Shell Programming and Scripting

ex: 
abc_data_20071102.csv, 
abc_data_20091221.csv, 
abc_data_20100110.csv, 
abc_data_20100222.csv, 
abc_data_20080620.csv,... etc.,

ex: files starting from the date 20090101 to 20101231

my @files = </test/ganap/abc_*.csv>;
foreach my $inputfilename (@files) {
   open( my $in_fh, "<", $inputfilename ) or die "Can't open $inputfilename : $!";
#.......................... file processing
}
close($in_fh);

my @files = < /test/ganap/abc_20[01][09][0112].csv >;
foreach my $inputfilename (@files) {
   open( my $in_fh, "<", $inputfilename ) or die "Can't open $inputfilename : $!";
#.......................... file processing
}
close($in_fh);

my $startdate  = $ARGV[0];
my $enddate  = $ARGV[1];

my @files = </test/ganap/abc_*.csv>; #current approach, which is wrong.
foreach my $inputfilename (@files) {
   open( my $in_fh, "<", $inputfilename ) or die "Can't open $inputfilename : $!";
#.......................... file processing
}
close($in_fh);