Is there a command to round decimal numbers in txt files?

Question

I saw this post, but I was wondering if there is a simpler command to round decimal numbers.

I have a file with milions of numbers:

0.1
1.2
3.8

I want to round them to integer

0
1
4

Is there a simple command to do that?

Answer 1

You can use the following perl oneliner:

perl -i -pe 's/(\d*\.\d*)/int($1+0.5)/ge' file

The -i option will automatically change your decimal numbers in-place.

The regex \d*\.\d* will ensure that only such numbers will be changed in your original file (i.e other strings will be left untouched)

Answer 2

With the awk commands in the link you post, you'd get something like this:

awk '{printf("%d\n",$0+0.5)}' file

Or simpler, use:

awk '{printf("%.f\n",$0)}' file

I can come up with nothing easier than that ;)