see getsid(2)) and processes not associated with a terminal.
-d Select all processes except session leaders.
--deselect
Select all processes except those that fulfill the specified conditions (negates the selection). Identical to
-N.
-e Select all processes. Identical to -A.
g Really all, even session leaders. This flag is obsolete and may be discontinued in a future release. It is
normally implied by the a flag, and is only useful when operating in the sunos4 personality.
-N Select all processes except those that fulfill the specified conditions (negates the selection). Identical to
--deselect.
T Select all processes associated with this terminal. Identical to the t option without any argument.
r Restrict the selection to only running processes.
x Lift the BSD-style "must have a tty" restriction, which is imposed upon the set of all processes when some
BSD-style (without "-") options are used or when the ps personality setting is BSD-like. The set of processes
selected in this manner is in addition to the set of processes selected by other means. An alternate
description is that this option causes ps to list all processes owned by you (same EUID as ps), or to list all
processes when used together with the a option.
PROCESS SELECTION BY LIST
These options accept a single argument in the form of a blank-separated or comma-separated list. They can be used
multiple times. For example: ps -p "1 2" -p 3,4
-123 Identical to --pid 123.
123 Identical to --pid 123.
-C cmdlist
Select by command name. This selects the processes whose executable name is given in cmdlist.
-G grplist
Select by real group ID (RGID) or name. This selects the processes whose real group name or ID is in the
grplist list. The real group ID identifies the group of the user who created the process, see getgid(2).
-g grplist
Select by session OR by effective group name. Selection by session is specified by many standards, but
selection by effective group is the logical behavior that several other operating systems use. This ps will
select by session when the list is completely numeric (as sessionsare). Group ID numbers will work only when
some group names are also specified. See the -s and --group options.
--Group grplist
Select by real group ID (RGID) or name. Identical to -G.
--group grplist
Select by effective group ID (EGID) or name. This selects the processes whose effective group name or ID is
in grouplist. The effective group ID describes the group whose file access permissions are used by the
process (see getegid(2)). The -g option is often an alternative to --group.
p pidlist
Select by process ID. Identical to -p and --pid.
-p pidlist
Select by PID. This selects the processes whose process ID numbers appear in pidlist. Identical to p and
--pid.
--pid pidlist
Select by process ID. Identical to -p and p.
--ppid pidlist
Select by parent process ID. This selects the processes with a parent process ID in pidlist. That is, it
selects processes that are children of those listed in pidlist.
-s sesslist
Select by session ID. This selects the processes with a session ID specified in sesslist.
--sid sesslist
Select by session ID. Identical to -s.
t ttylist
Select by tty. Nearly identical to -t and --tty, but can also be used with an empty ttylist to indicate the
terminal associated with ps. Using the T option is considered cleaner than using t with an empty ttylist.
-t ttylist
Select by tty. This selects the processes associated with the terminals given in ttylist. Terminals (ttys,
or screens for text output) can be specified in several forms: /dev/ttyS1, ttyS1, S1. A plain "-" may be used
to select processes not attached to any terminal.
--tty ttylist
Select by terminal. Identical to -t and t.
U userlist
Select by effective user ID (EUID) or name. This selects the processes whose effective user name or ID is in
userlist. The effective user ID describes the user whose file access permissions are used by the process (see
geteuid(2)). Identical to -u and --user.
-U userlist
Select by real user ID (RUID) or name. It selects the processes whose real user name or ID is in the userlist
list. The real user ID identifies the user who created the process, see getuid(2).
-u userlist
Select by effective user ID (EUID) or name. This selects the processes whose effective user name or ID is in
userlist.
The effective user ID describes the user whose file access permissions are used by the process (see
geteuid(2)). Identical to U and --user.
--User userlist
Select by real user ID (RUID) or name. Identical to -U.
--user userlist
Select by effective user ID (EUID) or name. Identical to -u and U.
OUTPUT FORMAT CONTROL
...
see man ps
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