| OS | Man Page | Section | Hits |
|---|---|---|---|
| freebsd | catopen | 3 | 618 |
| hpux | catopen | 3c | 446 |
| mojave | catopen | 3 | 436 |
| redhat | catopen | 3 | 433 |
| opendarwin | catopen | 3 | 415 |
| osx | catopen | 3 | 378 |
| linux | catopen | 3 | 373 |
| opensolaris | catopen | 3c | 370 |
| suse | catopen | 3 | 370 |
| centos | catopen | 3 | 366 |
| v7 | catopen | 3 | 358 |
| sunos | catopen | 3c | 357 |
| debian | catopen | 3 | 351 |
| xfree86 | catopen | 3 | 347 |
| netbsd | catopen | 3 | 327 |
| ultrix | catopen | 3int | 313 |
| posix | catopen | 3p | 295 |
| osf1 | catopen | 3 | 272 |
| centos | catopen | 3p | 235 |
| suse | catopen | 3p | 218 |