Other Spool Subdirectories
--------------------------

`.Sequence'
     This directory holds conversation sequence number files.  These
     are used if the `sequence' command is used for a system (
see Miscellaneous (sys).).  The sequence number for the system
     SYSTEM is stored in the file `.Sequence/SYSTEM'.  It is simply
     stored as a printable number.

`.Temp'
     This directory holds data files as they are being received from a
     remote system, before they are moved to their final destination.
     For file send requests which use a valid temporary file name in
     the TEMP field of the `S' or `E' command (see The S Command.),
     `uucico' receives the file into `.Temp/SYSTEM/TEMP', where SYSTEM
     is the name of the remote system, and TEMP is the temporary file
     name.  If a conversation fails during a file transfer, these files
     are used to automatically restart the file transfer from the point
     of failure.

     If the `S' or `E' command does not include a temporary file name,
     automatic restart is not possible.  In this case, the files are
     received into a randomly named file in the `.Temp' directory
     itself.

`.Preserve'
     This directory holds data files which could not be transferred to a
     remote system for some reason (for example, the data file might be
     large, and exceed size restrictions imposed by the remote system).
     When a locally requested file transfer fails, `uucico' will store
     the data file in the `.Preserve' directory, and send mail to the
     requestor describing the failure and naming the saved file.

`.Received'
     This directory records which files have been received.  If a
     conversation fails just after `uucico' acknowledges receipt of a
     file, it is possible for the acknowledgement to be lost.  If this
     happens, the remote system will resend the file.  If the file were
     an execution request, and `uucico' did not keep track of which
     files it had already received, this could lead to the execution
     being performed twice.

     To avoid this problem, when a conversation fails, `uucico' records
     each file that has been received, but for which the remote system
     may not have received the acknowledgement.  It records this
     information by creating an empty file with the name
     `.Received/SYSTEM/TEMP', where SYSTEM is the name of the remote
     system, and TEMP is the TEMP field of the `S' or `E' command from
     the remote system (see The S Command.).  Then, if the remote
     system offers the file again in the next conversation, `uucico'
     refuses the send request and deletes the record in the `.Received'
     directory.  This approach only works for file sends which use a
     temporary file name, but this is true of all execution requests.