Program job management-background operation management

Program job management-background operation management 1. concept prospects: the environment in which you can control and issue commands is called foreground. Background: jobs that can operate on your own, you cannot use [ctrl] + c to terminate the job. you can use bg/fg to call the job. www. 2CT... program job management-background operation management 1. concept prospects: the environment in which you can control and issue commands is called foreground. Background: jobs that can operate on your own, you cannot use [ctrl] + c to terminate the job. you can use bg/fg to call the job. programs in the www.2cto.com background can be paused or running. System Background: if it is a background, it will be interrupted when you exit. if it is a background of the system, it can also run when you exit the terminal. 2. directly drop the command into the background and 'execute '. Simply Add & at the end of the command, as shown in [root @ www ~]. # Tar-zpcvf/tmp/etc.tar.gz/etc>/tmp/log.txt 2> & 1 & 3. throw the 'current 'job to the background and 'pause ': [ctrl]-z4. observe the current background working status: jobs [root @ www ~] # Jobs [-lrs] option and parameter: www.2cto.com-l: in addition to listing the job number and command string, the PID number is also listed;-r: Only list jobs in the background run; -s: Only list jobs that are being paused in the background. 5. get the background work to the foreground: fg [root @ www ~] # Fg % jobnumber option and parameter: % jobnumber: jobnumber is a work number (number ). Note that % is dispensable! [1] + Stopped + indicates that if fg is input directly, this 6 is used to make the work in the background state operational: bg % work number 7. management background: kill [root @ www ~] # Kill-signal % jobnumber [root @ www ~] # Kill-l option and parameter:-l: the lower case of L. Which of the following signals can be used by kill? Signal: what kind of instruction does it mean to give the subsequent job ?? # Man 7 signal:-1: re-read the parameter configuration file (similar to reload);-2: represents the same action as entering [ctrl]-c on the keyboard; -9: force delete a job immediately.-15: terminate a job as a normal program. It is different from-9. The default number next to kill will be PID. if you want to manage bash's work control, you have to add % number, so pay special attention to this! 8. run it offline, that is, put it in the system background [root @ www ~] # Nohup [commands and parameters] <= working in the foreground of the terminal [root @ www ~] # Nohup [commands and parameters] & <== directly enter nohup in the background of the terminal to query the currently executed