The fmt command takes some text (say an article that you have written in a text editor) and does some sensible reformatting to it. Provided that you have separated paragraphs by empty lines, fmt will combine broken lines and make all lines a sensible length. It can also ensure that words are separated by one space and sentences by two. In the example that follows, the -u option forces uniform spacing — in other words, one space between words and two spaces between sentences.
This is a file with some extra space and its line endings in a mess. We need to reformat it somehow.
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