Regex(sed): How to form replace pattern according to a variable?

Question

I need to append a ".dev" or a ".prd" to a machine name depending on which domain they're in. The domain can be determined in the machine name, since they all follow the same pattern: hostd(..) for dev machines and hostp(..) for production machines.

Here's an example of what I want:

=============================
| input       | output      |
|=============|=============|
| hostd01     | hostd01.dev |
|-------------|-------------|
| hostp03     | hostp03.prd |
=============================

I'm new to sed, so I don't know how elegant is the solution I found (below). Isn't there a way to do it in one line?

sed -e 's/\([dp]\)\(..\)/\1\2.\1/' 
    -e 's/d$/dev/' 
    -e 's/p$/prd/'

No the actual input are the columns inside the table "hostd01" and "hostp03" — rahmu
– rahmu, Commented Sep 30, 2011 at 22:40

Fredrik Pihl · Accepted Answer · 2011-09-30 22:45:18Z

2

$ sed '/d/{s/$/\.dev/} ; /p/{s/$/\.prv/}' input 
hostd01.dev
hostp03.prv

answered Sep 30, 2011 at 22:45

Fredrik Pihl

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