Download Data Munging with Perl by David Cross PDF

By David Cross

The Perl language is definitely suited to use with "data munging" initiatives: those who contain remodeling and massaging information. whereas Perl is often used for such initiatives, there was no ebook thinking about the subject of munging. This publication covers the fundamental paradigms of programming and discusses the various suggestions which are particular to Perl. It additionally examines ordinary facts codecs equivalent to textual content, binary, HTML, and XML sooner than giving tips about growing and parsing new established information codecs. resource code downloads and technical aid from the authors can be found on publisher's website.

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To access the system log from Perl, use the Sys::Syslog module. This module contains four functions called openlog, closelog, setlogmask, and syslog which closely mirror the functionality of the UNIX functions with the same names. For more details on these functions, see the Sys::Syslog module’s documentation and your UNIX manual. pl', 'cons', 'user'); # then later in the program syslog('info', 'Process started'); # then later again closelog(); Notice that as the system logger automatically timestamps all messages, we don’t need to print the start time in our log message.

5 Final data structure More examples: using our flexible data structure Based on this data structure, we can then write any number of data munging routines to produce specific output reports. For example, to produce our original list of the CDs released in a year we would write a routine like this: sub count_cds_by_year { my %years; foreach (@CDs) { $years{$_->{year}}++; } return \%years; } This routine returns a reference to a hash which is identical in structure to our original hash and can therefore be printed out using code identical to the output section of our original script.

7 17 someone else has previously solved your particular problem then you will find a solution there. If you are the first person to address a particular problem, once you’ve solved it, why not submit the solution to the CPAN. That way everyone benefits. Perl is fun—I know this is a very subjective opinion, but the fact remains that I have seen jaded C programmers become fired up with enthusiasm for their jobs once they’ve been introduced to Perl. I’m not going to try to explain it, I’m just going to suggest that you give it a try.

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