Provided by: inn2_2.6.0-2_amd64 bug


       prunehistory - Remove tokens from Usenet history file


       prunehistory [-p] [-f filename]


       prunehistory modifies a history(5)-format text file to "remove" a set of tokens from it.
       The tokens are removed by overwriting them with spaces, so that the size and position of
       any following entries does not change.  This has an effect similar to expiring the
       article, in that it is still mentioned in the history database but cannot be retrieved.

       prunehistory reads the standard input.  The input is taken as a set of lines.  Blank lines
       and lines starting with a number sign ("#") are ignored.  All other lines should consist
       of a message-ID followed by zero or more other fields (which are ignored).  The message-ID
       is used as the dbz(3) key to get an offset into the text file.  Since innd only appends to
       the text file, prunehistory does not need to have any interaction with it.


       -p  prunehistory will normally complain about lines that do not follow the correct format.
           If the -p flag is used, then the program will silently print any invalid lines on its
           standard output.  (Blank lines and comment lines are also passed through.)

       -f filename
           The default name of the history file is pathdb/history; to specify a different name,
           use the -f flag.


       Written by Rich $alz <> for InterNetNews.  Converted to POD by Julien

       $Id: prunehistory.pod 9447 2012-12-07 19:01:45Z eagle $


       dbz(3), history(5), innd(8).