use Config::IniFiles;
#  my $cfg = new Config::IniFiles( -file => "configfile.ini" );
# or
my %ini
tie %ini, 'Config::IniFiles', ( -file => "configfile.ini" );

# do stuff with %ini

# create a new section and add values
$ini{new_section} = {};
$ini{new_section}{new_param1} = $val;
$ini{new_section}{new_param2} = $val2;

# add a multiline value
$ini{new_section}{new_param2} = [$value1, $value2, ...];

# save with the TIED hash 
# overwrite the current ini file
tied( %ini )->RewriteConfig();
# or you can write to a different file
#tied( %ini )->WriteConfig ($NewFilename);

# save with object ref
# overwrite the current ini file
#$cfg->RewriteConfig();
# or you can write to a different file
#$cfg->WriteConfig ($NewFilename);