Shell Programming and Scripting

Dear ALL,

I have sample file :

host.txt

Code:

fullname: FreeBSD
Host: server1
ip: 1.1.1.1
mask: 255.255.255.0

fullname: CentOS
Host: server2
mask: 255.255.255.0

fullname: Fedora
Host: server3
ip: 1.3.1.2
mask: 255.255.255.0

fullname: Asterisk
Host: VoIP1
ip: 1.1.2.4
mask: 255.255.255.0

required output:

Code:

fullname: FreeBSD
Host: server1
ip: 1.1.1.1
mask: 255.255.255.0

fullname: CentOS
Host: server2
ip: no-ip
mask: 255.255.255.0

fullname: Fedora
Host: server3
ip: 1.3.1.2
mask: 255.255.255.0

fullname: Asterisk
Host: VoIP1
ip: 1.1.2.4
mask: 255.255.255.0

Can you help me pls..

Thanks

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