Detailed explanation of the meaning and usage of nohup

The nohup command is a very practical command in the Linux system. It can continue to run the specified command after the user logs out and redirect the output to the specified file, thereby avoiding program interruption caused by the terminal being closed or disconnected. stop. This article will introduce in detail the meaning, usage and practical application of the nohup command.

1. The meaning of nohup

nohup is the abbreviation of "no hang up", which means "not hanging up". It can continue to run a command in the background, even if the user exits the terminal or Even if the connection is disconnected, the command will not be affected and terminated. The nohup command is usually used in combination with &, which means that the command to be run will be executed in the background, and the output can be redirected to the specified file.

2. Usage of nohup

The basic syntax of the nohup command is as follows:

nohup command [arguments] &

Among them, command represents the command to be run, and arguments represents the parameters of the command. The & symbol means running the command in the background.

Using the nohup command can ensure that the command will continue to run in the background when the terminal is closed or the connection is disconnected. At the same time, nohup will redirect the output to the nohup.out file in the current directory by default. Users can also redirect the output to other files through the redirection operator.

Using the nohup command, a process running in the background will generate a nohup.out file, which contains the standard output and standard error of the process.

3. Practical application

1. Execute a long-term command after connecting to the server remotely

If you need to execute a command on the remote server For commands that run for a long time, you can use the nohup command to ensure that the command can still continue to execute after the user disconnects.

nohup ./my_long_running_command &

2. Running script in the background

If you need to run a script when the system starts and want the script to continue running in the background, you can use nohup Order.

nohup sh my_startup_script.sh &

3. Avoid disconnection causing the program to stop

When using the remote connection tool to connect to the server, if you want to run a program for a long time For programs that need to be run, you can use the nohup command.

nohup python my_long_running_script.py &

4. Record the output of the command

By redirecting the output of nohup to the specified file, you can easily record the output of the command for convenience Check later.

nohup ./my_command > my_command_output.log &

Conclusion

Through the explanation of this article, readers should have a certain understanding of the meaning, usage and practical application of the nohup command. The nohup command is very useful in Linux systems and can help users continue to run commands in the background to avoid unnecessary interruptions. Hope this article is helpful to readers.

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