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This article introduces you how to understand the operation of grep, the content is very detailed, interested friends can refer to, hope to be helpful to you.

[root@irac01 ~] # ps-ef | grep '2034\ | 2035\ | 2005\ | 2037'

Gdm 2005 1 0 Apr17? 00:00:12 / usr/libexec/gconfd-2

Gdm 2034 1998 0 Apr17? 00:00:17 metacity

Gdm 2035 1998 0 Apr17? 00:01:15 / usr/libexec/gdm-simple-greeter

Gdm 2037 1998 0 Apr17? 00:00:20 gnome-power-manager

Root 2060 985 0 11:07 pts/2 00:00:00 grep 2034\ | 2035\ | 2005\ | 2037

[root@irac01 ~] # ps-ef | grep-E "2034 | 2035 | 2005 | 2037"

Gdm 2005 1 0 Apr17? 00:00:12 / usr/libexec/gconfd-2

Gdm 2034 1998 0 Apr17? 00:00:17 metacity

Gdm 2035 1998 0 Apr17? 00:01:15 / usr/libexec/gdm-simple-greeter

Gdm 2037 1998 0 Apr17? 00:00:20 gnome-power-manager

Root 2062 985 0 11:07 pts/2 00:00:00 grep-E 2034 | 2035 | 2005 | 2037

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