On 06 August 2003 15:19, Jason Wong wrote:

> On Wednesday 06 August 2003 21:29, Nicolas Frisby wrote:
> 
> > Regardless of that, do you know anything of how the piping mechanism
> > works?
> 
> Not really. I do know that what you're trying to do doesn't work for
> bash scripts either. IE you cannot use a pipe to pass command line
> arguments to a bash script, nor a php script.

Well, no -- command line arguments are not STDIN, as a general rule.  That's
why they're passed separately in argc, argv.

When you pipe one process into another:

   x | y

the standard output (STDOUT) of x is "piped" directly into the standard
input (STDIN) of y -- so whatever x sends to STDOUT, y will see on STDIN.
The mechanics of this aren't really important (although commonly x's STDOUT
is written to a tempfile, which y's STDIN is then read from), so long as you
understand the principles of it.

Cheers!

Mike

---------------------------------------------------------------------
Mike Ford,  Electronic Information Services Adviser,
Learning Support Services, Learning & Information Services,
JG125, James Graham Building, Leeds Metropolitan University,
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Email: [EMAIL PROTECTED]
Tel: +44 113 283 2600 extn 4730      Fax:  +44 113 283 3211 

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