Nohup

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Overview

nohup is a POSIX command to ignore the HUP (hangup) signal. The HUP signal is, by convention, the way a terminal warns dependent processes of logout.

nohup command &

Output that would normally go to the terminal goes to a file called ./nohup.out if it has not already been redirected.

Note that nohupping backgrounded jobs is typically used to avoid terminating them when logging off from a remote SSH session.

A different issue that often arises in this situation is that ssh is refusing to log off ("hangs"), since it refuses to lose any data from/to the background job(s).

This problem can be overcome by redirecting all three I/O streams:

{{{ $ nohup ./myprogram > foo.out 2> foo.err < /dev/null & }}}


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