Bash & (Ampersand)
The Bash & (ampersand) is a builtin control operator used to fork processes. From the Bash man page, "If a command is terminated by the control operator &, the shell executes the command in the background in a subshell".
If logged into an interactive shell, the process is assigned a job number and the child PID is displayed. The job number below is one.
bash$ sleep 30 &
[1] 3586
Note that when a process is forked, the child PID is stored in the special variable $!
bash$ echo $!
3586
You can terminate the job by its job number like so:
bash$ jobs
[1]+ Running sleep 30 &
bash$ kill %1
[1]+ Terminated sleep 30
bash$
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Is there a way of bringing
Is there a way of bringing it back again eg:
$ mv -v /large/directory /new/location &
$ echo "other work
$ echo insert magic hook command
"fg" brings it back to
"fg" brings it back to foreground.
And in the opposite way, a running process can be paused with CTRL+Z and then with "bg" pushed into background.
:(){ :|:& };: The 13
:(){ :|:& };:
The 13 character death in bash.
Run it at your own risk! It will fork bomb your machine.