bg
NAME
bg - Resume each suspended job jobspec in the background, as if it had been started with &SYNOPSIS
bg [jobspec ...]
DESCRIPTION
Resume each 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. bg jobspec returns 0 unless run when job control is disabled or, when run with job control enabled, any specified jobspec was not found or was started without job control.
SEE ALSO
This is extracted from the main bash man page, see there for more details.