Unix/linux generally like to let a program inrunning in the background, many use & at the end of the program to let the program run in the background. For example we want to run MySQL in the background:/usr/local/mysql/bin/mysqld_safe--user=mysql &However, if many of our programs do not have the same daemon as mysqld, maybe our program is just a normal program, usually this kind of program uses & run in the background, but if the terminal is closed, then the program will be closed. But in order to be able to run in the background, we can use
NohupThis command.
It was a long time ago.
Test
workIn the use of nohup, this time a brief summary of it.
Nohup Command Reference
Nohup command
Purpose: To run the command without hanging off.
Syntax: Nohup Command [Arg ...] [&]
Description: The nohup command runs commands specified by the command parameter and any related ARG parameters, ignoring all hang-up (SIGHUP) signals. Use the Nohup command to run a program in the background after logging off. To run the Nohup command in the background, add & (the symbol representing "and") to the end of the command.
The output is appended to the Nohup.out file in the current directory, regardless of whether the output of the Nohup command is redirected to the terminal. If the nohup.out file for 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, then the command specified by the commands parameter is not callable. If the standard error is a terminal, then all output of the specified command to the standard error is redirected to the same file descriptor as the standard output.
Exit Status: The command returns the following exit values:
126 you can find but not invoke commands specified by the command parameter.
The 127 nohup command has an error or cannot find the command specified by the commands parameter.
Otherwise, the exit status of the Nohup command is the command parameter that specifies the exit state of the commands.
Nohup command and its output file
Nohup command: If you are running a process and you feel that the process will not end when you exit the account, you can use the Nohup command. This command can continue to run the process after you exit the account/close the terminal. Nohup is the meaning of not hanging (no hang up).
The general form of the command is: Nohup Command &
To submit a job using the Nohup command
If you submit a job using the Nohup command, all output from the job is redirected to a file named Nohup.out by default, unless the output file is specified separately:
Nohup command > Myout.file 2>&1 &
In the example above, the output is redirected to the Myout.file file.
Use jobs to view tasks.
Use FG%n to shut down (get backstage commands to the foreground foreground, of course nohup will not work)
Using Nohup under CentOS
