Command(4)Command(4)NAMECommand - Contains file transfer directions for the uucico daemon
SYNOPSIS
/usr/spool/uucp/LocalSystemName/C.SystemNamexxxx###
DESCRIPTIONCommand (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.SystemNa‐
meNxxxx
/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 dur‐
ing 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 com‐
mand. 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
Examples of send command and receive command files follow.
Examples of Two Send Command Files
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 com‐
puter 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 short‐
hand way of designating the public directory. The person send‐
ing 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 com‐
mand 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 spool‐
ing 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
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 per‐
missions 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 fin‐
ishes executing.
FILES
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
SEE ALSO
Commands: uucp(1), uupick(1), uuto(1), uux(1), uuxqt(1), uudemon(4),
cron(8), uucico(8), uusched(8)Command(4)
