Why does ps used with grep always return an output at least of one line?
Issue
- Why does
psused withgrepalways return an output at least of one line?
# ps aux | grep sleep
root 5334 0.0 0.0 112640 960 pts/0 S+ 09:37 0:00 grep --color=auto sleep
# echo $?
0
Environment
- Red Hat Enterprise Linux 5/6/7
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