1 - denotes stdout ( standard output )
2 - denotes stderr( standard error )
/dev/null . apparently is null , nothing , empty , zero etc , etc .
2>/dev/null - redirect stderr to nothing , it turns stderr off.
>/dev/null 2>&1 also can writeas1>/dev/null 2>&1 - stdout redirect to /dev/null (no stdout) ,and redirect stderr to stdout(stderr gone as well) .end up it turns both stderr and stdout off
a little practice may help to undstand above .
#ls /usr/nothing
#ls /usr/nothing2>/dev/null
#ls /usr/nothing>/dev/null 2>&1
hehe, 清楚的不得了,谢谢各位大虾.
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