On Sat May 10, 2025 at 9:37 AM CEST, Aditya Garg wrote:
> `hostname` is a popular command available on both Linux and macOS. As
> per the man-page[1], `hostname --fqdn` command returns the fully
> qualified domain name (FQDN) of the system.
There are multiple implementations of the hostname command, and they
don't all support `--fqdn`. For example this will not work on Alpine
Linux as well as macOS.
macOS:
$ hostname --fqdn
hostname: illegal option -- -
usage: hostname [-f] [-s | -d] [name-of-host]
Alpine:
$ hostname --fqdn
hostname: unrecognized option: fqdn
BusyBox v1.37.0 (2025-01-17 18:12:01 UTC) multi-call binary.
Usage: hostname [-sidf] [HOSTNAME | -F FILE]
Show or set hostname or DNS domain name
-s Short
-i Addresses for the hostname
-d DNS domain name
-f Fully qualified domain name
-F FILE Use FILE's content as hostname
All seem to support `-f` though, maybe that would be the better option.
Regards Julian
