uux(1)
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uux Command
UNIX-to-UNIX system command execution
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SYNTAX
uux [ options ] command-string
DESCRIPTION
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,
permiting only the receipt of mail (see mail(1)). (Remote
execution permissions are defined in /usr/lib/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 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 >
!~/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 individual arguments.
uux will attempt to get all files to the execution system. For
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uux(1)
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 "c".
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 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 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
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uux(1)
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.
FILES
/usr/lib/uucp/spool spool directories
/usr/lib/uucp/Permissions
remote execution permissions
/usr/lib/uucp/* other data and programs
SEE ALSO
cut(1), mail(1), uucp(1C), uustat(1C).
WARNINGS
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.)
BUGS
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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