12-21-2010
The answer is quite simple: single quotes, unlike double quotes, won't interpolate the content of the variable, but take the string as is. See
perldoc perlop for details on quoting.
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CDPR(8) System Manager's Manual CDPR(8)
NAME
cdpr - Cisco Discovery Protocol Reporter
SYNOPSIS
cdpr [-h] [-t seconds ] [-d device | -r pcap-file ] [-u server-config-file ] [-l location ] [-n hostname ] [-s server ] [-p script-path ]
DESCRIPTION
cdpr listens on specified network interfaces for Cisco Discovery Protocol packets. It then decodes those packets and outputs the informa-
tion, optionally sending the information to a server for processing.
OPTIONS
-d device
Specify device to use (eth0, hme0, etc.)
-r pcap-file
Specify file to read from instead of network device.
-h Print the usage.
-t seconds
Time in seconds to abort waiting for a packet (should be > 60)
-v[vv] Set verbose mode.
-u server-config-file
Send cdpr information to a cdpr server. See /usr/share/doc/cdpr/README.cdprs
-l location
Location/description of this port; for use with -u or -s and -p.
-n hostname
Override the hostname reported to the server; for use with -u or -s and -p.
-s server
Server to send information to, specify port with a: after server/IP. Example: 192.168.1.20:88 (default: 80) requires -p (overridden
by -u)
-p script-path
Path of server script to send data to; requires -s (overridden by -u)
AUTHOR
Lance O'Connor <lance at ronnoco dot net>
This manual page was written by Matt Zagrabelny <mzagrabe at d dot umn dot edu>, for the Debian system (but may be used by others).
User Manuals APRIL 2009 CDPR(8)