Sponsored Content
Full Discussion: Creating a file / /dev/null
Top Forums UNIX for Dummies Questions & Answers Creating a file / /dev/null Post 41804 by Perderabo on Wednesday 15th of October 2003 05:52:36 AM
Old 10-15-2003
1. Depends on your shell. Also a matter of opinion. People can reasonably disagree on "most elegant". With sh, ksh, or bash, my vote goes to:
> file


2. /dev/null is a data trashcan. Use it to discard stuff that you don't want. Suppose that you have a program that updates a data file. But it prints out messages like: "getting starting" "half way done" "all done" "closing file" "exiting". And also suppose that the program does not have an option to sut it up. Just use:
program > /dev/null

Also errors go to file descriptor 2. So you can use 2>/dev/null to discard error messages.
 

10 More Discussions You Might Find Interesting

1. 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? (1 Reply)
Discussion started by: frustrated1
1 Replies

2. Shell Programming and Scripting

> /dev/null

hello all, In many shell scripts i found '> /dev/null' , i am not able to get this, will any one please explain why we are using this. thanks sudha (2 Replies)
Discussion started by: rrs
2 Replies

3. UNIX for Advanced & Expert Users

/dev/NULL can't open this file ??

when i write the following two statements : cp /dev/NULL /clocal/mqbrkrs/user/mqsiadm/sanjay/dspmq_temp cat /dev/NULL > /clocal/mqbrkrs/user/mqsiadm/sanjay/dspmq_temp its gives me errors like : cp: /dev/NULL: A file or directory in the path name does not exist. cat : /dev/NULL can't open... (2 Replies)
Discussion started by: varungupta
2 Replies

4. Solaris

What is /dev/tty /dev/null and /dev/console

Hi, Anyone can help My solaris 8 system has the following /dev/null , /dev/tty and /dev/console All permission are lrwxrwxrwx Can this be change to a non-world write ?? any impact ?? (12 Replies)
Discussion started by: civic2005
12 Replies

5. Shell Programming and Scripting

/dev/null what is the use of it?

when do you use the path /dev/null (3 Replies)
Discussion started by: webmunkey23
3 Replies

6. 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 (3 Replies)
Discussion started by: glev2005
3 Replies

7. UNIX for Dummies Questions & Answers

/dev/null a file using xargs

Hi, I'm currently using the following command to wipe clean a log file which can't be straight out RM'd: cat /dev/null > server.log I'm building this into a script and I'm current working on a command to run on each machine to do this automatically however I have multiple files so I need... (11 Replies)
Discussion started by: Deehem
11 Replies

8. Shell Programming and Scripting

Redirecting standard out to /dev/null goes to file "/dev/null" instead

I apologize if this question has been answered else where or is too elementary. I ran across a KSH script (long unimportant story) that does this: if ; then CAS_SRC_LOG="/var/log/cas_src.log 2>&1" else CAS_SRC_LOG="/dev/null 2>&1" fithen does this: /usr/bin/echo "heartbeat:... (5 Replies)
Discussion started by: jbmorrisonjr
5 Replies

9. AIX

/dev/null file issue

Hi Experts, I Have a query. In one of my server I just came to know that there was /dev/null file which is a not a character file. Its just a normal file. I know the command to create the character file (/dev/null) but what is the procedure. Like should i delete /dev/null and create or... (7 Replies)
Discussion started by: jayadeava
7 Replies

10. AIX

Size of file /dev/./null 2>&1

Hello Can I just remove/delete flile ? rw-r--r-- 1 root system 2385088512 Jun 30 21:25 /dev/null 2>&1 size of this flile is 2274.75 m and fill up my filesystem: Filesystem MB blocks Used Free %Used Mounted on /dev/hd4 2560.00 2558.59 1.41 100% / (10 Replies)
Discussion started by: primo102
10 Replies
shell(1F)							   FMLI Commands							 shell(1F)

NAME
shell - run a command using shell SYNOPSIS
shell command [command] ... DESCRIPTION
The shell function concatenate its arguments, separating each by a space, and passes this string to the shell ($SHELL if set, otherwise /usr/bin/sh). EXAMPLES
Example 1: A sample output of shell command. Since the Form and Menu Language does not directly support background processing, the shell function can be used instead. `shell "build prog > /dev/null &"` If you want the user to continue to be able to interact with the application while the background job is running, the output of an exe- cutable run by shell in the background must be redirected: to a file if you want to save the output, or to /dev/null if you don't want to save it (or if there is no output), otherwise your application may appear to be hung until the background job finishes processing. shell can also be used to execute a command that has the same name as an FMLI built-in function. NOTES
The arguments to shell will be concatenate using spaces, which may or may not do what is expected. The variables set in local environments will not be expanded by the shell because "local" means "local to the current process." ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
sh(1), attributes(5) SunOS 5.10 5 Jul 1990 shell(1F)
All times are GMT -4. The time now is 08:19 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy