s6-linux-utils
Software
skarnet.org
 The s6-hostname program 
s6-hostname gets or sets the machine hostname.
 Interface 
     s6-hostname [ name ]
 -  When called without an argument, s6-hostname prints the
machine hostname to stdout. 
-  When called with an argument, s6-hostname sets the machine
hostname to name. 
-  Then it exits 0.