uux - remote system command execution
uux [ - ] [ -bcCjnprz ] [ -aname ] [ -ggrade ]
[ -x debug_level ] command-string
This command is available with the uucp software installation option.
Refer to for information on how to install optional software.
uux will gather 0 or more files from various systems, execute a command
on a specified system and send the standard output to a file on a spec-
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 pre-
fixed by `system-name!'. A null system-name is interpreted as the
Path names may be one of:
o a full pathname;
o a pathname preceded by ~username/; username is interpreted
as a username on the specified system and is replaced by
that user's login directory on that system;
o a pathname preceded by ~/destination/; the ~/ is replaced by
the "public UUCP" directory on the remote machine Note: this
destination will be treated as a file name unless more than
one file is being transferred by this request or the desti-
nation is already a directory. To ensure that it is a
directory, follow the destination with a '/'. For example
~/dan/ as the destination will make the directory
/usr/spool/uucppublic/dan if it does not exist and put the
requested file(s) in that directory;
o a partial pathname, which is prefixed by the pathname of
The `-' option sends the standard input to the uux command as the stan-
dard input to the command-string.
Any special shell characters such as <<>>, ;, and | should be quoted
either by quoting the entire command-string, or by 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 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, or if the command fails (that is, returns a non-zero exit
status). This notification can be turned off by the -n option. The
response comes by remote mail from the remote machine.
-b Return whatever standard input was provided to the uux command
if the job fails (that is, returns a non-zero exit status).
-c Do not copy local file to the spool directory for transfer to
the remote machine. This is the default.
-C Force the copy of local files to the spool directory for trans-
-j Output the jobid ASCII string on the standard output which is
the job identification. This job identification can be used by
uustat(1C) to obtain the status or terminate a job.
-n Do not return any indication by mail(1) of success or failure of
-p Same as `-': the standard input to uux is made the standard
input to the command-string.
-r Do not start uucico(8C), just queue the job.
-z Return an indication by mail even if the job succeeds (that is,
returns a zero exit status).
-aname Use name as the user identification replacing the initiator user
ID. Notification will be returned to the user.
grade is a single letter or number, from 0 to 9, A to Z, or a to
z; 0 is the highest grade, and z is the lowest grade. Lower
grades will transmit the job earlier during a particular conver-
sation. The default grade is A.
Produce debugging output on the standard output. debug_level is
a number between 0 and 9; higher numbers give more detailed
information. 5, 7, and 9 are good numbers to try; they give
increasing amounts of detail.
uux "!diff usg!/usr/dan/file1 pwba!/a4/dan/file2 >>
will get the file1 and file2 files from the usg and pwba machines, exe-
cute a diff(1) command and put the results in file.diff in the local
/var/spool/uucp spool directories
/etc/uucp/Permissions remote execution permissions
/etc/uucp/* other data
/usr/lib/uucp/* other programs
mail(1), uucp(1C), uustat(1C), uucico(8C)
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 execu-
tion will be put into this directory unless they already reside on that
machine. Therefore, the simple file name (without path or machine ref-
erence) 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).
When invoking uux from csh(1), the ! character must be prefixed by the
\ escape to inhibit csh's history mechanism. Quotes are not sufficient.
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.
8 June 1988 UUX(1C)