Personalize Diff Command in Ubuntu

Posted by acidboy on Stack Overflow See other posts from Stack Overflow or by acidboy
Published on 2013-10-31T15:20:43Z Indexed on 2013/10/31 21:55 UTC
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linux

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console

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diff

I have two files, both with a lot of data, what I need is compare the first word of each file (each file always starts with a number, and each number could have many digits).

The files are identical when these numbers are the same.

Example: I have 3 files: a.txt, b.txt and c.txt

 a.txt content is "1 a b c 3 5 6 hjkj"
 b.txt content is "1 c f a 1234 h"
 c.txt content is "2 a b c 3 5 6 hjkj"

 diff a.txt b.txt should return "files are identical"
 diff a.txt c.txt should return "files are different"

How can I compare them using the diff command?

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