Nohup Command – UNIX

Nohup Command UNIX


nohup command execute any shell commands or script without any hung-ups i.e. script will not terminate even after terminal session is closed.

Output of nohup command is to a non-tty.

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’.


Following options can be used with the nohup command:

–help display this help and exit
–version output version information and exit


Example 1:

Suppose we want to run the ‘’ script at the backend, we will use nohup as shown below:

$ nohup ./ > log.txt &

Example 2:

If someone wants to check the version of nohup installed on the system:

$ nohup –version

nohup (GNU coreutils) 8.22
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.