Shutdown techniques after running the nohup command

The nohup command is a very practical Linux command that can ignore the SIGHUP signal when running a program on the command line, so that the program can continue to run after the user logs out. In actual use, we often encounter situations where we need to run a program in the background and keep it running continuously. This article will introduce the basic usage of the nohup command and share some shutdown techniques after running the nohup command.

1. Basic usage of nohup command

First, let us understand the basic usage of nohup command. The format of the nohup command is as follows:

nohup command [arg] &

Among them,commandis the command that needs to be run in the background, andargis the parameter of thecommandcommand. You can make a command run in the background by adding&at the end of the command. After executing this command, the terminal will output a prompt message informing the user that the log output by nohup will be recorded in thenohup.outfile in the current directory.

2. Shutdown techniques after running the nohup command

1. Check the process ID

After using the nohup command, sometimes We will need to manually close the programs running in the background. First, we need to see the process ID (PID) of the program. You can view the PID of the program running in the background through the following command:

ps -ef | grep command_name

wherecommand_nameis the name of the program running in the background.

2. Use the kill command to close the program

After obtaining the PID of the program, we can use thekillcommand to close the program . The format of the kill command is as follows:

kill -15 PID

Among them, the-15parameter represents the software stop signal. Send this signal to the program with the specified PID to close the program. If you want to forcefully close the program, you can use thekill -9 PIDcommand.

3. Use the pkill command to close the program

In addition to using PID to close the program, we can also use thepkillcommand to close the program according to the process name to close the program. The format of the pkill command is as follows:

pkill -f command_name

Among them, the-fparameter indicates the use of regular expressions to match process names, which can match multiple processes more flexibly.

4. View background tasks

If you want to view the tasks running in the background in the current system, you can use thejobscommand . Thejobscommand will list the tasks running in the background in the current terminal session, as well as the status of the tasks.

Through the above techniques, we can use the nohup command more flexibly and safely close programs running in the background to ensure safe and stable operation of the system.

Conclusion

This article introduces the basic usage of the nohup command and some shutdown techniques, hoping to help readers better understand and apply the nohup command. In actual use, you must operate with caution to avoid misoperation causing system instability or data loss. I hope this article is helpful to you, thank you for reading!

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