fg is a job control command in Unix and Unix-like operating systems that resumes execution of a suspended process by bringing it to the foreground and thus redirecting its standard input and output streams to the user's terminal. fg is required to be included in an operating system in order for it to be POSIX compliant.
See also 
- The Single UNIX® Specification, Issue 7 from The Open Group : run jobs in the foreground – Commands & Utilities Reference,
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