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     UUX(1)                                                     UUX(1)

          uux - unix to unix command execution

          uux [ options ] command-string

          Uux will gather zero or more files from various systems,
          execute a command on a specified system and then send stan-
          dard output to a file on a specified system.  Note that, for
          security reasons, many installations will limit the list of
          commands executable on behalf of an incoming request from
          uux. Many sites will permit little more than the receipt of
          mail (see mail(1)) via uux.

          The command-string is made up of one or more arguments that
          look like a Shell command line, except that the command and
          file names may be prefixed by system-name!.  A null system-
          name is interpreted as the local system.

          File names may be one of

               (1) a full path name;

               (2) a path name preceded by ~xxx where xxx is a login
               name on the specified system and is replaced by that
               user's login directory;

               (3) anything else is prefixed by the current directory.

          As an example, the command

               uux "!diff usg!/usr/dan/file1 pwba!/a4/dan/file2 >

          will get file1 and file2 from the `usg' and `pwba' machines,
          execute a diff command and put the results in file.diff in
          the local ~/dan/ directory.

          Any special shell characters such as <>;| should be quoted
          either by quoting the entire command-string, or quoting the
          special characters as individual arguments.

          Uux will attempt to get all files to the execution system.
          For files that are output files, the file name must be
          escaped using parentheses.  For example, the command

               uux a!cut -f1 b!/usr/file \(c!/usr/file\)

          gets /usr/file from system `b' and send it to system `a',

     UUX(1)                                                     UUX(1)

          performs a cut command on that file and send the result of
          the cut command to system `c'.

          Uux will notify you by mail if the requested command on the
          remote system was disallowed.  This notification can be
          turned off by the -n option.

          The following options are interpreted by uux:

          -    The standard input to uux is made the standard input to
               the command-string.

               Use name as the user identification replacing the ini-
               tiator user-id.  (Notification will be returned to the

          -b   Return standard input to the command if the exit status
               is non-zero.

          -c   Don't copy local file to the spool directory for trans-
               fer to the remote machine (default).

          -C   Force the copy of local files to the spool directory
               for transfer.

               Grade is a single letter/number; lower ASCII sequence
               characters will cause the job to be transmitted earlier
               during a particular conversation.

          -j   Output the jobid ASCII string on the standard output
               which is the job identification.  This job identifica-
               tion can be used by uustat to obtain the status or ter-
               minate a job.

          -n   Do not notify the user if the comand fails.

          -p   Same as -: The standard input to uux is made the stan-
               dard input to the command-string.

          -r   Don't start the file transfer, just queue the job.

               Report status of the transfer in file.

               Produce debugging output on stdout.  The debug_level is
               a number between 0 and 9; higher numbers give more
               detailed information.

          -z   Notify the user if the command succeeds.

     UUX(1)                                                     UUX(1)

          /usr/lib/uucp/spool   spool directories
          /usr/lib/uucp/*       other data and programs


          Only the first command of a shell pipeline may have a
          system-name!.  All other commands are executed on the system
          of the first command.
          The use of the shell metacharacter * will probably not do
          what you want it to do.  The shell tokens << and >> are not

          The execution of commands on remote systems takes place in
          an execution directory known to the uucp system.  All files
          required for the execution will be put into this directory
          unless they already reside on that machine.  Therefore, the
          simple file name (without path or machine reference) must be
          unique within the uux request.  The following command will
          NOT work:

               uux "a!diff  b!/usr/dan/xyz c!/usr/dan/xyz > !xyz.diff"

          but the command

               uux "a!diff  a!/usr/dan/xyz c!/usr/dan/xyz > !xyz.diff"

          will work.  (If diff is a permitted command.)

          Protected files and files that are in protected directories
          that are owned by the requester can be sent in commands
          using uux. However, if the requester is root, and the direc-
          tory is not searchable by "other" or the file is not read-
          able by "other", the request will fail due to a bug in