With regard to BerkelyDB => RTFM. You can't just make syntax up and expect it to work. This works fine..... 

[root@www mail]# cat reader.pl
#!/usr/bin/perl
use BerkeleyDB;
tie %hash, 'BerkeleyDB::Hash', -Filename => $ARGV[0]
    or die "can't read file '$ARGV[0]': $!";
print map { "  $_ => $hash{$_}\n" } sort keys %hash;

[root@www mail]# ./reader.pl virtusertable.db
  @blech.com.au => blech.com.au
  [snip]

[download]

With regard to your second example, once again you need to RTFM. You have a syntax error in that DB_HASH is a $PERL_SCALAR not a constant as you assume. I would agree with your C style brain that it should logically be a constant but I did not design the interface..... 

tie %hash, 'DB_File', $file, O_RDONLY, 0666, $DB_HASH

[download]

cheers

tachyon

In reply to Re^3: Reading Sendmail .db files by tachyon
in thread Reading Sendmail .db files by Maddingue

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.