Switch between processes

Suppose you use man to view a command mannual, meanwhile you want to practice some commands in the command line, you have to switch between the mannual and the command line, and after you switch back to mannual, you have to jump the location your have left, that is annoying. Actually, bash provided some tools to resolve this issue.

If you want to switch back to the command line, press ctrl+z, the process is suspend.

if you want run the process in backgroup, bg [number]

you can use command 'jobs' to see if there are backgroud processes.

command 'fg [number]' can switch a process to foreground, in our case, back to the user mannual.