NIO CommKit Host Interface Installation and System Administration Manual

3-32

Control Tables (from AT&T 255-110-127)

dkdotab

Use this section as an aid in the editing of /etc/opt/dk/dkdotab. Refer also to

the dkdotab(4) manual page.

The CommKit Host Interface software package includes a sample dkdotab

ﬁle found in the directory /etc/opt/dk. Edit the same ﬁle to reﬂect your own

community of interest.

Within a typical network, it is not always possible to support the same or all

of a set of commands on all of the hosts in the data switch network. The

CommKit Host Interface software allows execution of a given command

from a remote host.

The dkdo command allows emulation of commands on a host requiring

facilities not present on the local host. When executing a command on a

local host that does not support the given command, dkdo searches the

/etc/opt/dk/dkdotab ﬁle for the remote host on which the command should be

executed. dkdo then places a call through the data switch network to the

host that supports the speciﬁed command. It sends any input ﬁles and argu-

ments to the remote system, executes the command there, and brings back

any output ﬁles. The input ﬁles are placed in a new directory in /tmp on the

remote host, and any output ﬁles created as a result of execution of the com-

mand are brought back to the local host on the command’s completion. The

input ﬁles in /tmp are removed after the command is executed. The function

of the dkdo command is controlled by a dkdotab control table that, unless

speciﬁed, defaults to the /etc/opt/dk/dkdotab ﬁle. This ﬁle describes where

commands are to be executed and the format of the arguments passed to

these commands.

Each dkdotab table entry is presented as follows:

command system flags options files

The table consists of one or more lines, each with ﬁve tab-separated ﬁelds as

shown above. Each time the command dkdo is executed, it scans this

dkdotab ﬁle for the ﬁrst match with the command requested. If a match is

found, the remaining ﬁelds indicate:

system the host on which the command should be executed