[Linux] Bash nohup用法: Prevent command termination on logout

Overview

The nohup command in Bash is used to run another command immune to hangups, meaning it will continue to run even after you log out or close the terminal. This is particularly useful for long-running processes that you want to keep active without needing a terminal session.

Usage

The basic syntax of the nohup command is as follows:

nohup [options] [arguments]

Common Options

• &: Run the command in the background.
• -h: Display help information about the command.
• -v: Enable verbose mode, providing more detailed output.

Common Examples

1. Running a script in the background:

   nohup ./my_script.sh &
   

   This command runs my_script.sh in the background, allowing you to log out without stopping the script.

2. Redirecting output to a file:

   nohup python my_long_running_script.py > output.log &
   

   Here, the output of the Python script is redirected to output.log, making it easier to review later.

3. Running a command with no output:

   nohup sleep 300 &
   

   This command runs a sleep command for 300 seconds in the background without producing any output.

4. Using nohup with a command that requires input:

   nohup bash -c 'read -p "Press enter to continue..."' &
   

   This example runs a command that waits for user input but will not terminate if you log out.

Tips

• Always redirect output to a file when using nohup to avoid cluttering your terminal or losing important logs.
• Use the jobs command to check the status of background processes started with nohup.
• Combine nohup with disown to remove the job from the shell’s job table, allowing it to continue running independently.