Sponsored Content
Top Forums Programming A small question about file descriptor Post 302223485 by redoubtable on Sunday 10th of August 2008 04:27:07 PM
Old 08-10-2008
file descriptor 2 is stderr. You can do
Code:
printf ("%d\n", fileno (stderr));

to check

If you're closing stderr, and then fprintf'ing to stderr, you won't get any output.
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

small question

Hi there, I found the following script on the net, i like to use it as a standard template for new scripts. But i do not understand the meaning of the last line, can anybody explain what going on on the last line vflag=off filename= while getopts vf: opt do case "$opt" in v)... (9 Replies)
Discussion started by: janr
9 Replies

2. Shell Programming and Scripting

small question of echo | grep command

Hi, i've got the following: a=`echo $b | grep '^.*/'` i'm storing in the variable the value of the variable b only if it has a / somewhere. It works, but i don't want to print the value. How do i give the value of b to the grep command without the echo? thanks! (5 Replies)
Discussion started by: kfad
5 Replies

3. Shell Programming and Scripting

small question regarding substr()

Hello.. I am doing some awk-ing and among all I use substr inside it.. I have: ....substr($0,60,37) meaning as U all know take from 37 char. from point 60.. can I put it like this substr($0,60,end of line) meaning take it from point 60 and take all characketrs in that line until line... (2 Replies)
Discussion started by: amon
2 Replies

4. Shell Programming and Scripting

A small minix question

First af all hi. i want to create a batch script which inform when users log in last time on system or if they are online when they logged in. I want ot use a file .users which has the usernames of users. i want to print for example peter is ONLINE: Logged in on Wed Feb 11 07:47 alex... (2 Replies)
Discussion started by: sasa
2 Replies

5. UNIX for Dummies Questions & Answers

Small question regarding SSH

I am looking for some model like this: My Computer ------------- Intermediate Server (IS) ------------- Own Server I must be able to ssh into the Intermediate Internet Server which is generally an online version of SSH service through which I will connect to Own Server. I was the IS to... (2 Replies)
Discussion started by: Legend986
2 Replies

6. Shell Programming and Scripting

File Descriptor

Hello All, Im opening a file desciptor in perl and sending data using print CMD "$xyz". is there a limit to the length of the string that I can give to this CMD at a time. (3 Replies)
Discussion started by: rimser9
3 Replies

7. Programming

A small question about fork()

Hello experts, I am using fork() in my code but I am confused which output comes first child or parent? I did the following code .My book shows parent first but my linux shows child first.Can anyone tell me why? #include <stdio.h> int main(){ int pid; printf("I am original process with pid... (5 Replies)
Discussion started by: mlhazan
5 Replies

8. Shell Programming and Scripting

Small fast question

just to confirm du from sh show sizes as multiples of 512 byte right? (4 Replies)
Discussion started by: Nick1097
4 Replies

9. Programming

Ok i have a small assembly question

I have this small program that runs with the flat assembler. My problem is that at the receive line function it receives the line and if there isn't a $ typed at the end of the user input the program displays a lot of strange stuff, sometimes beeps and then it seems to terminate without causing any... (13 Replies)
Discussion started by: Errigour
13 Replies

10. Homework & Coursework Questions

Cat/File Descriptor Question

For the command below, I need to understand what exactly the command does and provide an examples for which the output will be saved to file save2... From my understanding, if the file provides an error in the first half of the pipe, it'll save to save1 and will never give an error to save to... (2 Replies)
Discussion started by: ayz649
2 Replies
OMPI-IOF(1)							     Open MPI							       OMPI-IOF(1)

NAME
ompi-iof, orte-iof - Displays a copy of the output streams from a process. NOTE: ompi-iof, and orte-iof are exact synonyms for each other. Using any of the names will result in exactly identical behavior. SYNOPSIS
ompi-iof [ options ] Options ompi-iof will display a copy of the indicated stdout, stderr, and/or stddiag streams from the designated process. -pid | --pid The pid of the mpirun executing the process whose streams are to be copied -stdout | --stdout Display a copy of the specified process' stdout. If no options are specified, this will act as the default -stderr | --stderr Display a copy of the specified process' stderr. -stddiag | --stddiag Display a copy of the specified process' stddiag. -rank | --rank The rank of the process whose output is to be copied. DESCRIPTION
ompi-iof displays a copy of the indicated stdout, stderr, and/or stddiag streams from the designated process. At this time, a ctrl-C must be used to terminate the program. The program will terminate cleanly, telling the associated mpirun to close the requested streams before exiting. SEE ALSO
orterun(1) 1.4.5 Feb 10, 2012 OMPI-IOF(1)
All times are GMT -4. The time now is 06:46 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy