fg - resume jobs in the foreground.
fg [job_id]
fg is a POSIX regular builtin provided by Rush. Resume jobs in the foreground.
This page summarizes the builtin in Rush documentation. POSIX is the normative reference for detailed portable behavior.
See the POSIX definition for command-specific status rules. Usage errors generally return a non-zero status.
rush-builtins(7), POSIX Shell Command Language.