Continues a stopped job by running it in the foreground, some shells are not able to run this command.
syntax: fg [%job]

%job Specifies the job that you want to run in the foreground.

Example:
fg - Typing fg alone will resume the first job were it was left off. fg 1 - specifying the job (in this case 1) will resume that particular job. The job id can be determined by running bg.