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Full Discussion: nohup process hangs
Top Forums Shell Programming and Scripting nohup process hangs Post 88272 by Perderabo on Wednesday 2nd of November 2005 02:05:39 PM
Old 11-02-2005
"hang" is not a very technical term. If a program is taking a very long time it may be doing everything right. Or it may have a bug and be in an infinite loop. nohup will certainly not help you here. No reasonable person would think that it should. But if you type a command like:
/usr/bin/cat
the program will wait for input from the tty. If you don't know that, you may be staring at a screen wait for the cat command to end. This is a special type of "hang"...waiting for tty input. Should nohup protect you from this? Maybe it should, but it is surprisingly hard to do this safely. For better or worse, nohup does not protect you from this either. You can use "at now" to run stuff completely disconnected from a tty. And you're on your own if you have infinite loops.
 

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NOHUP(1)							   User Commands							  NOHUP(1)

NAME
nohup - run a command immune to hangups, with output to a non-tty SYNOPSIS
nohup COMMAND [ARG]... nohup OPTION DESCRIPTION
Run COMMAND, ignoring hangup signals. --help display this help and exit --version output version information and exit If standard input is a terminal, redirect it from /dev/null. If standard output is a terminal, append output to 'nohup.out' if possible, '$HOME/nohup.out' otherwise. If standard error is a terminal, redirect it to standard output. To save output to FILE, use 'nohup COMMAND > FILE'. NOTE: your shell may have its own version of nohup, which usually supersedes the version described here. Please refer to your shell's doc- umentation for details about the options it supports. GNU coreutils online help: <http://www.gnu.org/software/coreutils/> Report nohup translation bugs to <http://translationproject.org/team/> AUTHOR
Written by Jim Meyering. COPYRIGHT
Copyright (C) 2013 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. SEE ALSO
The full documentation for nohup is maintained as a Texinfo manual. If the info and nohup programs are properly installed at your site, the command info coreutils 'nohup invocation' should give you access to the complete manual. GNU coreutils 8.22 June 2014 NOHUP(1)
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