Send job to foreground.
Syntax fg [job_id...]
Resume the specified job in the foreground, and make it the current job.
fg takes a “job ID” available from jobs, not a PID.
If jobspec is not present, the shell's notion of the current job is used.
The return value is that of the command placed into the foreground, or failure if run when job control is disabled or, when run with job control enabled, if jobspec does not specify a valid job or jobspec specifies a job that was started without job control.
Put the job with job id 0 in the foreground:
“A true friend stabs you in the front” ~ Oscar Wilde
Related bash commands:
bg - Send to background
jobs - List active jobs
suspend - Suspend execution of this shell