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Full Discussion: When we need nohup
Top Forums UNIX for Dummies Questions & Answers When we need nohup Post 302359752 by radoulov on Wednesday 7th of October 2009 10:09:00 AM
Old 10-07-2009
When the parent shell exits your background jobs (started without nohup) will exit too.

Quote:
DESCRIPTION
The nohup utility invokes the named command with the argu-
ments supplied. When the command is invoked, nohup arranges
for the SIGHUP signal to be ignored by the process.

The nohup utility can be used when it is known that command
will take a long time to run and the user wants to logout of
the terminal; when a shell exits, the system sends its chil-
dren SIGHUP signals, which by default cause them to be
killed. All stopped, running, and background jobs will
ignore SIGHUP and continue running, if their invocation is
preceded by the nohup command or if the process programmati-
cally has chosen to ignore SIGHUP.
 

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NOHUP(1)						    BSD General Commands Manual 						  NOHUP(1)

NAME
nohup -- invoke a utility immune to hangups SYNOPSIS
nohup [--] utility [arguments] DESCRIPTION
The nohup utility invokes utility with its arguments and at this time sets the signal SIGHUP to be ignored. If the standard output is a ter- minal, the standard output is appended to the file nohup.out in the current directory. If standard error is a terminal, it is directed to the same place as the standard output. Some shells may provide a builtin nohup command which is similar or identical to this utility. Consult the builtin(1) manual page. ENVIRONMENT
The following variables are utilized by nohup: HOME If the output file nohup.out cannot be created in the current directory, the nohup utility uses the directory named by HOME to create the file. PATH Used to locate the requested utility if the name contains no '/' characters. EXIT STATUS
The nohup utility exits 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 will be that of utility. SEE ALSO
builtin(1), csh(1), signal(3) STANDARDS
The nohup utility is expected to be IEEE Std 1003.2 (``POSIX.2'') compatible. BUGS
Two or more instances of nohup can append to the same file, which makes for a confusing output. BSD
July 19, 2001 BSD
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