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3 hostname: Show or set system host name.

hostname is a program to show or set the name of host system.

     hostname [option...] [name]
-a
--aliases
Get alias names.
-d
--domain
Get DNS domain name.
-f
--fqdn
--long
Get DNS host name or Fully Qualified Domain Name.
-F
--file
Set host name or NIS domain name from FILE.
-i
--ip-addresses
Get addresses for the host name.
-s
--short
Get short host name.
-y
--yp
--nis
Get NIS/YP domain name.