> On Linux, you have multiple choices (wouldn’t you know?), but the easiest is to enter this in your terminal app:

> hostname -I

    $ hostname -I
    hostname: invalid option -- 'I'
    Usage: hostname [-v] {hostname|-F file}      set hostname (from file)
       domainname [-v] {nisdomain|-F file}   set NIS domainname (from file)
       hostname [-v] [-d|-f|-s|-a|-i|-y|-n]  display formatted name
       hostname [-v]                         display hostname