Java update alternatives
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Note: in most (if not all) cases no other maintainer script actions should call update-alternatives, in particular neither of upgrade nor disappear, as any other such action can lose the manual state of an alternative, or make the alternative temporarily flip-flop, or completely switch when several of them have the same priority. update-alternatives is usually called from the following Debian package maintainer scripts, postinst (configure) to install the alternative and from prerm and postrm (remove) to remove the alternative. When each package providing a file with a particular functionality is installed, changed or removed, update-alternatives is called to update information about that file in the alternatives system. This is done so that the system administrator's changes can be confined within the /etc directory: the FHS (q.v.) gives reasons why this is a Good Thing. Instead, it is a symbolic link to a name in the alternatives directory, which in turn is a symbolic link to the actual file referenced. The generic name is not a direct symbolic link to the selected alternative. The system administrator can override this and cause it to refer to /usr/bin/ed instead, and the alternatives system will not alter this setting until explicitly requested to do so. For example, if the text editors ed(1) and nvi(1) are both installed on the system, the alternatives system will cause the generic name /usr/bin/editor to refer to /usr/bin/nvi by default. The alternatives system and the system administrator together determine which actual file is referenced by this generic name. A generic name in the filesystem is shared by all files providing interchangeable functionality. This gives choice to the users of a system, allowing each to use a different editor, if desired, but makes it difficult for a program to make a good choice for an editor to invoke if the user has not specified a particular preference.ĭebian's alternatives system aims to solve this problem.
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For example, many systems have several text editors installed at once. It is possible for several programs fulfilling the same or similar functions to be installed on a single system at the same time. Update-alternatives creates, removes, maintains and displays information about the symbolic links comprising the Debian alternatives system.
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