Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: File Descriptor redirection and duplication
Top Forums UNIX for Advanced & Expert Users File Descriptor redirection and duplication Post 302399959 by thillai_selvan on Tuesday 2nd of March 2010 03:12:44 AM
Old 03-02-2010
generally the errors will be printed to the stderr.
In the first case at first you are redirecting the output to logfile file directly.
At this stage both the stdout and stderr are redirect to the logfile.
Then only redirecting the stderr to stdout.

(0 for stdin, 1 for stdout and 2 for stderr)

In the second case you are redirecting the stderr to the stdout.
So the error message is getting printed in the stderr and the stdout is redirected to the logfile.
So the output is stored in the logfile.
Last edited by thillai_selvan; 03-02-2010 at 04:18 AM..
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

file activity (open/closed) file descriptor info using KORN shell scripting

I am trying to find a way to check the current status of a file. Such as some cron job processes are dependent on the completion of others. if a file is currently being accessed / modified or simply open state I will wait until it is done being processed before attempting the next process on that... (3 Replies)
Discussion started by: Gary Dunn
3 Replies

2. Windows & DOS: Issues & Discussions

File Duplication

hi all how to find the file duplication in a windows 2000 server as usual replies are sincerely appreciated. thanks raguram R (3 Replies)
Discussion started by: raguramtgr
3 Replies

3. UNIX for Dummies Questions & Answers

File Descriptor Help

What is a file descriptor in Unix?? How to find a file descriptor of a file in Unix?? Does it have anything to do with the Inode numbers?? (3 Replies)
Discussion started by: rahulrathod
3 Replies

4. 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

5. UNIX for Dummies Questions & Answers

File Descriptor

Hi What the below path contains? /proc/<pid>/fd (1 Reply)
Discussion started by: siba.s.nayak
1 Replies

6. Shell Programming and Scripting

File Duplication Script?

I have a file, let's say 1.jpg, and I have a text file that contains a list of filenames I would like to duplicate 1.jpg as (i.e., 2.jpg, 3.jpg, 4.jpg, etc.). The filenames that I want to create are all on separate lines, one per line. I'm sure there's a simple solution, but I'm not claiming to... (7 Replies)
Discussion started by: futurestar
7 Replies

7. Shell Programming and Scripting

Why stderr file descriptor redirection makes ksh's "select" construct hang.

I am trying to use one global declaration --> "exec 2>$ERR" to capture all stderr outputs that may occur anywhere in my script. Then close it at the end of the script using --> "exec 2<&-" I am using KSH on Solaris 8. KSH Version M-11/16/88i If I comment two "exec .." statements in the... (11 Replies)
Discussion started by: kchinnam
11 Replies

8. Shell Programming and Scripting

Help with File Descriptor in a While loop

Hi, I am trying to read a file line-by-line in a while loop, and perform some tasks which involves non-interactive SSH to a remote server. The code looks something like this -- #!/usr/bin/ksh export myFile=/path/to/my/file.load while read line do do something ## Adding the SSH... (2 Replies)
Discussion started by: Subu1987
2 Replies

9. Shell Programming and Scripting

Variable File Descriptor

Greetings. I am happily using constructs like the following; I have set -x to show fine distinctions. $ exec 4> afile + exec + 4> afile $ print -u4 This is the first line in afileAs you can see from the -x expansion, the shell performed the exec command and redirected file descriptor to... (4 Replies)
Discussion started by: rpaskudniak
4 Replies

10. UNIX for Beginners Questions & Answers

UNIX Log File Content - Duplication Issue

I have a shell script with 2 run time arguments. During the execution if i got any error, then it needs to redirected to a error file and in console. Also both error and output to be redirected to a log file. Error output is getting copied to err file and getting displayed in console too. But... (2 Replies)
Discussion started by: sarathy_a35
2 Replies

LEARN ABOUT DEBIAN

orte-iof

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 08:11 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy