UUCP Protocol Commands

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UUCP Protocol Commands
----------------------

   Each protocol supports a method for sending a command to the remote
system.  This method is used to transmit a series of commands between
the two UUCP packages.  At all times, one package is the master and the
other is the slave.  Initially, the calling UUCP is the master.

   If a protocol error occurs during the exchange of commands, both
sides move immediately to the final handshake.

   The master will send one of five commands: `S', `R', `X', `E', or
`H'.

   Any file name referred to below is either an absolute file name
beginning with `/', a public directory file name beginning with `~/', a
file name relative to a user's home directory beginning with `~USER/',
or a spool directory file name.  File names in the spool directory are
not absolute, but instead are converted to file names within the spool
directory by UUCP.  They always begin with `C.' (for a command file
created by `uucp' or `uux'), `D.' (for a data file created by `uucp',
`uux' or by an execution, or received from another system for an
execution), or `X.' (for an execution file created by `uux' or received
from another system).

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