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
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