HP-UX Reference (11i v2 03/08) - 1 User Commands N-Z (vol 2)

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nohup(1) nohup(1)
NAME
nohup - run a command immune to hangups
SYNOPSIS
nohup command [ arguments ]
DESCRIPTION
nohup executes command with hangups and quits ignored. If output is not redirected by the user, both
standard output and standard error are sent to
nohup.out.Ifnohup.out is not writable in the
current directory, output is redirected to
$HOME/nohup.out
; otherwise, nohup fails. If a file is
created, the file’s permission bits will be set to
S_IRUSR | S_IWUSR.
If output from
nohup is redirected to a terminal, or is not redirected at all, the output is sent to
nohup.out.
EXTERNAL INFLUENCES
Environment Variables
LC_MESSAGES determines the language in which messages are displayed.
If
LC_MESSAGES is not specified in the environment or is set to the empty string, the value of
LANG is
used as a default for each unspecified or empty variable. If
LANG is not specified or is set to the empty
string, a default of "C" (see lang(5)) is used instead of
LANG.
If any internationalization variable contains an invalid setting,
nohup behaves as if all internationaliza-
tion variables are set to "C". See environ(5).
International Code Set Support
Single- and multi-byte character code sets are supported.
EXAMPLES
It is frequently desirable to apply
nohup to pipelines or lists of commands. This can be done only by
placing pipelines and command lists in a single file, called a shell script. To run the script using
nohup:
nohup sh file
nohup features apply to the entire contents of file. If the shell script file is to be executed often, the need
to type
sh can be eliminated by setting execute permission on file. The script can also be run in the
background with interrupts ignored (see sh(1)):
nohup file &
file typically contains normal keyboard command sequences that one would want to continue running in
case the terminal disconnects, such as:
tbl ofile | eqn | nroff > nfile
WARNINGS
Be careful to place punctuation properly. For example, in the command form:
nohup command1; command2
nohup applies only to command1. To correct the problem, use the command form:
nohup (command1; command2)
Be careful of where standard error is redirected. The following command may put error messages on
tape, making it unreadable:
nohup cpio -o <list >/dev/rmt/c0t0d0BEST&
whereas
nohup cpio -o <list >/dev/rmt/c0t0d0BEST 2>errors&
puts the error messages into file errors.
EXIT STATUS
The following exit values are returned:
126 The command specified by command was found but could not be invoked
Section 1−−636 Hewlett-Packard Company − 1 − HP-UX 11i Version 2: August 2003