This assumes you have reviewed Getting Started with IBM Global Security Kit (GSKit).
In this example, a Key Database named "example.kdb" is created. The -stash option is not necessary, but is highly encouraged. The -stash option will store the password in the stash file (example.sth) so that you can simply use the -stashed option in subsequent commands which will get the password from the stash file, which is very handy when it comes to automation.
${install_root}/gsk8/bin/gsk8capicmd_64
-keydb
-create
-db example.kdb
-stash -pw your_password