| OS | Man Page | Section | Hits |
|---|---|---|---|
| freebsd | catopen | 3 | 281 |
| opendarwin | catopen | 3 | 194 |
| mojave | catopen | 3 | 186 |
| redhat | catopen | 3 | 184 |
| linux | catopen | 3 | 178 |
| v7 | catopen | 3 | 171 |
| ultrix | catopen | 3int | 164 |
| centos | catopen | 3 | 160 |
| hpux | catopen | 3c | 159 |
| debian | catopen | 3 | 157 |
| opensolaris | catopen | 3c | 152 |
| sunos | catopen | 3c | 151 |
| suse | catopen | 3 | 151 |
| netbsd | catopen | 3 | 151 |
| xfree86 | catopen | 3 | 150 |
| osx | catopen | 3 | 147 |
| osf1 | catopen | 3 | 127 |
| posix | catopen | 3p | 119 |
| suse | catopen | 3p | 75 |
| centos | catopen | 3p | 68 |