#! /bin/sed

: x
s/\([0-9][0-9]*\)\([0-9][0-9][0-9]\)/\1,\2/
t x

### colorized by sedsed, a sed script debugger/indenter/tokenizer/HTMLizer
### original script: http://pcsiwa.rett.polimi.it/~paolob/seders/scripts/commify1.sed