a.out \*- assembler and link editor output
archive \*- ar (library) file format
ascii \*- map of ASCII character set
core \*- format of core image file
dir \*- format of directories
dump \*- incremental dump tape format
fs \*- format of file system volume
greek \*- graphics for extended TTY-37 type-box
group \*- group file
mtab \*- mounted file system table
passwd \*- password file
tabs \*- set tab stops
tp \*- DEC/mag tape formats
ttys \*- typewriter initialization data
utmp \*- user information
wtmp \*- user login history
