Command - Contains file transfer directions for the uucico
daemon
/usr/spool/uucp/LocalSystemName/C.SystemNamexxxx###
Command (C.*) files contain the directions that the uucp
uucico daemon follows when transferring files. The full
pathname of a command file is a form of the following:
/usr/spool/uucp/SystemName/C.SystemNameNxxxx
/C.SystemName indicates the name of the remote system. N
represents the grade of the work, and xxxx is the 4-digit
hexadecimal transfer-sequence number; for example, C.merlinCE01F.
The grade of the work specifies when the file is to be
transmitted during a particular connection. The grade
notation has the following characteristics: It 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.
A command file consists of a single line that includes the
following kinds of information in the following order: An
S (send) or R (receive) notation. Note that a send command
file is created by the uucp or uuto commands; a receive
command file is created by the uux command. The full
pathname of the source file being transferred. A receive
command file does not include this entry. The full pathname
of the destination file, or a pathname preceded by
~user (tilde user), where user is a login name on the
specified system. Here, the tilde is shorthand for the
name of the user's home directory. The sender's login
name. A list of the options, if any, included with the
uucp, uuto, or uux command. The name of the data file
associated with the command file in the spooling directory.
This field must contain an entry. If one of the
data-transfer commands (such as the uucp command with the
default -c flag) does not create a data file, the uucp
program instead creates a placeholder with the name D.0
for send files, or dummy for receive files. The source
file permissions code, specified as a 3-digit octal number
(for example, 777). The login name of the user on the
remote system who is to be notified when the transfer is
complete.
Examples of send command and receive command files follow.
Examples of Two Send Command Files [Toc] [Back]
The send command file /usr/spool/uucp/venus/C.heraN1133,
created with the uucp command, contains the following
fields:
S /u/betp/f1 /usr/spool/uucppublic/f2 betp .nL
-dC D.herale3655 777 jmp
The fields are as follows: The S keyword denotes
that the uucp command is sending the file. The
full pathname of the source file is /u/betp/f1.
The full pathname of the destination is
/usr/spool/uucppublic/f2, where /usr/spool/uucppublic
is the name of the uucp public spooling directory
on the remote computer and f2 is the new name
of the file.
Note that when the user's login ID is uucp, the
destination name may be abbreviated as ~ uucp/f2.
Here, the ~ (tilde) is a shorthand way of designating
the public directory. The person sending the
file is betp. The sender entered the uucp command
with the -C flag, specifying that the uucpcommand
program should transfer the file to the local
spooling directory and create a data file for it.
(The -d flag, which specifies that the command
should create any intermediate directories needed
to copy the source file to the destination, is the
default.) The name of the Data (D.*) file is
D.herale3655, which the uucp command assigns. The
octal permissions code is 777. On system hera, jmp
is the login name of the user who is to be notified
of the file arrival. The
/usr/spool/uucp/hera/C.zeusN3130 send command file,
produced by the uuto command, is as follows:
S /u/betp/out ~/receive/msg/zeus betp .nL
-dcn D.0 777[4~ msg
The S denotes that the /u/betp/out source file was
sent to the receive/msg subdirectory in the public
spooling directory on system zeus by user betp.
The uuto command used the default flags -d (create
directories), -c (transfer directly, no spooling
directory or data file), and -n (notify recipient).
Note that the uuto command creates the receive/msg
directory if it does not already exist. The D.0
notation is a placeholder, 777 is the permissions
code, and msg is the recipient.
Example of a Receive Command File [Toc] [Back]
The format of a receive command file is somewhat different
from that of a send command file. When files required to
run a specified command on a remote system are not present
on that system, the uux command creates a receive command
file.
For example, the following command produces the
/usr/spool/uucp/zeus/C.heraR1e94 receive command file: uux
- "diff /u/betp/out hera!/u/betp/out2 > ~uucp/DF"
Note that the command in this example invokes the uux command
to run a diff command on the local system, comparing
file /u/betp/out with file /u/betp/out2, which is stored
on remote system hera. The output of the comparison is
placed in file DF in the public directory on the local
system.
The actual receive command file looks like this:
R /u/betp/out2 D.hera1e954fd betp - dummy 0666 betp
The R denotes a receive file. The uucico daemon, called
by the uux command, gets the /u/betp/out2 file from system
hera, and places it in a data file called D.hera1e954fd
for the transfer. Once the files are transferred, the
uuxqt daemon executes the command on the specified system.
User betp issued the uux command with the - (dash) flag,
which makes the standard input to the uux command the
standard input to the actual command string. No data file
was created in the local spooling directory, so the uucp
program uses dummy as a placeholder. The permissions code
is 666 (the uucp program prefixes the 3-digit octal code
with a 0 [zero]), and user betp is to be notified when the
command finishes executing.
Describes access permissions for remote systems Describes
accessible remote systems Contains uucp command, data, and
execute files Contain data to be transferred Contains
transferred files
Commands: uucp(1), uupick(1), uuto(1), uux(1), uuxqt(1),
uudemon(4), cron(8), uucico(8), uusched(8)
Command(4)
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