uux - UNIX-to-UNIX system command execution
uux [-] [-bcCjnprz] [-a name] [-g grade] [-s filename] [-x debug_level] command-string
The uux utility 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 system.
File names may be one of the following:
Anything else is prefixed by the current directory.
As an example, the command:
example% uux "!diff sys1!/home/dan/filename1 \ sys2!/a4/dan/filename2 > !~/dan/filename.diff"
will get the filename1 and filename2 files from the sys1 and sys2 machines, execute a diff(1) command and put the results in filename.diff in the local PUBDIR/dan/ directory. PUBDIR is a public directory defined in the uucp source. By default, this directory is /var/spool/uucppublic.
Any special shell characters (such as < > ; |) should be quoted either by quoting the entire command-string, or quoting the special characters as individual arguments. The redirection operators >>, <<, >|, and >& cannot be used.
uux will attempt to get all appropriate files to the specified system where they will be processed. For files that are output files, the file name must be escaped using parentheses. For example, the command:
example% uux "a!cut -f1 b!/usr/filename > c!/usr/filename"
gets /usr/filename 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 supported:
See environ(5) for descriptions of the following environment variables that affect the execution of uux: LANG, LC_ALL, LC_CTYPE, LC_MESSAGES, and NLSPATH.
The following exit values are returned:
See attributes(5) for descriptions of the following attributes:
cut(1), mail(1), uucp(1C), uuglist(1C), uustat(1C), attributes(5), environ(5), standards(5)
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:
example% uux "a!diff b!/home/dan/xyz c!/home/dan/xyz > !xyz.diff"
But the command:
example% uux "a!diff a!/home/dan/xyz c!/home/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 requester can be sent in commands using uux. However, if the requester is root, and the directory is not searchable by "other", the request will fail.
The following restrictions apply to the shell pipeline processed by uux:
uux "c89 remsys!~/*.c"
would attempt to copy the file named literally *.c to the local system.
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Created 1996-2023 by Maxim Chirkov
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