123
Appendix F
Alternative versions of an interface  
update alternatives
(from old
Packaging Manual)
When several packages all provide different versions of the same program or file it is useful to
have the system select a default, but to allow the system administrator to change it and have
their decisions respected.
For example, there are several versions of the
vi
editor, and there is no reason to prevent all
of them from being installed at once, each under their own name (
nvi
,
vim
or whatever).
Nevertheless it is desirable to have the name
vi
refer to something, at least by default.
If all the packages involved cooperate, this can be done with
update alternatives
.
Each
package
provides
its
own
version
under
its
own
name,
and
calls
update alternatives
in its postinst to register its version (and again in its prerm to
deregister it).
See the man page
update alternatives(8)
for details.
If
update alternatives
does not seem appropriate you may wish to consider using diver 
sions instead.






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