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/usr/share/ircd-ratbox/help/opers/dline is in ircd-ratbox 3.0.8.dfsg-3+b1.

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DLINE [duration] <ip> :[reason]

Adds a DLINE to the ircd.conf or klines.conf file
which will deny any connections from the IP address
of the banned client.  The banned client will receive
a message saying he/she is banned with reason [reason]

Duration is optional, and is in minutes.

Administrators can also add a DLINE that can only be removed by
other administrators with the ADMINDLINE command.

- Requires Oper Priv: K