| OS | Man Page | Section | Hits |
|---|---|---|---|
| freebsd | fd | 4 | 945 |
| bsd | fd | 4 | 838 |
| minix | fd | 4 | 828 |
| osx | fd | 4 | 655 |
| linux | fd | 4 | 641 |
| mojave | fd | 4 | 609 |
| netbsd | fd | 4 | 603 |
| centos | fd | 4 | 576 |
| redhat | fd | 4 | 560 |
| x11r4 | fd | 1 | 534 |
| suse | fd | 4 | 532 |
| posix | fd | 1 | 519 |
| opendarwin | fd | 4 | 509 |
| v7 | fd | 1 | 502 |
| debian | fd | 4 | 500 |
| hpux | fd | 1 | 496 |
| php | fd | 1 | 487 |
| debian | fd | 1 | 482 |
| osf1 | fd | 7 | 479 |
| plan9 | fd | 1 | 468 |
| xfree86 | fd | 1 | 461 |
| osf1 | fd | 4 | 457 |
| opensolaris | fd | 7d | 456 |
| sunos | fd | 7d | 444 |
| sunos | fd | 4 | 322 |
| opensolaris | fd | 4 | 286 |