This assumes you have reviewed IBM GSKit (Global Security Kit) - Getting Started (command line) or IBM iKeyman - Getting Started (GUI) and that you have created a key database, and that there is at least one certificate in the key database.
In this example, the details of the certificate named "default" will be displayed.
ihs_home/gsk8/bin/gsk8capicmd_64 \ -cert \ -details \ -db /path/to/example.kdb \ -stashed or -pw your_password \ -label "default"
Highlight the certificate you want to view. Select View/Edit, and the certificate details will be displayed.