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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