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CentOS 7.0 - man page for radwho (centos section 1)

RADWHO(1)					  FreeRADIUS Daemon					    RADWHO(1)

radwho - show online users
radwho [-c] [-d raddb_directory] [-F radutmp_file] [-i] [-n] [-N nas_ip_address] [-p] [-P nas_port] [-r] [-R] [-s] [-S] [-u user] [-U user] [-Z]
The FreeRADIUS server can be configured to maintain an active session database in a file called radutmp. This utility shows the content of that session database.
-c Shows caller ID (if available) instead of the full name. -d raddb_directory The directory that contains the RADIUS configuration files. Defaults to /etc/raddb. -F radutmp_file The file that contains the radutmp file. If this is specified, -d is not necessary. -i Shows the session ID instead of the full name. -n Normally radwho looks up the username in the systems password file, and shows the full username as well. The -n flags prevents this. -N nas_ip_address Show only those entries which match the given NAS IP address. -p Adds an extra column for the port type - I for ISDN, A for Analog. -P nas_port Show only those entries which match the given NAS port. -r Outputs all data in raw format - no headers, no formatting, fields are comma-separated. -R Output all data in RADIUS attribute format. All fields are printed. -s Show full name. -S Hide shell users. Doesn't show the entries for users that do not have a SLIP or PPP session. -u user Show only those entries which match the given username (case insensitive). -U user Show only those entries which match the given username (case sensitive). -Z When combined with -R, prints out the contents of an Accounting-Request packet which can be passed to radclient, in order to "zap" that users session from radutmp. For example, $ radwho -ZRN | radclient -f - radius.example.net acct testing123 will result in all an Accounting-Request packet being sent to the RADIUS server, which tells the server that the NAS rebooted. i.e. It "zaps" all of the users on that NAS. To "zap" one user, specifiy NAS, username, and NAS port: $ radwho -ZRN -u user -P 10 | radclient -f - radius.example.net acct testing123 Other combinations are also possible.
radiusd(8), radclient(1), radiusd.conf(5).
Miquel van Smoorenburg, miquels@cistron.nl. 17 Feb 2013 RADWHO(1)

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