Size  int64  // Logical file size in bytes
	Mode  int64  // Permission and mode bits
	Uid   int    // User ID of owner
	Gid   int    // Group ID of owner
	Uname string // User name of owner
	Gname string // Group name of owner

	// If the Format is unspecified, then Writer.WriteHeader rounds ModTime
	// to the nearest second and ignores the AccessTime and ChangeTime fields.
	//

<pre class="grammar">
Production  = production_name "=" [ Expression ] "." .
Expression  = Alternative { "|" Alternative } .
Alternative = Term { Term } .
Term        = production_name | token [ "…" token ] | Group | Option | Repetition .
Group       = "(" Expression ")" .
Option      = "[" Expression "]" .
Repetition  = "{" Expression "}" .
</pre>

<p>
Productions are expressions constructed from terms and the following

pkg os/user, func LookupGroup(string) (*Group, error)
pkg os/user, func LookupGroupId(string) (*Group, error)
pkg os/user, method (*User) GroupIds() ([]string, error)
pkg os/user, method (UnknownGroupError) Error() string
pkg os/user, method (UnknownGroupIdError) Error() string
pkg os/user, type Group struct
pkg os/user, type Group struct, Gid string
pkg os/user, type Group struct, Name string

pkg syscall (netbsd-arm64-cgo), const IPV6_IPSEC_POLICY = 28
pkg syscall (netbsd-arm64-cgo), const IPV6_IPSEC_POLICY ideal-int
pkg syscall (netbsd-arm64-cgo), const IPV6_JOIN_GROUP = 12
pkg syscall (netbsd-arm64-cgo), const IPV6_LEAVE_GROUP = 13
pkg syscall (netbsd-arm64-cgo), const IPV6_MAXHLIM = 255
pkg syscall (netbsd-arm64-cgo), const IPV6_MAXHLIM ideal-int
pkg syscall (netbsd-arm64-cgo), const IPV6_MAXPACKET = 65535

	for i := 1; i <= len(exitStr); i++ {
		fmt.Fprintf(&exitReStr, "%s$|", exitStr[:i])
	}
	// Finally, match the exit string along with an exit code.
	// This is the only case we use a group, and we'll use this
	// group to extract the numeric code.
	fmt.Fprintf(&exitReStr, "%s([0-9]+)$", exitStr)
	exitRe := regexp.MustCompile(exitReStr.String())

	return &exitCodeFilter{w: w, exitRe: exitRe}, exitStr
}

pkg syscall (darwin-arm64), const IPV6_IPSEC_POLICY = 28
pkg syscall (darwin-arm64), const IPV6_IPSEC_POLICY ideal-int
pkg syscall (darwin-arm64), const IPV6_JOIN_GROUP = 12
pkg syscall (darwin-arm64), const IPV6_LEAVE_GROUP = 13
pkg syscall (darwin-arm64), const IPV6_MAXHLIM = 255
pkg syscall (darwin-arm64), const IPV6_MAXHLIM ideal-int
pkg syscall (darwin-arm64), const IPV6_MAXOPTHDR = 2048

pkg debug/elf, const DF_1_GLOBAL DynFlag1 #56887
pkg debug/elf, const DF_1_GLOBAUDIT = 16777216 #56887
pkg debug/elf, const DF_1_GLOBAUDIT DynFlag1 #56887
pkg debug/elf, const DF_1_GROUP = 4 #56887
pkg debug/elf, const DF_1_GROUP DynFlag1 #56887
pkg debug/elf, const DF_1_IGNMULDEF = 262144 #56887
pkg debug/elf, const DF_1_IGNMULDEF DynFlag1 #56887
pkg debug/elf, const DF_1_INITFIRST = 32 #56887

pkg syscall (freebsd-arm64), const IPV6_IPSEC_POLICY ideal-int
pkg syscall (freebsd-arm64), const IPV6_JOIN_GROUP = 12
pkg syscall (freebsd-arm64), const IPV6_LEAVE_GROUP = 13
pkg syscall (freebsd-arm64), const IPV6_MAX_GROUP_SRC_FILTER = 512
pkg syscall (freebsd-arm64), const IPV6_MAX_GROUP_SRC_FILTER ideal-int
pkg syscall (freebsd-arm64), const IPV6_MAX_MEMBERSHIPS = 4095

pkg syscall, const IPPROTO_IP ideal-int
pkg syscall, const IPPROTO_IPV6 ideal-int
pkg syscall, const IPPROTO_TCP ideal-int
pkg syscall, const IPPROTO_UDP ideal-int
pkg syscall, const IPV6_JOIN_GROUP ideal-int
pkg syscall, const IPV6_LEAVE_GROUP ideal-int
pkg syscall, const IPV6_MULTICAST_HOPS ideal-int
pkg syscall, const IPV6_MULTICAST_IF ideal-int
pkg syscall, const IPV6_MULTICAST_LOOP ideal-int

			Mode:     0755 | c_ISUID,
			Size:     23232,
			ModTime:  time.Unix(1355405093, 0),
			Typeflag: TypeReg,
		},
		fm: 0755 | fs.ModeSetuid,
	}, {
		// setguid.
		h: &Header{
			Name:     "group.txt",
			Mode:     0750 | c_ISGID,
			Size:     0,
			ModTime:  time.Unix(1360602346, 0),
			Typeflag: TypeReg,
		},
		fm: 0750 | fs.ModeSetgid,
	}, {
		// sticky.
		h: &Header{