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The "use" command is the way to request additional features in perl.
For example, the statement
use Date::Parse;
will include the Date/Parse.pm module which provides two functions to parse date strings.
There are thousands of modules available and you may easily write your own modules for code that you use in several programs.
This answer naturally leads on to follow-on questions:
How do I know which features have been added by a particular "use" statement?
For standard modules (such as Date::Parse) that are usually installed on your computer, try the command
perldoc Date::Parse
on the command line. This should give you the documentation of the installed module. If this fails, go on to the next question.
For non-standard modules, you have to find the file Date/Parse.pm and look into it for documentation (this is not always informative).
Which modules are available for free?
Many Perl modules are distributed as free software. Go to http://www.cpan.org/ or http://search.cpan.org/ and browse/search the CPAN (Comprehensive Perl Archive Network).
Most likely you will initially be overwhelmed by the pure number of available modules --- but in most cases you will find that somebody has already posted some code for features that you need.
Documentation is included The "use" command is the way to request additional features in perl.
For example, the statement
use Date::Parse;
will include the Date/Parse.pm module which provides two functions to parse date strings.
There are thousands of modules available and you may easily write your own modules for code that you use in several programs.
This answer naturally leads on to follow-on questions:
How do I know which features have been added by a particular "use" statement?
For standard modules (such as Date::Parse) that are usually installed on your computer, try the command
perldoc Date::Parse
on the command line. This should give you the documentation of the installed module. If this fails, go on to the next question.
For non-standard modules, you have to find the file Date/Parse.pm and look into it for documentation (this is not always informative).
Which modules are available for free?
Many Perl modules are distributed as free software. Go to http://www.cpan.org/ or http://search.cpan.org/ and browse/search the CPAN (Comprehensive Perl Archive Network).
Most likely you will initially be overwhelmed by the pure number of available modules --- but in most cases you will find that somebody has already posted some code for features that you need.
Documentation is included
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