NOHUP(1)                   OpenBSD Reference Manual                   NOHUP(1)

NAME
     nohup - invoke a command immune to hangups

SYNOPSIS
     nohup utility [arg ...]

DESCRIPTION
     The nohup command allows the specified utility to be protected from ter-
     mination if the user should become logged out (for example, due to a mo-
     dem line or TCP/IP connection being dropped).  To do this, nohup sets the
     SIGHUP signal(3) (``terminal line hangup'') to be ignored, then executes
     utility along with any arguments.

     If the standard output is a terminal, the standard output is appended to
     the file nohup.out in the current directory.  If standard error is a ter-
     minal, it is directed to the same place as the standard output.

     If the output file nohup.out cannot be created in the current directory,
     nohup attempts to create the file in the user's home directory.  If the
     file nohup.out cannot be created, either in the current directory or the
     user's home directory, nohup will exit without invoking utility, with an
     exit value as described below.

     The nohup command shall exit with one of the following values:

           126     The utility was found but could not be invoked.
           127     The utility could not be found or an error occurred in
                   nohup.

     Otherwise, the exit status of nohup shall be that of utility.

ENVIRONMENT
     HOME    User's home directory.

SEE ALSO
     csh(1), signal(3)

STANDARDS
     The nohup utility is compliant with the IEEE Std 1003.1-2008 (``POSIX'')
     specification.

     nohup also exists as a built-in to csh(1), though with a different syn-
     tax.

OpenBSD 4.7                    February 8, 2009                              1
