What is /dev/null 2>&1?
2024-08-28 08:35:00
>> /dev/null
redirects standard output (stdout
) to /dev/null
, which discards it.
(The >>
seems sort of superfluous, since >>
means append while >
means truncate and write, and either appending to or writing to /dev/null
has the same net effect. I usually just use >
for that reason.)
2>&1
redirects standard error (2
) to standard output (1
), which then discards it as well since standard output has already been redirected.
转自: http://stackoverflow.com/questions/10508843/what-is-dev-null-21
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