Beefy Boxes and Bandwidth Generously Provided by pair Networks
"be consistent"

Comment on

( #3333=superdoc: print w/replies, xml ) Need Help??

Adding my personal “toady” to this, I view such problems in an awk-like sort of way.   There are two “kinds of” lines here:   “those that look like [servername],” and, in the simplest case, “those that don’t.”  There is one thing to be done in each case.

The data-structure of choice is a hashref, whose elements are arrayrefs containing the file-names.   Perl’s “auto-vivification” feature does, as intended, most of the work, viz:

(extemporaneous coding follows ... your syntax may vary ... stripped to the bare parts for clarity)

my $server_name; my $results; while (my $line = <$file>) { if ($line =~ /\[(.*)\]/) { $server_name = $1; } elsif ($line =~ /(\/.*)/) { die "file doesn't begin with servername line!" unless defined($server_name); push @{ $results->{$server_name} }, $1; } } foreach my $k (keys $results) { print "$k: " . join(" ", @{ $results->{$k} } ) . "\n"; }

Notice how, in the push statement, we simply rely upon Perl to create a new hash-bucket, if one does not yet exist, and to treat the whole thing as an arrayref upon which we can push things.   This is the “auto-vivification” of which I was speaking.   Notice that the program will die if it detects (and that it does look for ...) that the first line in the file is not a server-name record.   The other bits of writing things on multiple source-lines and so forth are just my personal style.

In reply to Re: File Manipulation by sundialsvc4
in thread File Manipulation by Mark.Allan

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, 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, 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.
  • Log In?

    What's my password?
    Create A New User
    and all is quiet...

    How do I use this? | Other CB clients
    Other Users?
    Others about the Monastery: (5)
    As of 2018-01-22 09:01 GMT
    Find Nodes?
      Voting Booth?
      How did you see in the new year?

      Results (233 votes). Check out past polls.