nohup

• nohup is a command in Unix and Unix-like operating systems that allows a process to keep running after the terminal session has ended. It stands for “No Hangups”.
• The nohup command prevents the process from receiving the SIGHUP (Signal Hang UP) signal, which is sent when the terminal session ends. By default, this signal causes the process to terminate[^Source 1^][^Source 3^].

Here is an example of how to use nohup:

nohup command &

In this command, command is the process you want to run. The & at the end puts the command in the background, freeing up the terminal for other commands.

The output of the process is usually directed to a file named nohup.out. If you want to redirect the output to a different file, you can use the > operator:

nohup command > outputfile &

In this command, outputfile is the name of the file where you want to store the output[^Source 3^].

It’s important to note that nohup is different from a daemon. While both allow a process to run in the background, nohup is designed for processes that need to run to completion, whereas a daemon is designed for processes that run continuously in the background[^Source 0^].

Finally, remember that if a process started with nohup tries to interact with the terminal (for example, by asking for input), it will fail because the terminal is no longer available[^Source 4^].