What Is a Patch?

A patch is a collection of files and directories that replace or update existing files and directories that are preventing proper execution of the software. The existing software is derived from a specified package format, which conforms to the Application Binary Interface. For details about packages, see Chapter 22, Managing Software (Overview).

A signed patch is a patch with a digital signature. A patch with a valid digital signature ensures that the patch has not been modified since the signature was applied. Using signed patches is a secure method of downloading or applying patches because the patches include a digital signature that can be verified before the patch is applied to your system. For more information about signed patches, see http:sunsolve.Sun.COM/pub-cgi/show.pl?target=patches/spfaq or http:sunsolve.Sun.COM/pub-cgi/show.pl?target=patches/spag.