Differences between 'hostname -i' and 'hostname -I' Commands

julianvb · 06-23-2017, 05:36 PM

2017-06-23

When I enter 'hostname -i', Linux Mint returns '127.0.1.1' whereas it returns '192.168.1.241' when I enter 'hostname -I'. The manual does not clearly define the difference between the two commands. How do I differentiate one from the other?

Thanks.

Julianvb

pan64 · 06-24-2017, 08:39 AM

the manual:

Code:

-i, --ip-address
    Display the IP address(es) of the host. Note that this works only if the host name can be resolved. Avoid using this option; use hostname --all-ip-addresses instead. 
-I, --all-ip-addresses
    Display all network addresses of the host. This option enumerates all configured addresses on all network interfaces. The loopback interface and IPv6 link-local addresses are omitted. Contrary to option -i, this option does not depend on name resolution. Do not make any assumptions about the order of the output.

with -i it does not find 192.168.1.241
with -I '192.168.1.241' was detected and local addresses like 127.0.x.y were omitted.