uux - UNIX-to-UNIX system 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 standard output to a file on
a specified system.
NOTE: 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 /etc/uucp/Permissions.)
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
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
(3) anything else is prefixed by the current directory.
As an example, the command
uux "!diff usg!/usr/dan/file1 pwba!/a4/dan/file2 > !~/dan/file.diff"
will get the file1 and file2 files from the ``usg'' and ``pwba''
machines, execute a diff(1) command and put the results in file.diff in
the local PUBDIR/dan/ directory.
Any special shell characters such as <>;| should be quoted either by
quoting the entire command-string, or quoting the special characters as
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 sends it to system "a", performs a cut
command on that file and sends the result of the cut command to system
uux will notify 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.
The following options are interpreted by uux:
- The standard input to uux is made the standard input to the
-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
-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 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.
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.
/var/spool/uucp spool directories
/etc/uucp/Permissions remote execution permissions
/etc/uucp/* uucp system data files
/usr/lib/uucp/* uucp administrative programs
cut(1), mail(1), uucp(1C), uustat(1C).
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 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 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.
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