Error output of cat to /dev/null Post: 302493932

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Hi, I have a script as follows: #!/bin/sh nohup ./my_program >& /dev/null & However, i get a "Generated or received a file descriptor number that is not valid" whenever I run it. running the command up in prompt is ok though. if i change the first line to #!/bin/csh i get a then:...

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cat /dev/null

Hi, Excuse my ignorance here - I'm a networks man and my knowledge of all things unix is somewhat limited. We have a very large file (/var/tmp/mond.log) that we need to zero - does the "cat /dev/null > /var/tmp/mond.log" command achieve this?

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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:...

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LEARN ABOUT MINIX

rename

RENAME(2)							System Calls Manual							 RENAME(2)

NAME

       rename - change the name of a file

SYNOPSIS

       #include <stdio.h>

       int rename(const char *from, const char *to)

DESCRIPTION

       Rename  causes the link named from to be renamed as to.	If to exists, then it is first removed.  Both from and to must be of the same type
       (that is, both directories or both non-directories), and must reside on the same file system.

       Rename guarantees that an instance of to will always exist, even if the system should crash in the middle of the operation.

       If the final component of from is a symbolic link, the symbolic link is renamed, not the file or directory to which it points.

RETURN VALUE

       A 0 value is returned if the operation succeeds, otherwise rename returns -1 and the global variable errno indicates  the  reason  for  the
       failure.

ERRORS

       Rename will fail and neither of the argument files will be affected if any of the following are true:

       [ENAMETOOLONG] A path name exceeds PATH_MAX characters.

       [ENOENT]       A component of the from path does not exist, or a path prefix of to does not exist.

       [EACCES]       A component of either path prefix denies search permission.

       [EACCES]       The requested link requires writing in a directory with a mode that denies write permission.

       [EPERM]	      The  directory  containing  from	is marked sticky, and neither the containing directory nor from are owned by the effective
		      user ID.

       [EPERM]	      The to file exists, the directory containing to is marked sticky, and neither the containing directory nor to are  owned	by
		      the effective user ID.

       [ELOOP]	      Too many symbolic links were encountered in translating either pathname.	(Minix-vmd)

       [ENOTDIR]      A component of either path prefix is not a directory.

       [ENOTDIR]      From is a directory, but to is not a directory.

       [EISDIR]       To is a directory, but from is not a directory.

       [EXDEV]	      The link named by to and the file named by from are on different logical devices (file systems).

       [ENOSPC]       The  directory  in which the entry for the new name is being placed cannot be extended because there is no space left on the
		      file system containing the directory.

       [EIO]	      An I/O error occurred while making or updating a directory entry.

       [EROFS]	      The requested link requires writing in a directory on a read-only file system.

       [EFAULT]       Path points outside the process's allocated address space.

       [EINVAL]       From is a parent directory of to, or an attempt is made to rename ``.'' or ``..''.

       [ENOTEMPTY]    To is a directory and is not empty.

SEE ALSO

       open(2)

4.2 Berkeley Distribution					   May 22, 1986 							 RENAME(2)

10 More Discussions You Might Find Interesting

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error piping nohup to /dev/null

Discussion started by: mochi

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

Discussion started by: frustrated1

3. Solaris

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

Discussion started by: civic2005

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cat /dev/null

Discussion started by: freakydancer