Execute - Contains instructions for running commands that
require the resources of a remote system
/usr/spool/uucp/SystemName/X.RemoteSystemNxxxx
The Execute (X.*) files contain instructions for running
uucp commands that require the resources of a remote system.
They are created by the uux command. The full pathname
of a uux command execute file is a form of the following:
/usr/spool/uucp/SystemName/X.RemoteSystemNxxxx
where the SystemName directory is named for the local computer
and the RemoteSystem directory is named for the
remote system. The N character represents the grade of
the work, and the xxxx notation is the 4-digit hexadecimal
transfer-sequence number; for example, X.zeusN2121.
Note that the grade of the work specifies when the file is
to be transmitted during a particular connection. The
grade notation is a single number (0 to 9) or letter (A to
Z, a to z). Lower sequence characters cause the file to
be transmitted earlier in the connection than do higher
sequence characters. The number 0 (zero) is the highest
grade, signifying the earliest transmittal; z is the lowest
grade, signifying the latest transmittal. The default
grade is N.
Standard Entries in an Execute File [Toc] [Back]
An execute file consists of several lines, each with an
identification character and one or more entries: Format
and Description U UserName SystemName
Specifies the login name of the user issuing the
uux command and the name of the system from which
the command was issued. N or Z
Indicates the error status.
The N character means that a failure message is not
sent to the user issuing the uux command if the
specified command does not execute successfully on
the remote system.
The Z character means that a failure message is
sent to the user issuing the uux command if the
specified command does not execute successfully on
the remote system. R UserName
Specifies the login ID of the user requesting the
remote command execution. F FileName
Contains the names of the files required to execute
the specified command on the remote system. The
FileName parameter can be either the complete pathname
of the file, including the unique transmission
name assigned by the uucp program, or simply the
transmission name without any path information.
The Required File Line can contain zero or more
filenames. The uuxqt daemon checks for the existence
of all listed files before running the specified
command. I FileName
Specifies the standard input to be used.
The standard input is either specified by a < (less
than) symbol in the command string, or is inherited
from the standard input of the uux command if that
command was issued with the - (dash) flag. If standard
input is specified, it also is listed in an F
(Required File) line. If standard input is not
specified, the uucp program uses the /dev/null
device file. O FileName SystemName
Specifies the names of the file and system that are
to receive standard output from the execution of
the command. Standard output is specified by a >
(greater than) symbol within the command string.
(The >> sequence is not valid in uux commands.) As
was the case with standard input, if standard output
is not specified, the uucp program uses the
/dev/null device file. C CommandString
This is the command string that the user requests
to be run on the specified system. The uucp program
checks the /usr/lib/uucp/Permissions file on
the designated computer to see whether the login ID
can run the command on that system. All required
files go to the execute file directory, usually
/usr/spool/uucp/.Xqtdir. After execution, the standard
output is sent to the requested location
User fong on local system zeus enters the following command:
uux - "diff /u/fong/out hera!/u/fong/out2 >
~uucp/DF"
This invokes the uux command to run a diff command
on the local system, comparing file /u/fong/out
with file /u/fong/out2, which is stored on remote
system hera. The output of the comparison is
placed in the DF file in the public directory on
the local system.
This command produced the
/usr/spool/uucp/hera/X.zeusN212F execute file,
which contains the following information:
U fong zeus # return status on failure Z # return
address for status or input return R fong F
/usr/spool/uucp/hera/D.herale954fd out2 O ~uucp/DF
zeus C diff /u/fong/out out2
The user line identifies user fong on system zeus.
The error status line indicates that fong will
receive a failure status message if the diff command
fails to execute. The requester is fong, and
the file required to execute the command is the
following data file:
/usr/spool/uucp/hera/D.herale954fd out2
The output of the command is to be written to the
public directory on system zeus with the filename
DF. (Remember that ~uucp is the shorthand way of
specifying the public directory.) The final line
is the command string that user fong entered with
the uux command. The following is another example
of an execute file:
U uucp hera # don't return status on failure N #
return address for status or input return R uucp F
D.hera5eb7f7b I D.hera5eb7f7b C rmail fong
This indicates that user uucp on system hera is
sending mail to user fong, who is also working on
system hera.
Describes access permissions for remote systems Describes
accessible remote systems Contains uucp command, data, and
execute files Contain instructions for transfers Contains
lists of commands that remote systems are permitted to
execute Contains files that have been transferred
Daemons: uuxqt
Commands: diff(1), uux(1)
Execute(4)
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