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UNIX for Dummies Questions & Answers
redirection stdin
Post 302400598 by vgersh99 on Wednesday 3rd of March 2010 04:28:08 PM
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Hi
I am doing file redirection at console for use by my binary.
%console%> bin < inputfile
After reading in the entire file, I want my program to continue taking input from the console. So essentially I want to redirect stdin back to console. But I cant figure out how to do it.
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hi,
how does a program know whether some data are available from stdin?
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can you redirect STDIN with command arguments?
I have tried this approach:
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# $2: ambiguous redirect
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6. Programming
Hi,
Program A: uses pipe()
I am able to read the stdout of PROGAM B (stdout got through system() command) into PROGRAM A using:
* child
-> dup2(fd, STDOUT_FILENO);
-> execl("/path/PROGRAM B", "PROGRAM B", NULL);
* parent
-> char line;
-> read(fd, line, 100);
Question:
---------... (1 Reply)
Discussion started by: vvaidyan
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Hi,
Program A: uses pipe()
I am able to read the stdout of PROGAM B (stdout got through system() command) into PROGRAM A using:
* child
-> dup2(fd, STDOUT_FILENO);
-> execl("/path/PROGRAM B", "PROGRAM B", NULL);
* parent
-> char line;
-> read(fd, line, 100);
Question:
---------... (3 Replies)
Discussion started by: vvaidyan
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8. UNIX for Dummies Questions & Answers
When a process fork(), the child share the same file descriptors as his father. Thus, they share the same stdin. Quick and dirty exemple below (sorry for the ugly gets() call) :
#include <stdio.h>
#include <unistd.h>
int main()
{
char buf;
if (fork()) { /*parent */
... (1 Reply)
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Hi
I'm trying to do something on the bash command line that I will later put into a bash shell script.
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Hello,
my C application under unix runs in redirecting stdin to a file.
Example:$appli1 <file1. This application waits often on a scanf().
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LEARN ABOUT DEBIAN
dpipe
DPIPE(1) General Commands Manual DPIPE(1) NAME
dpipe - bi-directional pipe command SYNOPSIS
dpipe [ command [ args ] ] = [ command [ args ] ] dpipe [ command [ args ] ] = [ command [ args ] ] [ = [ command [ args ] ] ] ... DESCRIPTION
dpipe is a general tool to run two commands diverting the standard output of the first command into the standard input of the second and vice-versa. It is the bi-directional extension of the | (pipe) syntax used by all the shells. The = has been chosen as a metaphor of two parallel communication lines between the commands. It is also possible to concatenate several tools. Intermediate programs communicate using standard input and standard output with the preceding tool and alternate standard input and output (respectively file descriptors number 3 and 4) towards the following tool. If an intermediate tool should process only the data flowing in one direction use { or } as suffix for the preceding = and prefix of the following one. This tool has been written as a tool for the Virtual Distributed Ethernet. EXAMPLE
dpipe a = b processes a and b are bidirectionally connected: stdin of a is connected to stdout of b and vice-versa dpipe a = b = c a and b are connected as above. Alternate stdin of b is connected to stdout of c and alternate stdout of b to stdin of c dpipe a =} b }= c This is a cycle of pipes: stdout of a is connected to stdin of b, stdout of b with stdin of c, and stdout of c to stdin of a dpipe a =} b }={ c {= d = e all the notations can be mixed together. this is a -> b -> d -> c and back to a; alternate ports of d are connected to e OPTIONS
no options. NOTICE
Virtual Distributed Ethernet is not related in any way with www.vde.com ("Verband der Elektrotechnik, Elektronik und Informationstechnik" i.e. the German "Association for Electrical, Electronic & Information Technologies"). SEE ALSO
vde_switch(1), vde_plug(1), vde_plug2tap(1), vdeq(1). wirefilter(1). AUTHOR
VDE is a project by Renzo Davoli <renzo@cs.unibo.it>. Virtual Distributed Ethernet December 6, 2006 DPIPE(1)