man bash:
REDIRECTION
Before a command is executed, its input and output may be
redirected using a special notation interpreted by the
shell. Redirection may also be used to open and close
files for the current shell execution environment. The
following redirection operators may precede or appear any-
where within a simple command or may follow a command.
Redirections are processed in the order they appear, from
left to right.
In the following descriptions, if the file descriptor num-
ber is omitted, and the first character of the redirection
operator is <, the redirection refers to the standard
input (file descriptor 0). If the first character of the
redirection operator is >, the redirection refers to the
standard output (file descriptor 1).
The word following the redirection operator in the follow-
ing descriptions, unless otherwise noted, is subjected to
brace expansion, tilde expansion, parameter expansion,
command substitution, arithmetic expansion, quote removal,
pathname expansion, and word splitting. If it expands to
more than one word, bash reports an error.
Note that the order of redirections is significant. For
example, the command
ls > dirlist 2>&1
directs both standard output and standard error to the
file dirlist, while the command
ls 2>&1 > dirlist
directs only the standard output to file dirlist, because
the standard error was duplicated as standard output
before the standard output was redirected to dirlist.
...
Mugurel
În data de 18-04-2002, la 12h 49'40", Nestor Dan scria despre "[rlug] Re:
Top pe /dev/tty11":
> pentru newbies de pe lista, ai putea sa explici ce
> inseamna 2>&1 ?? am vazut multe comenzi care includ
> chestia asta si nu stiu ce inseamna.
>
> 10x
> Dannutz
>
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