jdb can return it's version, but the option "-version" is undocumented in jdb -help.

% jdb -version
This is jdb version 1.5 (J2SE version 1.5.0)

% jdb -help
Usage: jdb <options> <class> <arguments>

where options include:
    -help print out this message and exit
    -sourcepath <directories separated by ":">
                      directories in which to look for source files
    -attach <address>
                      attach to a running VM at the specified address using standard connector
    -listen <address>
                      wait for a running VM to connect at the specified address using standard connector
    -listenany
                      wait for a running VM to connect at any available address using standard connector
    -launch
                      launch VM immediately instead of waiting for 'run' command
    -listconnectors list the connectors available in this VM
    -connect <connector-name>:<name1>=<value1>,...
                      connect to target VM using named connector with listed argument values
    -dbgtrace [flags] print info for debugging jdb
    -tclient run the application in the Hotspot(tm) Performance Engine (Client)
    -tserver run the application in the Hotspot(tm) Performance Engine (Server)

options forwarded to debuggee process:
    -v -verbose[:class|gc|jni]
                      turn on verbose mode
    -D<name>=<value> set a system property
    -classpath <directories separated by ":">
                      list directories in which to look for classes
    -X<option> non-standard target VM option

<class> is the name of the class to begin debugging
<arguments> are the arguments passed to the main() method of <class>

For command help type 'help' at jdb prompt

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