Master the techniques of nohup and & to avoid unexpected process termination

In Unix/Linux systems, users often need to run some time-consuming tasks, such as data processing, model training, etc. However, due to the limitations of terminal sessions, once the user exits the terminal, the background task will also terminate. To solve this problem, you can usually use the nohup and & techniques to enable the process to run in the background to avoid unexpected termination.

1. nohupCommand

nohup is a very useful command that allows the command to run in the background without being disconnected by the terminal. Impact. The usage of nohup is as follows:

nohup command &

where command is the command to be executed. For example, if you want a script file script.sh to run in the background, you can use the following command:

nohup ./script.sh &

In this way, even if the user closes the terminal, script.sh This task will also run in the background until the task is completed.

2. &symbol

In addition to the nohup command, we can also use the &symbol to place tasks Runs in the background. This allows the command to run in the background, but once the terminal is disconnected, the background task may still terminate. The usage method of & is as follows:

command &

Taking the script file script.sh as an example, you can use the following command to run it in the background:

./script.sh &

It should be noted that using the & symbol will put the task in the background, but the output of the task will be printed directly to the terminal. If you need to redirect the output to a file, you can use the following Command:

./script.sh > output.log 2>&1 &

In this way, the output of script.sh will be saved to the output.log file for easy viewing and analysis.

By mastering the skills of nohup and &, we can avoid the problem of unexpected process termination due to terminal disconnection, ensure that background tasks can continue to run, and improve Work efficiency. I hope the above content is helpful to everyone.

The above is the detailed content of Master the techniques of nohup and & to avoid unexpected process termination. For more information, please follow other related articles on the PHP Chinese website!