 Most of the Unix and Unix-like operating systems (e.g.Linux since 2.5.46 or November 2002, BSD, or Solaris) support POSIX.1e ACLs (not necessarily draft 17).Many of them, for example AIX, FreeBSD, Mac OS X beginning with version 10.4 ("Tiger"), or Solaris with ZFS filesystem, support NFSv4 ACLs, which are part of the NFSv4 standard.