To run a process in the background as a job and carry on working add an & (ampersand) at the end of the command line. For example:
$find /usr/man -name *.1 -print > sect1 & [1] 2548 $
The shell forks a child process to run the command and displays the job number ([n]) and the PID (Process IDentifier) number. The shell prompt returns and you can enter further commands.