## The SYS Directory

The directory `/d0/SYS` contains two important files:

password | the system password file (see login command)
motd | message of the day file, displayed during login
errmsg | the error message file

These files (and the `SYS` directory itself) are not absolutely required to boot OS-9, they are needed if login, tsmon, or printerr will be used. Users may add other system-wide files of similar nature if desired.