Patches are identified by unique alphanumeric strings, with the patch base code first, a hyphen, and a number that represents the patch revision number. For example, patch 108528-10 is a SunOS 5.8 kernel update patch.
Use the patchadd -p command to display information about patches installed on your system.
$ patchadd -p |
Use the following command to verify whether a specific patch is installed on your system.
$ patchadd -p | grep 111879 |