Bash - fg (foreground) - (Builtin command)
About
fg resume a job in the foreground, and make it the current job.
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Syntax
fg [jobspec]
If jobspec is not present, the shell’s notion of the current job is used.
Return value
The return value is that of;
the
command placed into the foreground,
-
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.