Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: C, UNIX: How to redirect 'stdout' to a file from a C code?
Top Forums Programming C, UNIX: How to redirect 'stdout' to a file from a C code? Post 302983598 by alex_5161 on Thursday 13th of October 2016 04:19:09 PM
Old 10-13-2016
Thank you, jim mcnamara, it is perfectly helps!
Sure here is more than I need in my case, but everything is clear and strait forward!
Additionaly, your code keep a way to switch back that not needed right now, but could be a task later on such approach!

Also I've found useful (by another reply) the 'freopen()' C-function and did it in very simple way, too.
(... for anybody else with the same task and for myself later, here is how I did it with freopen() ) :
Code:
#include <iostream>
#include <fstream>
#include <stdio.h>

using namespace std;

void redir(char* fl_nm)
{
  freopen(fl_nm,"a",stdout);
}

int main()
{
   cout << "starting - by cout\n";
   printf(" this written by printf()\n Following messages shoul go to the file '/tmp/tst_redir.log'\n");

   redir((char*)"/tmp/tst_redir.log");

   cout << ".. By 'cout' after using the redir(): this should be written to the file\n";
   printf(" .. By printf() after 'redir()'...\n");

  return 0;
}

But, again, thanks for your solution!!
 

10 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

problem with redirect stdout to file

Hi all hope you can help as I am going MAD!!! :eek: The below is in a shell script but the redirection in the sed line does not work and outputs to the screen and the $fname_2 does note get created ????? Can any one help ?? #!/bin/ksh cd /app/ for fname in `ls -1 X*` do sed 1d $fname... (3 Replies)
Discussion started by: mlucas
3 Replies

2. UNIX for Advanced & Expert Users

STDOUT redirect to a FILE, when fuser command is used !!

Hi all, I have the following script: ------------------------------------------------- #SCRIPT TO CHECK WHO HAS ACCESSED THE LOG/FILE IN PAST 'N' MINUTES, AND MAIL ACCORDINGLY. MYPATH="/clocal/mqbrkrs/user/mqsiadm/sanjay/" MAIL_RECIPIENTS="vg517@dcx.com" Subject="File accessed in last... (6 Replies)
Discussion started by: varungupta
6 Replies

3. Shell Programming and Scripting

How to redirect stderr and stdout to a file

Hi friends I am facing one problem while redirecting the out of the stderr and stdout to a file let example my problem with a simple example I have a file (say test.sh)in which i run 2 command in the background ps -ef & ls & and now i am run this file and redirect the output to a file... (8 Replies)
Discussion started by: sushantnirwan
8 Replies

4. Programming

redirect stdout

hello again! i use dup2 to redirect stdout. I run what i want, now i want undo this redirection. how can i do that? thanx in advance (7 Replies)
Discussion started by: nicos
7 Replies

5. Shell Programming and Scripting

Redirect stdout/stderr to a file globally

Hi I am not if this is possible: is it possible in bach (or another shell) to redirect GLOBALLY the stdout/stderr channels to a file. So, if I have a script script.sh cmd1 cmd2 cmd3 I want all stdout/stderr goes to a file. I know I can do: ./script.sh 1>file 2>&1 OR ... (2 Replies)
Discussion started by: islegmar
2 Replies

6. Shell Programming and Scripting

redirect STDOUT to a file in a subshell

Hi, I would like to avoid re-directing line by line to a file. What is the best way to re-direct STDOUT to a file in a subshell? Thanks in advance. Cheers Vj (1 Reply)
Discussion started by: tnvee
1 Replies

7. Shell Programming and Scripting

redirect stdout and stderr to file wrong order problem with subshell

Hello I read a lot of post related to this topic, but nothing helped me. :mad: I'm running a ksh script with subshell what processing some ldap command. I need to check output for possible errors. #!/bin/ksh ... readinput < $QCHAT_INPUT |& while read -p line do echo $line ... (3 Replies)
Discussion started by: Osim
3 Replies

8. UNIX for Dummies Questions & Answers

STDOUT redirect to file and format problems

Hi All, I am using centOS. When I try to redirect STDOUT to a file, it ends up in getting some funny characters. For example ... STDOUT of the command as follows. $ ls H3k27me3 H3k36me3 H3k4me1 H3k4me2 H3k4me3 H3k9ac H4k20me1 $ ls >test $ cat test ^ (1 Reply)
Discussion started by: Chulamakuri
1 Replies

9. Shell Programming and Scripting

Redirect STDOUT & STDERR to file and then on screen

Dear all, redirecting STDOUT & STDERR to file is quite simple, I'm currently using: exec 1>>/tmp/tmp.log; exec 2>>/tmp/tmp.logBut during script execution I would like the output come back again to screen, how to do that? Thanks Lucas (4 Replies)
Discussion started by: Lord Spectre
4 Replies

10. Shell Programming and Scripting

Redirect STDOUT & STDERR to file and then on screen

Dear all, redirecting STDOUT & STDERR to file is quite simple, I'm currently using: Code: exec 1>>/tmp/tmp.log; exec 2>>/tmp/tmp.log But during script execution I would like the output come back again to screen, how to do that? Thanks Luc edit by bakunin: please use CODE-tags like the... (6 Replies)
Discussion started by: tmonk1
6 Replies

LEARN ABOUT DEBIAN

solarpowerlog

SOLARPOWERLOG(1)														  SOLARPOWERLOG(1)

NAME

       solarpowerlog - queries data from a photovoltaic inverter

SYNOPSIS

       solarpowerlog [options]

DESCRIPTION

       The program trackd and logd data from photovoltaic inverters, collect power data and store them.

OPTIONS

       The  program  follow the usual GNU command line syntax, with long options starting with two dashes (`-').  A summary of options is included
       below.

       -h, --help
	      Show summary of options.

       -v, --version
	      Show version of program.

       -b, --background
	      Runs the program in the background, detaching it from the console.

       -c, --conf filename
	      The configuration to be used. Default is solarpowerlog.conf, looked for in the current directory.

       --dumpcfg
	      Dump configuration structure, then exit

       --chdir arg
	      working directory for daemon (only used when running as a daemon). Defaults to /

       --stdout arg
	      redirect stdout to this file (only used when running as a daemon). Defaults to /dev/null

       --stderr arg
	      redirect stderr to this file (only used when running as a daemon). Defaults to /dev/null

       --pidfile arg
	      create a pidfile after the daemon has been started.  (only used when running as a daemon). Default: no pid file

SEE ALSO

       http://sourceforge.net/apps/mediawiki/solarpowerlog/index.php

								   June 16, 2009						  SOLARPOWERLOG(1)
All times are GMT -4. The time now is 10:44 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy