Sponsored Content
Top Forums UNIX for Dummies Questions & Answers Pipe not taken into consideration Post 302069958 by panchopp on Thursday 30th of March 2006 11:58:52 AM
Old 03-30-2006
Txs, it works perfectly. Quick question:
If I understand correctly, with
Code:
>/dev/null

you are throwing the error output to the trash, correct? But what is the "2" about? could not find it in the manual.
Cheers,
panchopp.
 

9 More Discussions You Might Find Interesting

1. Programming

pipe help

i made a lot of processes. here is the code: main() { printf("\nEnter K="); scanf("%d",&k); printf("Enter L="); scanf("%d",&l); printf("\nFather id=%d\n",getpid()); x=0; makechild(); sleep(2); return 1; } int makechild() { for(q=1;q<=k;q++) { if(f=fork()) { ... (5 Replies)
Discussion started by: bb666
5 Replies

2. Shell Programming and Scripting

pipe | question

how do you pipe the results to next statement as argument? somecommand | grep $result somefile how do you reference $result with?? (12 Replies)
Discussion started by: convenientstore
12 Replies

3. Programming

Gcc with pipe

I want to compile all files in my directory i wrote find *.c | gcc -o * *.c but it dosent work :( Help pliz (12 Replies)
Discussion started by: rzili
12 Replies

4. Shell Programming and Scripting

How can I use pipe

Hi, guys: I am working on my shell using c. How can I use pipe to implement the following? ls -l 1>> | grep hellp 1<< 2>> | less 2<< (the output of ls goes to grep, and the output of grep goes to less) Thanks Please use and tags when posting code, data or logs etc. to preserve... (1 Reply)
Discussion started by: tomlee
1 Replies

5. Shell Programming and Scripting

Replace pipe with Broken Pipe

Hi All , Is there any way to replace the pipe ( | ) with the broken pipe (0xA6) in unix (1 Reply)
Discussion started by: saj
1 Replies

6. Shell Programming and Scripting

How to use an input pipe ?

Hi all, I would like to use properly an input pipe, like this : cat myFile.txt | myCommand.shI always find this solution : while read line; do ...; donebut I have a great lost of performance ! On a big file, with a simple grep, I can spend 2400 times more time ! oO (from 0,023sec to 1m)... (4 Replies)
Discussion started by: LeNouveau
4 Replies

7. Shell Programming and Scripting

Pipe and fgrep

Hi , Please help me resolve the below issue. I need to combine the below two command into one. grep 'ImanItemP' import.report| tr -s ' ' | cut -f2 -d ' ' > tmp.txt fgrep -v -f tmp.txt input.txt > reuired file.txt Thanks Ramesh (4 Replies)
Discussion started by: ramesh12621
4 Replies

8. Shell Programming and Scripting

Pipe Functionality

Hi, I am trying to emulate the '|' functionality through pipe function call. I am passing the o/p of exec in parent as input to the exec in child. The buf is readin the o/p but the exec in child is not working. Can somebody checkout the code and point where am i going wrong or missing something.... (3 Replies)
Discussion started by: amejoish
3 Replies

9. Shell Programming and Scripting

How to ignore Pipe in Pipe delimited file?

Hi guys, I need to know how i can ignore Pipe '|' if Pipe is coming as a column in Pipe delimited file for eg: file 1: xx|yy|"xyz|zzz"|zzz|12... using below awk command awk 'BEGIN {FS=OFS="|" } print $3 i would get xyz But i want as : xyz|zzz to consider as whole column... (13 Replies)
Discussion started by: rohit_shinez
13 Replies
IO::Pipe(3pm)						 Perl Programmers Reference Guide					     IO::Pipe(3pm)

NAME
IO::Pipe - supply object methods for pipes SYNOPSIS
use IO::Pipe; $pipe = IO::Pipe->new(); if($pid = fork()) { # Parent $pipe->reader(); while(<$pipe>) { ... } } elsif(defined $pid) { # Child $pipe->writer(); print $pipe ... } or $pipe = IO::Pipe->new(); $pipe->reader(qw(ls -l)); while(<$pipe>) { ... } DESCRIPTION
"IO::Pipe" provides an interface to creating pipes between processes. CONSTRUCTOR
new ( [READER, WRITER] ) Creates an "IO::Pipe", which is a reference to a newly created symbol (see the "Symbol" package). "IO::Pipe::new" optionally takes two arguments, which should be objects blessed into "IO::Handle", or a subclass thereof. These two objects will be used for the system call to "pipe". If no arguments are given then method "handles" is called on the new "IO::Pipe" object. These two handles are held in the array part of the GLOB until either "reader" or "writer" is called. METHODS
reader ([ARGS]) The object is re-blessed into a sub-class of "IO::Handle", and becomes a handle at the reading end of the pipe. If "ARGS" are given then "fork" is called and "ARGS" are passed to exec. writer ([ARGS]) The object is re-blessed into a sub-class of "IO::Handle", and becomes a handle at the writing end of the pipe. If "ARGS" are given then "fork" is called and "ARGS" are passed to exec. handles () This method is called during construction by "IO::Pipe::new" on the newly created "IO::Pipe" object. It returns an array of two objects blessed into "IO::Pipe::End", or a subclass thereof. SEE ALSO
IO::Handle AUTHOR
Graham Barr. Currently maintained by the Perl Porters. Please report all bugs to <perlbug@perl.org>. COPYRIGHT
Copyright (c) 1996-8 Graham Barr <gbarr@pobox.com>. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.16.2 2012-10-11 IO::Pipe(3pm)
All times are GMT -4. The time now is 05:34 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy