.xx "a.out" "assembler and link editor output (a16.out when cross-support)"
.xx "acct" "execution accounting file"
.xx "aliases" "aliases file for delivermail"
.xx "ar" "archive (library) file format"
.xx "core" "format of memory image file"
.xx "dir" "format of directories"
.xx "disk" "format of a disk header"
.xx "dump" "incremental dump format"
.xx "environ" "user environment"
.xx "filsys" "format of file system volume"
.xx "fstab" "static information about the filesystems"
.xx "gettytab" "terminal line description database"
.xx "group" "group file"
.xx "mtab" "mounted file system table"
.xx "passwd" "password file"
.xx "plot" "graphics interface"
.xx "sccsfile" "format of SCCS file"
.xx "stab" "symbol table format"
.xx "termcap" "terminal capability data base"
.xx "ttys" "terminal initialization data"
.xx "ttytype" "data base of terminal types by port"
.xx "types" "primitive system data types"
.xx "utmp" "login records"
.xx "uuencode" "format of an encoded uuencode file"
.xx "wtmp" "user login history"
