The '&' control operator might be what you are looking for.
Excerpt from `man 1 bash`:
SHELL GRAMMAR
Lists
If a command is terminated by the control operator &, the shell exe‐
cutes the command in the background in a subshell. The shell does not
wait for the command to finish ...
try:
(<command> | parallel <command> | parallel <command> >> file) &
If you work on a remote machine execute in a `screen` session.
`nohup <script> &` is another solution to disconnects.
