To set the Hostname in SOLARIS x86

you should have all these files or else create it.
/etc/nodename
/etc/hostname.<interface>  e.g /etc/client.gani0  gani0 is the network interface
/etc/inet/hosts
/etc/inet/ipnodes

#vi /etc/nodename
client

#/etc/hostname.<interface>
client

bash-3.00# vi /etc/inet/hosts
"/etc/inet/hosts" [Read only] 6 lines, 111 characters
#
# Internet host table
#
127.0.0.1       localhost       loghost
::1     localhost       loghost
192.168.1.13    client# Added by DHCP   add "client" as host name


check in /etc/inet/ipnodes it will be changed and hostname will be client