uux - UNIX system to UNIX system command execution
uux [options] command-string
uux gathers zero or more files from various systems, executes a
command on a specified system, then sends standard output to a file on
a specified system. Note that, for security reasons, many
installations 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), mailx(1), and elm(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
File names can 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. Note that if an invalid login is specified, the
default will be to the public directory
+ A path name preceded by ~/destination where destination is
appended to /var/spool/uucppublic.
+ A simple file name (which is prefixed by the current
directory). See uucp(1) for details.
For example, the command
uux "!diff usg!/usr/dan/file1 pwba!/a4/dan/file2 >>>>
gets files file1 and file2 from machines usg and pwba, and executes a
diff(1) command, placing the results in file.diff in the local
Any special shell characters such as <<<<, >>>>, ;, or | should be quoted,
either by quoting the entire command-string, or quoting the special
characters as individual arguments.
uux attempts 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
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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
command on the file, and sends the result of the cut command to system
uux notifies you if the requested command on the remote system was
disallowed. The list of commands allowed is specified in the
Permissions file in /etc/uucp. The response comes by remote mail from
the remote machine.
uux recognizes the following options:
- 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 is returned to the
-b Return whatever standard input was provided to the
uux command if the exit status is non-zero.
-c Do not copy the 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 cause the job to be
transmitted earlier during a particular
-j Output the jobid (the job identification ASCII
string) on the standard output. This job
identification can be used by uustat to obtain the
status or terminate a job (see uustat(1)).
-n Do not notify the user if the command fails.
-r Do not start the file transfer, just queue the
-sfile Report status of the transfer in file.
-xdebug_level Produce debugging output on standard output. The
debug_level is a number between 0 and 9. The
higher the number, the more detailed the
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-z Send success notification to user.
Only the first command of a shell pipeline can 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 subsystem. All files required
for the execution are 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 does 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"
works (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 directory is not searchable by other,
the request fails.
/etc/uucp configuration files
/var/uucp log and error files
/var/spool/uucp spool directories
/var/spool/locks lock files
/var/spool/uucppublic public directory
mail(1), uuclean(1M), uucp(1).
Tim O'Reilly and Grace Todino,
Managing UUCP and Usenet, O'Reilly & Associates, Inc. USA.
Grace Todino and Dale Dougherty,
Using UUCP and Usenet, O'Reilly & Associates, Inc. USA.
uux: SVID2, SVID3, XPG2, XPG3, XPG4
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