compver(4)                       DG/UX R4.11                      compver(4)


NAME
       compver - compatible versions file

DESCRIPTION
       compver is an ASCII file used to specify previous versions of the
       associated package which are upward compatible.  It is created by a
       package developer.

       Each line of the file specifies a previous version of the associated
       package with which the current version is backward compatible.

       Since some packages may require installation of a specific version of
       another software package, compatibility information is extremely
       crucial.  Consider, for example, a package called "A" which requires
       version "1.0" of application "B" as a prerequisite for installation.
       If the customer installing "A" has a newer version of "B" (version
       1.3), the compver file for "B" must indicate that "1.3" is compatible
       with version "1.0" in order for the customer to install package "A".


NOTES
       The comparison of the version string disregards white space and tabs.
       It is performed on a word-by-word basis.  Thus "Version         1.3"
       and "Version 1.3" would be considered the same.

EXAMPLE
       A sample compver file is shown below.

       Version 1.3
       Version 1.0

SEE ALSO
       pkginfo(4).


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