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I would like to compare old.tex with new.tex file. I have find latexdiff is good for two latex comparison. But it's supporting only \documentclass{article}. But i have %&update-article.fmt format. Any ideas?

\title{Article Title Here}
 some text for compare two latex files;
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closed as unclear what you're asking by Joseph Wright Aug 10 '13 at 9:17

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question.If this question can be reworded to fit the rules in the help center, please edit the question.

i would assume that the "update-article" document is one to be used with a dumped version of some patching of latex. as such, you can't reasonably assume anything about how the update-article will compile. if you can if you can find how your update-article format was built, we can probably provide hints for making your documents commensurate with each other, enough that latexdiff can compare them. – wasteofspace Mar 12 '13 at 15:09
If you are on Unix, a regular diff -u should help getting an idea of where the files differ (LaTeX source is plain text, after all). I learned (for troff, but it is the same with LaTeX) to split at logical places in the text, i.e., after puctuation, a phrase always on the same line, and so on. Makes reorganizing easier (mostly shuffle lines around) and comparing versions via diff(1) simple. As an added bonus, placing a largeish document under version control gives understandable differences/merge suggestions. – vonbrand Mar 12 '13 at 17:45
We can't hope to tackle this, at least as it stands. – Joseph Wright Aug 10 '13 at 9:17