Pstree Command--linux command application of large dictionary 729 commands interpretation

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Pstree Command

use the pstree command to display the process tree of a running process. the pstree command Displays the tree structure in ASCII characters, clearly expressing the interrelationships between processes. If you do not specify a process number or user name, the first process at system startup is considered to be the base and all subsequent processes are displayed. If you specify a user name, the first process that belongs to that user is treated as a grass root and then all processes for that user are displayed.

Command syntax:

pstree[ Options ] [ process number | User ]

The meanings of the options in the command are as follows is shown.

table pstree command options meaning

Options	Meaning
-A	Display command line arguments
-A	Use ASCII Draw line character
-C	Do not compress identical subtrees
-H	Highlight the current process and its ancestors
-H < process number >	Highlight process number specified by process when its ancestor
-G	Use VT100 Dash character
-L	Do not truncate long lines
-N	Output sorted by process number
-P	Show process number
-U	Display user name transformations
-U	Use UTF-8(Unicode) dash character
-Z	Show SELinux Security Environment

Example : View the process tree.

[[Email protected]~]# pstree

Init─┬─networkmanager

├─abrtd

├─acpid

├─anacron

├─atd

├─AUDITD───{AUDITD}

├─automount───4*[{automount}]

├─bonobo-activati───{bonobo-activat}

├─certmonger

├─clock-applet

├─CONSOLE-KIT-DAE───63*[{CONSOLE-KIT-DA}]

├─crond

├─cupsd

├─2*[dbus-daemon───{dbus-daemon}]

├─2*[dbus-launch]

├─devkit-power-da

├─gconf-im-settin

├─gconfd-2

........................ (omitted)

Example : View the process tree and display the process number.

[[Email protected]~]# pstree-p

Init (1) ─┬─networkmanager (1427)

├─ABRTD (1771)

├─acpid (1544)

├─ATD (1790)

├─AUDITD (2101) ───{AUDITD} (2102)

├─automount (1625) ─┬─{automount} (1626)

│├─{automount} (1627)

│├─{automount} (1630)

│└─{automount} (1633)

├─bonobo-activati (2245) ───{bonobo-activat} (2246)

├─certmonger (1816)

├─clock-applet (2278)

├─console-kit-dae (1946) ─┬─{console-kit-da} (1947)

│├─{console-kit-da} (1948)

│├─{console-kit-da} (1949)

│├─{console-kit-da} (1950)

│├─{console-kit-da} (1951)

│├─{console-kit-da} (1952)

│├─{console-kit-da} (1953)

........................ (omitted)

Example : View The process name for the process number 1779 .

[[Email protected]~]# pstree 1779

Crond

Example : View The process of the GDM user.

[Email protected] ~]# Pstree GDM

Dbus-launch

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Pstree Command--linux command application of large dictionary 729 commands interpretation