On Thu, Mar 02, 2006 at 10:23:20AM -0500, Kevin B. McCarty wrote:
> Hi list,
>
> Could someone tell me why the following works in zsh but not in
> bash/posh/dash?
>
> benjo[3]:~% echo foo bar baz | read a b c
> benjo[4]:~% echo $a $b $c
> foo bar baz
>
> If I try the same with bash (or other sh-compatible shells), the
> variables $a $b and $c are unset. From the bash man page:
[...]
> So "read" claims to read from the standard input, but it doesn't
> actually seem to happen when a pipe is involved.
It does happen. However, see the section "Pipelines" in the bash info
page:
A `pipeline' is a sequence of simple commands separated by `|'.
[...]
The output of each command in the pipeline is connected via a pipe
to the input of the next command. That is, each command reads the
previous command's output.
[...]
Each command in a pipeline is executed in its own subshell
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
For some builtin commands this may be useful; for 'read' obviously it is
not.
--
To UNSUBSCRIBE, email to [EMAIL PROTECTED]
with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
