| OS | Man Page | Section | Hits |
|---|---|---|---|
| freebsd | catopen | 3 | 315 |
| opendarwin | catopen | 3 | 221 |
| redhat | catopen | 3 | 219 |
| mojave | catopen | 3 | 218 |
| v7 | catopen | 3 | 198 |
| linux | catopen | 3 | 194 |
| ultrix | catopen | 3int | 190 |
| hpux | catopen | 3c | 189 |
| debian | catopen | 3 | 188 |
| centos | catopen | 3 | 186 |
| netbsd | catopen | 3 | 181 |
| suse | catopen | 3 | 179 |
| sunos | catopen | 3c | 177 |
| opensolaris | catopen | 3c | 176 |
| xfree86 | catopen | 3 | 176 |
| osx | catopen | 3 | 173 |
| osf1 | catopen | 3 | 145 |
| posix | catopen | 3p | 141 |
| suse | catopen | 3p | 97 |
| centos | catopen | 3p | 88 |