| OS | Man Page | Section | Hits |
|---|---|---|---|
| freebsd | catopen | 3 | 456 |
| mojave | catopen | 3 | 329 |
| hpux | catopen | 3c | 317 |
| opendarwin | catopen | 3 | 314 |
| redhat | catopen | 3 | 312 |
| centos | catopen | 3 | 277 |
| v7 | catopen | 3 | 275 |
| osx | catopen | 3 | 274 |
| suse | catopen | 3 | 269 |
| linux | catopen | 3 | 268 |
| debian | catopen | 3 | 267 |
| sunos | catopen | 3c | 264 |
| xfree86 | catopen | 3 | 264 |
| opensolaris | catopen | 3c | 260 |
| netbsd | catopen | 3 | 254 |
| ultrix | catopen | 3int | 248 |
| posix | catopen | 3p | 215 |
| osf1 | catopen | 3 | 211 |
| suse | catopen | 3p | 151 |
| centos | catopen | 3p | 144 |