Bash Script Fg No Job Control
Returns the exit status of waited for command. You may use the wait command to prevent a script from exiting before a background job finishes executing this would create a dreaded orphan process.
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Advanced Bash Scripting Guide
The bash shell has a feature called job control that allows you to run and manage multiple processes from a single interactive prompt.
Bash script fg no job control. Job control refers to the ability to selectively stop suspend the execution of processes and continue resume their execution at a later point. At this point we have interactive control the script is running in the background and. The fg command moves a background job in the current shell environment into the foreground.
Attempting to use the job control features in the shell will then cause the message no job control in this shell to be printed. Any script or program that you run from a bash prompt is a job. If no job number is specified then the fg or bg command acts upon the currently running job.
How do i run jobs in the foreground on linuxunix bashksh or posix based shell. The shell may also lack job control because it has no controlling tty at all. If the script or program starts other processes for example a pipeline in a bash script those processes are part of the same job as the main script or program.
Stop script execution until all jobs running in background have terminated or until the job number or process id specified as an option terminates. Fg bg jobs and ctrl z. Suspend script execution until all jobs running in background have terminated or until the job number or process id specified as an option terminates.
Job control is what allows you to suspend jobs move jobs from the background to the foreground and vice versa from. In the age of serial connected dumb terminals this was a killer feature. Job control is nothing but the ability to stopsuspend the execution of processes command and continueresume their execution as per your requirements.
This means that it can no longer be managed using the job control mechanisms discussed in this guide like fg bg ctrl z ctrl c. The disown command in its default configuration removes a job from the jobs queue of a terminal. If no job number is specified then the fg or bg command acts upon the currently running job.
By default bash does not enable job control when you are running it non interactively as it is typically not useful in this case. Returns the exit status of waited for command. This chapter disusses what job control is how it works and how bash allows you to access its facilities.
The bash job control system provides other methods of achieving similar results with the disown built in command.
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