Scroll to navigation



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.


Shows caller ID (if available) instead of the full name.
The directory that contains the RADIUS configuration files. Defaults to /etc/raddb.
The file that contains the radutmp file. If this is specified, -d is not necessary.
Shows the session ID instead of the full name.
Normally radwho looks up the username in the systems password file, and shows the full username as well. The -n flags prevents this.
Show only those entries which match the given NAS IP address.
Adds an extra column for the port type - I for ISDN, A for Analog.
Show only those entries which match the given NAS port.
Outputs all data in raw format - no headers, no formatting, fields are comma-separated.
Output all data in RADIUS attribute format. All fields are printed.
Show full name.
Hide shell users. Doesn't show the entries for users that do not have a SLIP or PPP session.
Show only those entries which match the given username (case insensitive).
Show only those entries which match the given username (case sensitive).
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 - 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, specify NAS, username, and NAS port:

$ radwho -ZRN -u user -P 10 | radclient -f - acct testing123

Other combinations are also possible.


radiusd(8), radclient(1), radiusd.conf(5).


Miquel van Smoorenburg,

17 Feb 2013