Python reference

Heiko Wundram heikowu at ceosg.de
Thu Jun 3 22:23:12 CEST 2004


Am Donnerstag, 3. Juni 2004 21:55 schrieb Reiner Block:
> -----------------------------------------------------------------------
> import os
> os.spawnlp(os.P_WAIT, 'cp', 'cp', 'index.html', '/dev/null')
> -----------------------------------------------------------------------

First and second parameter are clear to you, you say. Okay, let's start from 
there: third parameter is the first parameter the program gets to see. What 
is the first parameter of a program (sys.argv[0])? That's the program name! 
Fourth parameter, and fifth should be clear, anyhow.

Try this:

os.spawnlp(os.P_WAIT,'cp','gugu','nonexistant','neitherexistant')

The output you'll see on the console is:

gugu: Aufruf von stat für ,,nonexistant" nicht möglich: Datei oder Verzeichnis 
nicht gefunden

So, cp does as it should, the program name which is output (in case you called 
a symlink or something, it can reference you to the symlink, and doesn't 
always print cp) is the first parameter to the program we passed in.

HTH!

Heiko.




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