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Bash Reference Manual

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3.6.4 Redirecting Standard Output and Standard Error

Bash allows both the standard output (file descriptor 1) and the standard error output (file descriptor 2) to be redirected to the file whose name is the expansion of word with this construct.

There are two formats for redirecting standard output and standard error:
 
&>word
and
 
>&word
Of the two forms, the first is preferred. This is semantically equivalent to
 
>word 2>&1


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