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Portupgrade is a tool to upgrade installed packages via the port.
It upgrades ports without reinstalling dependent packages by directly
modifying the package info recorded in the files under /var/db/pkg.
The procedures it takes is shown as follows:
1. Build the corresponding port of the given installed package
2. Fix the dependency info of the ones which depends on the given
package
3. Save the +REQUIRED_BY list of the given package
4. Uninstall the given package forcibly if -u is specified
5. Install the new version via the port (built in <1>)
6. Restore the +REQUIRED_BY list (saved in <3>)
The usage can be shown by running it without arguments or with a -h.
Portversion, which provides better comparison algorithm and
functionality than pkg_version(1), is also included.
Author: Akinori MUSHA <knu@FreeBSD.org>
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