Figure 1: UUCP layout

/usr/bin
This contains the user commands, such as
cu              * interactive dialup access
uucp            * job scheduler
uudecode        * decode files
uuencode        * encode files
uulog           * show UUCP log files
uuname          * get UUCP names
uupick          * pick files
uustat          * get UUCP status
uuto            * send files
uux             * command execution

/usr/lib/uucp
Devices         * Device Configuration
Dialcodes       * Dial code prefix expansion
Dialers         * dialer programs
Maxuuscheds     * configuration parameters
Maxuuxqts       * configuration parameters
Permissions     * Security Controls
Poll            * Polling configuration
Sysfiles        * file configuration
Systems         * Calling System information
Uutry           * debugging/text program
remote.unknown  * handle unknown callers
uucheck         * check configuration files
uucico          * transfer program
uucleanup       * maintenance program
uudemon.admin   * maintenance program
uudemon.cleanu  * maintenance program
uudemon.hour    * maintenance program
uudemon.poll    * maintenance program
uugetty         * UUCP getty program
uusched         * UUCP job scheduler
uutry           * debugging/text program
uuxqt           * remote execution program