Insert text at beginning of line 1

[screwloose]

host=saturn


lo0: flags=1000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv4> mtu 8232 index 1
inet 127.0.0.1 netmask ff000000
host=neptune


lo0: flags=1000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv4> mtu 8232 index 1
inet 127.0.0.1 netmask ff000000


Given the above, how do I insert "host=X" in front of lo0:
so it reads:
host=neptune lo0:

Thanks!

 

[PHV]

Something like this ?
awk '/host=/{h=$0;next}/$1~/:$/{print h,$1}'

Hope This Helps, PH.
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