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#1
12-14-2009
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Difference between ">/dev/null 2>&1" and "2>&1 >/dev/null"
Does >/dev/null 2>&1 and 2>&1 >/dev/null mean the same?
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#2
12-14-2009
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Hi. They're not the same. In the first case, standard output is directed to a file (in this case /dev/null), and then standard error is directed to the same place (&1, or /dev/null). It's equivalent to Code:
> /dev/null 2> /dev/null In the second case, standard error is directed to where standard output is directed at the time (i.e. the screen), and then standard output is directed to somewhere else (/dev/null) Code:
$ cat Test echo stdout echo stderr >&2 $ ./Test > /dev/null 2>&1 $ $ ./Test 2>&1 > /dev/null stderr |
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#3
12-14-2009
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Then basically ">/dev/null 2>&1" and "&> /dev/null" do the same job i guess??
Last edited by proactiveaditya; 12-14-2009 at 08:50 AM.. |
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#4
12-14-2009
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Quote:
Code:
&> /dev/null Works only in Bash FWIK. |
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#5
12-14-2009
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Code:
[root@wiki ~]# echo "1" &> /dev/null [root@wiki ~]# [root@wiki ~]# ech "1" &> /dev/null [root@wiki ~]# ">/dev/null 2>&1" and "&> /dev/null" does the same job |
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