remove space characters

Shell Programming and Scripting
1

hello

I have this output
ifspeed 100000000
ifspeed 100000000
collisions 413
collisions 10
duplex full
duplex full

from
kstat bnx | grep ifspeed
kstat bnx | grep collisions
kstat bnx | grep duplex

I want to get

ifspeed: 100000000
ifspeed:100000000
collisions: 413
collisions: 10
duplex: full
duplex: full

So remove the white charcters and add : between both fields.

Any idea?
thanks

2

solved.

kstat bnx | grep ifspeed | awk '{print $1":"$2}'