redirect the audio output to /dev/null Post: 302688153

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1. Shell Programming and Scripting

redirect stderr to dev/null in bash env.

Working in a bash environment, in the following example, how do I direct the error message that putting in an invalid flag (-j for example) would normally produce to dev/null? while getopts "abcd" opt do case "$opt" in i) a etc ;; r) b etc ;; f) c etc ;; v) d...

2. Solaris

URGENT - setup port and dump all output to /dev/null or a file

Please help urgently. I need to setup up some sort of service on a solaris server on a port. I dont need it do anything special, anything that is sent to this port from an external server should be dump to /dev/null or a flat file.. Can you help urgently?

3. UNIX for Dummies Questions & Answers

redirect stderr and/or stdout to /dev/null from command line

Is it possible to redirect errors at the command line when you run the script such as bash scriptname & 2>/dev/null?

4. Shell Programming and Scripting

How to redirect the import log to /dev/null?

Hi i am running oracle database import through a script and script scans the import log to see if there are any errors. Now the porblem is that when i run the script the import log appears on the screen even if i direct the output of import to /dev/null. imp "'/ as sysdba'"...

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cp output /dev/null results in not a directory

Hello, I am working on a script to measure the read performance of a busybox environment. The logical choice is to use a command line like: (time cp * /dev/null) 2> /tmp/howlong.txt Ah, the rub is cp or /dev/null will only accept a single file at a time. The result in the txt file is and...

6. Ubuntu

tar not reading if output directed to /dev/null

I stumbled across a somewhat strange behavior of tar and find no explanation for it: i was testing a DVD for read errors and thought to simply tar the content and direct the output to /dev/null: tar -cvf - /my/mountpoint/*ts > /dev/null This way i expected the system to read the complete...

7. Shell Programming and Scripting

Error output of cat to /dev/null

Hello, I'm trying to send the error output of a 'cat' operation to /dev/null like this: cat /dirA/dirB/temp*.log > /dirA/dirB/final.log 2>/dev/null This works perfectly in a terminal, but not when placed in a script. If there are no files matching temp*.log the script outputs an error...

8. UNIX for Dummies Questions & Answers

/dev/null 2>&1 Versus /dev/null 2>1

How are these two different? They both prevent output and error from being displayed. I don't see the use of the "&" echo "hello" > /dev/null 2>&1 echo "hello" > /dev/null 2>1

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Redirect system output to null in perl

Hi Guys, Please help me.. it is urgent. I am writing a perl script to capture command output and redirect it to a logfile.At the same i want to check the return code of the command and log it if the command is not succesful in my logfile.. Here is my code, it is working but system command inside...

10. UNIX for Dummies Questions & Answers

Redirect Standard Error to /dev/null is not working.

Hello. When I run a .ksh that contains the command below, and there is no file available in the source location the "FILE_NAME_*.CSV not found" error is still being displayed. FILEN=$(ssh ${SOURCE_SERV} "cd ${SOURCE_LOCATION} ;ls ${FILES}") 2> /dev/null. This is interfering with the rest...

LEARN ABOUT NETBSD

daemon

DAEMON(3)						   BSD Library Functions Manual 						 DAEMON(3)

NAME

     daemon -- run in the background

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <stdlib.h>

     int
     daemon(int nochdir, int noclose);

DESCRIPTION

     The daemon() function is for programs wishing to detach themselves from the controlling terminal and run in the background as system daemons.

     Unless the argument nochdir is non-zero, daemon() changes the current working directory to the root (/).

     Unless the argument noclose is non-zero, daemon() will redirect standard input, standard output and standard error to /dev/null.

RETURN VALUES

     On return 0 indicates success with -1 indicating error.

ERRORS

     The function daemon() may fail and set errno for any of the errors specified for the library functions fork(2) and setsid(2).

SEE ALSO

     fork(2), setsid(2)

HISTORY

     The daemon() function first appeared in 4.4BSD.

CAVEATS

     Unless the noclose argument is non-zero, daemon() will close the first three file descriptors and redirect them to /dev/null.  Normally,
     these correspond to standard input, standard output and standard error.  However, if any of those file descriptors refer to something else
     they will still be closed, resulting in incorrect behavior of the calling program.  This can happen if any of standard input, standard output
     or standard error have been closed before the program was run.  Programs using daemon() should therefore make sure to either call daemon()
     before opening any files or sockets or, alternately, verifying that any file descriptors obtained have a value greater than 2.

BUGS

     daemon() uses fork() as part of its tty detachment mechanism.  Consequently the process id changes when daemon() is invoked.  Processes
     employing daemon() can not be reliably waited upon until daemon() has been invoked.

BSD
								 September 3, 1999							       BSD

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

redirect stderr to dev/null in bash env.

Discussion started by: Sniper Pixie

2. Solaris

URGENT - setup port and dump all output to /dev/null or a file

Discussion started by: frustrated1

3. UNIX for Dummies Questions & Answers

redirect stderr and/or stdout to /dev/null from command line

Discussion started by: knc9233

4. Shell Programming and Scripting

How to redirect the import log to /dev/null?

Discussion started by: vinoo128