# GNU

| LOC  | File        |
| ---- | ----------- |
| 5629 | `ls.c`      |
| 2    | `ls-ls.c`   |
| 2    | `ls-dir.c`  |
| 2    | `ls-vdir.c` |
| 10   | `ls.h`      |
| 5645 | Total       |

## POSIX

Not mentioned in the man page

## Notes
* all the C files were in the same subdirectory; there was no organization by
binary
* `dir` and `vdir` were implemented as well

# FreeBSD

| LOC  | File       |
| ---- | ---------- |
| 1024 | `ls.c`     |
| 839  | `print.c`  |
| 236  | `util.c`   |
| 213  | `cmp.c`    |
| 89   | `ls.h`     |
| 80   | `extern.h` |
| 2481 | Total      |

## POSIX

From the man page:

> With the exception of options -g, -n and -o, the ls utility conforms to IEEE
> Std 1003.1-2001 (“POSIX.1”) and IEEE Std 1003.1-2008 (“POSIX.1”). The options
> -B, -D, -G, -I, -T, -U, -W, -Z, -b, -h, -w, -y and -, are non-standard
> extensions.

# OpenBSD

| LOC  | File       |
| ---- | ---------- |
| 13   | `main.c`   |
| 619  | `ls.c`     |
| 382  | `print.c`  |
| 70   | `util.c`   |
| 167  | `cmp.c`    |
| 57   | `utf8.c`   |
| 77   | `ls.h`     |
| 54   | `extern.h` |
| 1439 | Total      |

## POSIX

From the man page:

> The ls utility is compliant with the IEEE Std 1003.1-2008 (“POSIX.1”)
> specification, except behaviour for the -o flag differs.
>
> The flags [-hT], as well as the BLOCKSIZE environment variable, are extensions
> to that specification.
>
> The flags [-go] are marked by IEEE Std 1003.1-2008 (“POSIX.1”) as being an
> X/Open System Interfaces option.
>
> Historically, the -g flag was used to specify that the group field be included
> in long listings. The group field is now automatically included in the long
> listing for files and the meaning of the -g flag has been changed in order to
> be compatible with the IEEE Std 1003.1-2008 (“POSIX.1”) specification.

# NetBSD

| LOC  | File       |
| ---- | ---------- |
| 50   | `main.c`   |
| 717  | `ls.c`     |
| 579  | `print.c`  |
| 168  | `util.c`   |
| 199  | `cmp.c`    |
| 81   | `ls.h`     |
| 53   | `extern.h` |
| 1847 | Total      |

## POSIX

From the man page:

> The ls utility is expected to be a superset of the IEEE Std 1003.2 (“POSIX.2”)
> specification.