比较两个包含双打的文件

Question

I want to check equality of two files containing double numbers.

I should consider near numbers equal eg differences of at most 0.0001 .

It's easy to write a tester for that with C but is there an easier way? eg bash commands?

Answer 1

Here is one way you can do it:

paste file1 file2  | awk '{d=$1-$2;if((d<0?-1*d:d)>0.0001) print $0 " " d }'

First use paste to print out corresponding lines. Then pass them to awk to subtract. Calculate the absolute difference and check if it is more than your tolerance of 0.00001. If so, print out both values and the difference.

Answer 2

Bash does not provide operators for floating point manipulations. You can look up bc and it should be fairly easy to integrate it in a bash script.

See this article on Linux Journal. That should provide you with a starting point. It is upto you to work through the file structure.