UNIX for Advanced & Expert Users

I/p

10000.0000
20000.00

Expecting o/p

10001.000
200002.00

> cat infile
10000.0000
20000.00

> awk '{printf("%f\n",$1+NR)}' infile
10001.000000
20002.000000

or

> awk '{printf("%.3f\n",$1+NR)}' infile
10001.000
20002.000

#!/bin/bash

LC=1
while read DV
do
  LV=$( echo $DV | cut -d '.' -f 1 )
  RV=$( echo $DV | cut -d '.' -f 2 )
  LV=$(( $LV + $LC ))
  OV=${LV}.${RV}
  echo "$OV" >> out.file
  LC=$(( $LC + 1 ))
done < in.file
cat out.file

exit 0
# finis

[house@leonov] cat in.file
10000.0000
20000.00
[house@leonov] bash test.bash
10001.0000
20002.00