Re: Piping

[Alex Wulms]

] 	cat fudeba.txt | head 20 | tail 10 | less
] 
] 	What is the (best) approach? I think that making 4 fork()/exec() 
] is an extreme waste of system resources. And I don't know how making the
Unix uses the fork()/exec() approach. You can see it if you do the following  in one terminal:
cat  | head -20 | tail -10 | less
and ask for a process tree (for example with pstree in linux) in another  terminal:

bash-+-cat
|-head
|-less
`-tail

You can see that bash has four child processes.

If you think that spawning many processes for a pipe is a waste of resources  on low-end systems like MSX you should use the temporary file approach, just  like MSXDOS and MS-DOS do.

Kind regards,
Alex Wulms
-- 
Alex Wulms/XelaSoft - MSX of anders NIX - Linux 4 ever
See my homepage for info on the  *** XSA *** format
http://www.inter.nl.net/users/A.P.Wulms



**** MSX Mailinglist. To unsubscribe, send an email to [EMAIL PROTECTED] and put in the body (not subject) "unsubscribe msx [EMAIL PROTECTED]" (without the quotes :-) Problems? contact [EMAIL PROTECTED] (www.stack.nl/~wiebe/mailinglist/) ****