Ah. some times you want to go back to shell prompt when executing a command which is taking lengthy time. so to get ur shell back just give "&" at end of command to put ur job background.
example:
$ mozilla & # this command runs mozilla in background.
other alternative is bg command.
bg [jobspec]
Resume the 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.
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