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ps -ef -u root -U root

Also displays processes whose user is not root (the current user). Can someone explain me why ?

-u : EUID

-U : RUID
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up vote 8 down vote accepted

Because you use -e option, it causes ps select all processes.

POSIX define ps -e as:

-e
Write information for all processes (Equivalent to -A.)
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Ok, I thought adding a filter would... filter more. Thanks – PerrierCitror Sep 1 '14 at 11:37
    
@PerrierCitror: Use -u and -U alone, they are not combination with -e. – cuonglm Sep 1 '14 at 11:39

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