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Linux 2.6 - man page for relup (linux section 5)

relup(5)				      Files					 relup(5)

       relup - Release upgrade file

       The release upgrade file describes how a release is upgraded in a running system.

       This file is automatically generated by systools:make_relup/3,4 , using a release resource
       file ( .rel ), application resource files ( .app ) and application upgrade files (  .appup
       ) as input.

       In  a  target  system,  the  release  upgrade file should be located in the OTP_ROOT/erts-
       EVsn/Vsn directory.

       The relup file contains one single Erlang term, which defines  the  instructions  used  to
       upgrade the release. The file has the following syntax:

	 [{UpFromVsn, Descr, Instructions}, ...],
	 [{DownToVsn, Descr, Instructions}, ...]}.

	 * Vsn = string() is the current version of the release.

	 * UpFromVsn = string() is an earlier version of the release to upgrade from.

	 * Descr  =  term()  is  a user defined parameter passed from the systools:make_relup/3,4
	   function. It will be used in the return value of release_handler:install_release/1,2 .

	 * Instructions is a list of low-level release upgrade instructions, see appup(5) .

	   It consists of the  release	upgrade  instructions  from  the  respective  application
	   upgrade  files  (high-level instructions are translated to low-level instructions), in
	   the same order as in the start script.

	 * DownToVsn = string() is an earlier version of the release to downgrade to.

       When upgrading from UpFromVsn with release_handler:install_release/1,2 ,  there	does  not
       have  to  be  an exact match of versions, but UpFromVsn can be a sub-string of the current
       release version.

       app(5), appup(5), rel(5), release_handler(3erl), systools(3erl)

Ericsson AB				   sasl 				 relup(5)

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