| OS | Man Page | Section | Hits |
|---|---|---|---|
| redhat | pf | 4 | 2,720 |
| centos | pf | 4 | 2,422 |
| linux | pf | 4 | 854 |
| freebsd | pf | 4 | 653 |
| netbsd | pf | 4 | 592 |
| plan9 | pf | 4 | 481 |
| osx | pf | 4 | 427 |
| debian | pf | 4 | 418 |
| mojave | pf | 4 | 408 |
| php | pf | 4 | 393 |
| bsd | pf | 4 | 371 |
| v7 | pf | 4 | 360 |
| opensolaris | pf | 4 | 356 |
| minix | pf | 4 | 351 |
| suse | pf | 4 | 346 |
| xfree86 | pf | 4 | 343 |
| hpux | pf | 4 | 332 |
| osf1 | pf | 4 | 310 |
| x11r4 | pf | 4 | 305 |
| opendarwin | pf | 4 | 285 |