| OS | Man Page | Section | Hits |
|---|---|---|---|
| freebsd | catopen | 3 | 748 |
| mojave | catopen | 3 | 542 |
| redhat | catopen | 3 | 535 |
| hpux | catopen | 3c | 530 |
| opendarwin | catopen | 3 | 502 |
| suse | catopen | 3 | 485 |
| linux | catopen | 3 | 462 |
| opensolaris | catopen | 3c | 460 |
| osx | catopen | 3 | 459 |
| xfree86 | catopen | 3 | 439 |
| centos | catopen | 3 | 439 |
| sunos | catopen | 3c | 426 |
| v7 | catopen | 3 | 424 |
| debian | catopen | 3 | 410 |
| netbsd | catopen | 3 | 394 |
| ultrix | catopen | 3int | 379 |
| posix | catopen | 3p | 342 |
| osf1 | catopen | 3 | 325 |
| centos | catopen | 3p | 274 |
| suse | catopen | 3p | 269 |