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What is PID process?
Process identifier, also known as process ID or PID, is a unique number to identify each process running in an operating system such as Linux, Windows, and Unix. PIDs are reused over time and can only identify a process during the lifetime of the process, so it does not identify processes that are no longer running.
What bash command helps to find PID of last background process?
One can easily find the PID of the last executed command in shell script or bash….The syntax is as follows:
- Open the terminal application.
- Run your command or app in the background.
- To get the PID of the last executed command type: echo “$!”
How to save the PID of the background process?
You need to save the PID of the background process at the time you start it: foo & FOO_PID=$! # do other stuff kill $FOO_PID You cannot use job control, since that is an interactive feature and tied to a controlling terminal.
How to get process ID of background process?
… which hoses you if foohappens to be multiple piped commands (eg. tail -f somefile.txt | grep sometext). In such cases, you will get the PID of the grep command from $!rather than the tail command if that’s what you were looking for. You will need to use jobsor psor the likes in this instance.
How to kill a process in the background?
You can kill a background process by entering: kill PID Replace PID with the process ID of the job. If that fails, enter the following: kill -KILL PID. To determine a job’s PID, enter: jobs -l. If you are using sh, ksh, bash, or zsh, you may prevent background processes from sending error messages to the terminal.
Is there a resume a process via a PID number?
P.S. David Purdue is correct that fg and bg only work with processes on the same process tree. His solution seems to be a better fit your needs. However because the title is “Resume a process via a PID number” I figured that others who do need this might want to find it.