The E Command
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master: `E FROM TO USER -OPTIONS TEMP MODE NOTIFY SIZE COMMAND'
     The `E' command is only supported by Taylor UUCP 1.04 and up.  It
     is used to make an execution request without requiring a separate
     `X.*' file.  See Execution File Format.  It is only used when
     the command to be executed requires a single input file which is
     passed to it as standard input.

     All the fields have the same meaning as they do for an `S' command,
     except for OPTIONS and COMMAND.

    OPTIONS
          A list of options to control the transfer.  The following
          options are defined (all options are single characters):
         `C'
               The file has been copied to the spool directory (the
               master should use TEMP rather than FROM).

         `c'
               The file has not been copied to the spool directory
               (this is the default).

         `N'
               No mail message should be sent, even if the command
               fails.  This is the equivalent of the `N' command in an
               `X.*' file.

         `Z'
               A mail message should be sent if the command fails (this
               is generally the default in any case).  This is the
               equivalent of the `Z' command in an `X.*' file.

         `R'
               Mail messages about the execution should be sent to the
               address in the NOTIFY field.  This is the equivalent of
               the `R' command in an `X.*' file.

         `e'
               The execution should be done with `/bin/sh'.  This is the
               equivalent of the `e' command in an `X.*' file.

    COMMAND
          The command which should be executed.  This is the equivalent
          of the `C' command in an `X.*' file.

     The slave then responds with an `E' command response.  These are
     the same as the `S' command responses, but the initial character is
     `E' rather than `S'.

     If the slave responds with `EY', the file transfer begins.  When
     the file transfer is complete, the slave sends a `C' command
     response, just as for the `S' command.  After a successful file
     transfer, the slave is responsible for arranging for the command
     to be executed.  The transferred file is passed as standard input,
     as though it were named in the `I' and `F' commands of an `X.*'
     file.

     After the `C' command response has been received (in the `EY'
     case) or immediately (in an `EN' case) the master will send another
     command.