UNIX for Dummies Questions & Answers

I have a file like this

1 chr1 3661579 3662579
2 chr1 4350395 4351395
3 chr1 4399322 4400322
4 chr1 4486494 4487494
5 chr1 4775807 4776807
6 chr1 4775807 4776807
7 chr1 4775807 4776807
8 chr1 4796973 4797973
9 chr1 4846774 4847774
10 chr1 4846774 4847774
11 chr1 4847408 4848408
12 chr1 5009507 5010507
13 chr1 5060366 5061366
14 chr1 5072253 5073253
15 chr1 5577573 5578573
16 chr1 5907479 5908479

for the forth column , I d like to add 1000 to each value, does anyone know the linux command for that. Thank you so much, I really appreciate.

Code:

#!/bin/bash
while read A B C D
do
        echo $A $B $C $((D+1000))
done < inputfile > outputfile

Another one:

Code:

awk '{$4+=1000}1' file > newfile

Or even

Code:

awk '$4+=1000' file