| OS | Man Page | Section | Hits |
|---|---|---|---|
| redhat | pf | 4 | 3,326 |
| centos | pf | 4 | 3,083 |
| linux | pf | 4 | 1,077 |
| freebsd | pf | 4 | 812 |
| netbsd | pf | 4 | 776 |
| plan9 | pf | 4 | 561 |
| osx | pf | 4 | 545 |
| php | pf | 4 | 525 |
| debian | pf | 4 | 500 |
| mojave | pf | 4 | 459 |
| bsd | pf | 4 | 440 |
| suse | pf | 4 | 432 |
| v7 | pf | 4 | 430 |
| opensolaris | pf | 4 | 419 |
| osf1 | pf | 4 | 407 |
| minix | pf | 4 | 404 |
| xfree86 | pf | 4 | 401 |
| hpux | pf | 4 | 386 |
| x11r4 | pf | 4 | 348 |
| opendarwin | pf | 4 | 342 |