UUX(1C)                              BSD                               UUX(1C)



NAME
     uux - UNIX-to-UNIX system command execution

SYNOPSIS
     uux [ options ] command-string

DESCRIPTION
     uux gathers zero or more files from various systems, executes a command
     on a specified system, and then sends standard output to a file on a
     specified system.

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

     Filenames may be one of the following:  a full path name 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; anything else is prefixed by the
     current directory.

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

     uux attempts to get all files to the execution system.  For output files,
     the filename must be escaped using parentheses.  uux notifies you if the
     requested command on the remote system was disallowed.  This notification
     can be turned off by the -n option.  The response comes by remote mail
     from the remote machine.

OPTIONS
     The following options are interpreted by uux:

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

     -aname    Use name as the user identification replacing the initiator
               user-id.  (Notification will be returned to the user.)

     -b        Return whatever standard input was provided to the uux command
               if the exit status is non-zero.

     -c        Do not copy local file to the spool directory for transfer to
               the remote machine (default).

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

     -ggrade   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 identification can be used by
               uustat(1) to obtain the status or terminate a job.

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

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

     -r        Do not start the file transfer, just queue the job.

     -sfile    Report status of the transfer in file.

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

     -z        Send success notification to the user.

NOTES
     For security reasons, most installations limit the list of commands
     executable on behalf of an incoming request from uux, permitting only the
     receipt of mail (see mail(1)).  (Remote execution permissions are defined
     in /usr/lib/uucp/Permissions.)

EXAMPLES
     The command

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

     gets /usr/file from system b and sends it to system a, performs a cut(1)
     command on that file and sends the result of the cut command to system c.

     The command

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

     will get the file1 and file2 files from the machines usg and pwba,
     execute a diff(1) command, and put the results in file.diff in the local
     PUBDIR/dan/ directory.

BUGS
     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 implemented.

     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 filename (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(1) is a permitted command.)

     Protected files and files that are in protected directories that are
     owned by the requestor can be sent in commands using uux.  However, if
     the requestor is root, and the directory is not searchable by "other",
     the request will fail.

FILES
     /usr/lib/uucp/spool      Spool directories
     /usr/lib/uucp/Permissions
                              Remote execution permissions
     /usr/lib/uucp/*          Other data and programs

SEE ALSO
     mail(1), uucp(1C), uustat(1C),
     Domain/OS System Administration Reference.