find & incremental replace?

Shell Programming and Scripting
1

Looking for a way using sed/awk/perl to replace port numbers in a file with an incrementing number. The original file looks like...

Host cmg-iqdrw3p4
LocalForward *:9043 localhost:9043
Host cmg-iqdro3p3a
LocalForward *:10000 localhost:10000
Host cmg-iqdro3p3b
LocalForward *:10000 localhost:10000
......

And I want to convert it to:

Host cmg-iqdrw3p4
LocalForward *:9043 localhost:2062
Host cmg-iqdro3p3a
LocalForward *:10000 localhost:2063
Host cmg-iqdro3p3b
LocalForward *:10000 localhost:2064
.......

I used sed to convert 'localhost:xxxx' to 'localhost:'. In vi, I used the following to add back the incrementing port number.

:let i=2000 | g/localhost:/s//\="localhost:".i/ | let i=i+1

Is there a way to do it all in sed? Sed, awk, perl or shell script answers would all be welcome too. Thanks.

2

I'm assuming the counter starts from 2000 ...

awk -F: '/localhost/{ $NF=i++ }1' i=2000 OFS=: file
3

that works awesome!
Thanks Rubin.