The difference between nohup and &

In Unix/Linux systems, nohup and && are both methods used to run commands or programs in the background. nohup is more suitable for long-running tasks because it is not affected by terminal status, can continue to execute, and can manage output. And && is suitable for short-lived background tasks, used when the results need to be checked later.

nohup and & are both methods used in Unix/Linux systems to run commands or programs in the background, but there are some differences between them:

1. Usage scenarios:

   • &: Usually used with commands to put commands into the background for execution, but when you close the current terminal, the commands will of termination.
   • nohup: It can also be used to put the command into the background for execution, but it will not terminate when the current terminal is closed. Even if you log out or close the terminal, the command will still continue to execute.

2. Terminal dependency:

   • &: Depends on the state of the current terminal. When the terminal is closed, all processes related to the terminal will was terminated.
   • nohup: Not affected by the current terminal state, the process will continue to execute even if the terminal is closed.

3. Output processing:

   • &: Commands run in the background will redirect standard output and standard error to the current terminal.
   • nohup: By default, standard output and standard error are redirected to the file nohup.out, unless an output file is specified otherwise.

To sum up, nohup is more suitable for long-running tasks because it can continue to execute in the background without being affected by the terminal state, and can better manage the output . And & is suitable for short-lived background tasks when you need to check the results later.

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