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docs: document fmt in GNU extensions #4748

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Apr 21, 2023
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docs: document fmt in GNU extensions #4748

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7 changes: 7 additions & 0 deletions docs/src/extensions.md
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Expand Up @@ -43,3 +43,10 @@ therefore welcomed.

`cut` can separate fields by whitespace (Space and Tab) with `-w` flag. This
feature is adopted from [FreeBSD](https://www.freebsd.org/cgi/man.cgi?cut).

## `fmt`

`fmt` has additional flags for prefixes: `-P/--skip-prefix`, `-x/--exact-prefix`, and
`-X/--exact-skip-prefix`. With `-m/--preserve-headers`, an attempt is made to detect and preserve
mail headers in the input. `-q/--quick` breaks lines more quickly. And `-T/--tab-width` defines the
number of spaces representing a tab when determining the line length.
Comment on lines +49 to +52
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Do we know whether these options were inspired by other implementations? It might be nice to mention those if there are any.

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I don't know where the inspiration for those flags came from. The coreutils implementations mentioned in https:/uutils/coreutils/blob/main/CONTRIBUTING.md don't have fmt implementations.

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Hmm indeed. It seems to be added here: #272 (comment), but the author seems to have invented them, which is alright.

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It's 9 years ago, but maybe they remember. @kwantam, do you remember whether these options exist elsewhere?