| OS | Man Page | Section | Hits |
|---|---|---|---|
| freebsd | catopen | 3 | 896 |
| mojave | catopen | 3 | 668 |
| redhat | catopen | 3 | 660 |
| hpux | catopen | 3c | 633 |
| opendarwin | catopen | 3 | 607 |
| suse | catopen | 3 | 591 |
| opensolaris | catopen | 3c | 568 |
| linux | catopen | 3 | 566 |
| osx | catopen | 3 | 554 |
| centos | catopen | 3 | 553 |
| xfree86 | catopen | 3 | 530 |
| v7 | catopen | 3 | 513 |
| sunos | catopen | 3c | 504 |
| netbsd | catopen | 3 | 496 |
| debian | catopen | 3 | 491 |
| ultrix | catopen | 3int | 453 |
| posix | catopen | 3p | 409 |
| osf1 | catopen | 3 | 395 |
| suse | catopen | 3p | 326 |
| centos | catopen | 3p | 324 |