Bash.Builtin.Fg (Bash v0.6.0)

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fg [job_spec]

Place JOB_SPEC in the foreground, and make it the current job. If JOB_SPEC is not present, the shell's notion of the current job is used.

Reference: https://cgit.git.savannah.gnu.org/cgit/bash.git/plain/builtins/fg_bg.def?h=bash-5.3