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Killing a background process is fairly straightforward; use the command pkill and the process ID, or process name as: Using the pkill command will force terminate (-9) the processes with the process name of ping.
To bring a process running in the background to the foreground, use the fg command followed by the job id. To put in the background again, press CTRL + Z followed by the bg command.
In order to place a foreground proces into the background, we must first put the process to sleep, and then place it in the background. Execute the command to run your process. Press CTRL+Z to put the process into sleep. Run the bg command to wake the process and run it in the backround.
Suspend the process with CTRL+Z then use the command bg to resume it in background. For example:
sleep 60
^Z #Suspend character shown after hitting CTRL+Z
[1]+ Stopped sleep 60 #Message showing stopped process info
bg #Resume current job (last job stopped)
More about job control and bg usage in bash manual page:
JOB CONTROL
Typing the suspend character (typically ^Z, Control-Z) while a process is running causes that process to be stopped and returns control to bash. [...] The user may then manipulate the state of this job, using the bg command to continue it in the background, [...]. A ^Z takes effect immediately, and has the additional side effect of causing pending output and typeahead to be discarded.bg [jobspec ...]
Resume each suspended job jobspec in the background, as if it had been started with &. If jobspec is not present, the shell's notion of the current job is used.
EDIT
To start a process where you can even kill the terminal and it still carries on running
nohup [command] [-args] > [filename] 2>&1 &
e.g.
nohup /home/edheal/myprog -arg1 -arg2 > /home/edheal/output.txt 2>&1 &
To just ignore the output (not very wise) change the filename to /dev/null
To get the error message set to a different file change the &1 to a filename.
In addition: You can use the jobs command to see an indexed list of those backgrounded processes. And you can kill a backgrounded process by running kill %1 or kill %2 with the number being the index of the process.
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