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Questions about realport driver on Linux

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My questions are as follows;

The realport driver for Linux states that a printer should be set up as
DG01:2345:once:cat < /dev/ttyaa11 > /dev/null &
dg01:2345:once:ditty-rp 38400 ctspace altpin -ixon -ixoff

Im not sure what the first part cat < /dev/tty....
is doing. My guess is that it clears the port am I right ? If I issue this on the command line it just sits there forever. The command ends with '&' which says do this in the background. Ive tried this as well and the command just hangs. Ive also tried the ditty-rp to see if it affects the other command, but it doesnt seem to. The other command just hangs there. During the init, it seems to go away, because I dont see anything left over in a ps -ef output. Can anyone elaborate on what is really going on here ?
asked Jun 3, 2004 in Realport by AnthonyD New to the Community (3 points)

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1 Answer

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The cat command essentially "holds" the port open. This allows the following ditty-rp settings to "stick" on the port to keep the settings after a system reboot. It does run in the background and does not affect the functionality of the port (i.e. it does not block the port).
answered Jun 3, 2004 by userid0 Veteran of the Digi Community (2,158 points)