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Linux 2.6 - man page for dpkg::version (linux section 3)

Dpkg::Version(3)			   libdpkg-perl 			 Dpkg::Version(3)

       Dpkg::Version - handling and comparing dpkg-style version numbers

       The Dpkg::Version module provides pure-Perl routines to compare dpkg-style version numbers
       (as used in Debian packages) and also an object oriented interface overriding perl
       operators to do the right thing when you compare Dpkg::Version object between them.

       my $v = Dpkg::Version->new($version, %opts)
	   Create a new Dpkg::Version object corresponding to the version indicated in the string
	   (scalar) $version. By default it will accepts any string and consider it as a valid
	   version. If you pass the option "check => 1", it will return undef if the version is
	   invalid (see version_check for details).

	   You can always call $v->is_valid() later on to verify that the version is valid.

       boolean evaluation
	   When the Dpkg::Version object is used in a boolean evaluation (for example in "if
	   ($v)" or "$v || 'default'") it returns its string representation if the version stored
	   is valid ($v->is_valid()) and undef otherwise.

	   Returns true if the version is valid, false otherwise.

       $v->epoch(), $v->version(), $v->revision()
	   Returns the corresponding part of the full version string.

       $v1 <=> $v2, $v1 < $v2, $v1 <= $v2, $v1 > $v2, $v1 >= $v2
	   Numerical comparison of various versions numbers. One of the two operands needs to be
	   a Dpkg::Version, the other one can be anything provided that its string representation
	   is a version number.

       "$v", $v->as_string()
	   Returns the string representation of the version number.

       All the functions are exported by default.

       version_compare($a, $b)
	   Returns -1 if $a is earlier than $b, 0 if they are equal and 1 if $a is later than $b.

	   If $a or $b are not valid version numbers, it dies with an error.

       version_compare_relation($a, $rel, $b)
	   Returns the result (0 or 1) of the given comparison operation. This function is
	   implemented on top of version_compare().

	   Allowed values for $rel are the exported constants REL_GT, REL_GE, REL_EQ, REL_LE,
	   REL_LT. Use version_normalize_relation() if you have an input string containing the

       my $rel = version_normalize_relation($rel_string)
	   Returns the normalized constant of the relation $rel (a value among REL_GT, REL_GE,
	   REL_EQ, REL_LE and REL_LT). Supported relations names in input are: "gt", "ge", "eq",
	   "le", "lt", ">>", ">=", "=", "<=", "<<". ">" and "<" are also supported but should not
	   be used as they are obsolete aliases of ">=" and "<=".

       version_compare_string($a, $b)
	   String comparison function used for comparing non-numerical parts of version numbers.
	   Returns -1 if $a is earlier than $b, 0 if they are equal and 1 if $a is later than $b.

	   The "~" character always sort lower than anything else. Digits sort lower than non-
	   digits. Among remaining characters alphabetic characters (A-Za-z) sort lower than the
	   other ones. Within each range, the ASCII decimal value of the character is used to
	   sort between characters.

       version_compare_part($a, $b)
	   Compare two corresponding sub-parts of a version number (either upstream version or
	   debian revision).

	   Each parameter is split by version_split_digits() and resulting items are compared
	   together.in digits and non-digits items that are compared together. As soon as a
	   difference happens, it returns -1 if $a is earlier than $b, 0 if they are equal and 1
	   if $a is later than $b.

       my @items = version_split_digits($version)
	   Splits a string in items that are each entirely composed either of digits or of non-
	   digits. For instance for "1.024~beta1+svn234" it would return ("1", ".", "024",
	   "~beta", "1", "+svn", "234").

       my ($ok, $msg) = version_check($version)
       my $ok = version_check($version)
	   Checks the validity of $version as a version number. Returns 1 in $ok if the version
	   is valid, 0 otherwise. In the latter case, $msg contains a description of the problem
	   with the $version scalar.

       Don Armstrong <don@donarmstrong.com>, Colin Watson <cjwatson@debian.org> and Raphael
       Hertzog <hertzog@debian.org>, based on the implementation in "dpkg/lib/vercmp.c" by Ian
       Jackson and others.				    2012-04-17				 Dpkg::Version(3)

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