Linux nohup command principle and example analysis

nohup Command

When using Unix/Linux, we usually want a program to run in the background, so we often use & at the end of the program to make the program run automatically. For example, we want to run mysql in the background: /usr/local/mysql/bin/mysqld_safe –user=mysql &. But many programs are not like mysqld, so we need the nohup command

Process and job management

The nohup command can run the program in a way that ignores the hang-up signal, and the output information of the program being run will not be displayed to the terminal.

Regardless of whether you redirect the output of the nohup command to a terminal, the output is appended to the nohup.out file in the current directory. If the nohup.out file in the current directory is not writable, the output is redirected to the $HOME/nohup.out file. If no file can be created or opened for appending, the command specified by the command parameter cannot be invoked. If standard error is a terminal, then all output of the specified command written to standard error is redirected to the same file descriptor as standard output.

grammar

nohup(option)(parameter)

Options

--help: online help;

--version: Display version information.

parameter

Program and options: The program to run and the options.

Examples

one.

Run the spring boot jar package. When the current terminal is closed, the Spring Boot project still runs in the background.

nohup java -jar springboot.jar &

two.

Use the nohup command to submit a job. If you use the nohup command to submit a job, all output of the job is redirected to a file named nohup.out by default, unless an output file is specified otherwise:

nohup command > myout.file 2>&1 &

In the above example, the output is redirected to the file myout.file

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