Package diction

Identifies diction and style errors

http://www.gnu.org/software/diction/diction.html

Diction and style are two old standard UNIX commands. Diction identifies wordy
and commonly misused phrases. Style analyses surface characteristics of a
document, including sentence length and other readability measures.

These programs cannot help you structure a document well, but they can help to
avoid poor wording and compare the readability (not the understandability!) of
your documents with others. Both commands support English and German documents.

General Commands (Section 1)
diction
Diction finds all sentences in a document that contain phrases from a database of frequently misused, bad or wordy diction. It further checks for double words...
style
Style analyses the surface characteristics of the writing style of a document. It prints various readability grades, length of words, sentences and paragraphs...