DOS Undocumented
Submitted by: jeansy
Some "hidden" features":
ATTRIB ,
Same as ATTRIB -A -H -R *.* Quick way to change attributes of a dir.
COMMAND.COM /F
Always assume (F)ail on floppy drive errors.
DIR ,
Shows all files, hidden and system too!
FDISK /MBR
Write -only- a new master boot record.
TRUENAME
Shows path, ignoring SUBST, ASSIGN,...
VER /R
Show DOS revision number and status.
FORMAT /AUTOTEST
Format a floppy, no questions asked.
Walkthroughs 
