Login or Register to Ask a Question and Join Our Community


Programming

redirect stdout

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Programming redirect stdout
# 1  
Old 01-12-2009
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
# 2  
Old 01-13-2009
Just close the file descriptor. You can then reopen for stdout/stderr whatever using dup2 again.
# 3  
Old 01-14-2009
Quote:
Originally Posted by otheus
Just close the file descriptor. You can then reopen for stdout/stderr whatever using dup2 again.
i did it, but i does not work!! can u help me?thanx anyway!
# 4  
Old 01-14-2009
Quote:
Originally Posted by nicos
I did it, but it does not work! Can you help me? Thanks anyway!
Could you show your code? We can't tell what's going wrong when we can't see what you're doing. Be sure to put it in code tags. like [ code ] [ /code ] but without the extra spaces.
# 5  
Old 01-15-2009
Quote:
Originally Posted by Corona688
Could you show your code? We can't tell what's going wrong when we can't see what you're doing. Be sure to put it in code tags. like
i write this code to redirect stdout and stderr
dup2(fd2,STDOUT_FILENO);
dup2(fd1,STDERR_FILENO);//redirection of stdout and stderr in parent
close(fd2);close(fd1);
# 6  
Old 01-15-2009
And what do you do to put them back?
# 7  
Old 01-15-2009
Quote:
Originally Posted by Corona688
And what do you do to put them back?
i haven't manage to find a correct code yet.
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Programming

C, UNIX: How to redirect 'stdout' to a file from a C code?

I am looking for a way to redirect standard output to a file from a C-code; so, any 'cout<<..' or 'printf(...)' will be written into a file. I have a server source that I need to debug. That program called by RPC (remote procedure call) and has no any session to print out anything. I have... (3 Replies)
Discussion started by: alex_5161
3 Replies

2. Shell Programming and Scripting

Bizzare behavior on redirect of stdout

Oracle Linux 5.6 64-bit (derivative of RHEL) Dear Ann Landers, This is about as bizarre as anything I've ever seen. I have a little test script I've been working with. When I redirect stdout to a file, no file. Make a copy of the script to another name. Execute it and redirect stdout, and... (4 Replies)
Discussion started by: edstevens
4 Replies

3. 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

4. Red Hat

Redirect STDOUT and STDERR of chsh

EDIT: Nevermind, figured it out! Forgot to put backslashes in my perl script to not process literals! Hi everyone. I am trying to have this command pass silently. (no output) chsh -s /bin/sh news Currently it outputs. I've tried.... &> /dev/null 1> /dev/null 2>&1 /dev/null 1>&2... (1 Reply)
Discussion started by: austinharris43
1 Replies

5. 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

6. 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

7. Programming

how to redirect back to stdout

In my program, I am using library provided by other. In the library, the cout/cerr is redirected to a file (the file path is known). After I call some methods in the library, I get one side-effect --> The cout/cerr in my own program is also directed to the file. So how can I to redirect... (5 Replies)
Discussion started by: princelinux
5 Replies

8. 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

9. 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

10. Shell Programming and Scripting

Redirect stdout and stderr

How can I redirect and append stdout and stderr to a file when using cron? Here is my crontab file: */5 * * * * /dir/php /dir/process_fns.php >>& /dir/dump.txt Cron gives me an 'unexpected character found in line' when trying to add my crontab file. Regards, Zach Curtis POPULUS (8 Replies)
Discussion started by: zcurtis
8 Replies
Login or Register to Ask a Question