bg(1)                                fish                                bg(1)

       bg - send jobs to background

       bg [PID...]

       bg sends jobs to the background, resuming them if they are stopped.

       A background job is executed simultaneously with fish, and does not
       have access to the keyboard. If no job is specified, the last job to be
       used is put in the background. If PID is specified, the jobs with the
       specified process group IDs are put in the background.

       When at least one of the arguments isn't a valid job specifier (i.e.
       PID), bg will print an error without backgrounding anything.

       When all arguments are valid job specifiers, bg will background all
       matching jobs that exist.

       bg 123 456 789 will background 123, 456 and 789.

       If only 123 and 789 exist, it will still background them and print an
       error about 456.

       bg 123 banana or bg banana 123 will complain that 'banana' is not a
       valid job specifier.

Version 3.0.2                   Tue Mar 26 2019                          bg(1)