08-08-2006
In unix 1 is defaut file descriptor for stdout and 2 is default file descriptor for stderr. So when you try redirecting on any of them you will redirect the stderr or stdout to a file or /dev/null.
regards
Apoorva Kumar
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
hi
im thinking of getting unix but i have no idea where to start I know that its an OS similar to linux but what hardware does in run on? i've heard of solaris but im not quit sure what it is
thankxs (3 Replies)
Discussion started by: ninja
3 Replies
2. UNIX for Dummies Questions & Answers
Hi,
I have a file, that is delimited by :: and the purpose of this file is none of your business. ;)
There are about 65000 lines in this file, and there are lines that I would like to remove. About 45000 of them.
Is there some sort of commands that I can run, to remove word(s) from this... (4 Replies)
Discussion started by: th3gh05t
4 Replies
3. Shell Programming and Scripting
Hello,
I have text file while looks this
test1
test2
test3
test4
test5
test6
and if I want to parse it and make new file which would like this
test1 test2
test3 test4
test5 test6
How can I do this in korn shell script
Thanks (9 Replies)
Discussion started by: peeyush_23
9 Replies
4. UNIX for Dummies Questions & Answers
sorry if im not asking inthe right spot but, how do you turn the beeping off every time you hit a key onthe keyboard. I tried the click -n but it told me it didnt recognize click
any help would be greatly appreciated ( the beeping is not going over well in the surrounding cubicles)
thank you... (4 Replies)
Discussion started by: Split100
4 Replies
5. UNIX for Dummies Questions & Answers
I am taking a db classes toward oracle 10g. I am taking unix as well . I need to know what is the best option for os . should I use linux fedora. or get a sun box and start learning from there. Thanks (6 Replies)
Discussion started by: xzyan
6 Replies
6. UNIX for Dummies Questions & Answers
What is the best way to learn UNIX on the web, with out buying books? any link would be much help.
Thank you in advance, L (1 Reply)
Discussion started by: lsoria1
1 Replies
7. Programming
Dear all,
I have a question related to parallel programing and if you can give me some hints on how to deal with it, it would be really great.
I would like to run a small application on a supercompter of 128 CPUs. Unfortunately, on this machine only jobs which require 32 CPUs are allowed to... (1 Reply)
Discussion started by: Eduard
1 Replies
8. UNIX for Dummies Questions & Answers
Hello everyone,
Just started UNIX today! In our school we use solaris. I just want to know how do I setup Solaris 10 not the GUI one, the one where you have to type the commands like ECHO, ls, pwd, etc... I have windows xp and I also have vmware.
I hope I am not missing anything! :p (4 Replies)
Discussion started by: Hanamachi
4 Replies
9. Shell Programming and Scripting
Hello everyone,
I am having to do a lot of perl scripting these days and I am learning a lot.
I have this problem
I want to move files from a folder and all its sub folders to one parent folder, they are all .gz files..
there is folder1\folder2\*.gz
and there are about 50 folders... (1 Reply)
Discussion started by: xytiz
1 Replies
10. UNIX for Dummies Questions & Answers
Hi all,
I am sure this is very simple but I cant quite get it.
I am trying to search textfile1.txt for a string then take the results of the search and append the result to textfile3.txt
So far I have used
$ find file1.txt -exec grep "string i am looking for" '{}' \; -print
this... (2 Replies)
Discussion started by: radgator
2 Replies
LEARN ABOUT NETBSD
mount_fdesc
MOUNT_FDESC(8) BSD System Manager's Manual MOUNT_FDESC(8)
NAME
mount_fdesc -- mount the file-descriptor file system
SYNOPSIS
mount_fdesc [-o options] fdesc mount_point
DESCRIPTION
The mount_fdesc command attaches an instance of the per-process file descriptor namespace to the global filesystem namespace. The conven-
tional mount point is /dev and the filesystem should be union mounted in order to augment, rather than replace, the existing entries in /dev.
The directory specified by mount_point is converted to an absolute path before use.
This command is normally executed by mount(8) at boot time.
The options are as follows:
-o Options are specified with a -o flag followed by a comma separated string of options. See the mount(8) man page for possible options
and their meanings.
The contents of the mount point are fd, stderr, stdin, stdout and tty.
fd is a directory whose contents appear as a list of numbered files which correspond to the open files of the process reading the directory.
The files /dev/fd/0 through /dev/fd/# refer to file descriptors which can be accessed through the file system. If the file descriptor is
open and the mode the file is being opened with is a subset of the mode of the existing descriptor, the call:
fd = open("/dev/fd/0", mode);
and the call:
fd = fcntl(0, F_DUPFD, 0);
are equivalent.
The files /dev/stdin, /dev/stdout and /dev/stderr appear as symlinks to the relevant entry in the /dev/fd sub-directory. Opening them is
equivalent to the following calls:
fd = fcntl(STDIN_FILENO, F_DUPFD, 0);
fd = fcntl(STDOUT_FILENO, F_DUPFD, 0);
fd = fcntl(STDERR_FILENO, F_DUPFD, 0);
Flags to the open(2) call other than O_RDONLY, O_WRONLY and O_RDWR are ignored.
The /dev/tty entry is an indirect reference to the current process's controlling terminal. It appears as a named pipe (FIFO) but behaves in
exactly the same way as the real controlling terminal device.
FILES
/dev/fd/#
/dev/stdin
/dev/stdout
/dev/stderr
/dev/tty
SEE ALSO
mount(2), unmount(2), tty(4), fstab(5), mount(8)
HISTORY
The mount_fdesc utility first appeared in 4.4BSD.
BUGS
This filesystem may not be NFS-exported.
BSD
March 27, 1994 BSD