open (RD, "ls -l /dir1/dir2/dir3/'$b' |");
...
foreach $fileline (@user_dir)
{
@filenames = split(/\s+/,$fileline, 9);
Consider using opendir and readdir (or even File::Find) there, instead of reading from ls -l. If all else fails, consider using ls -1 at least so you only get a single filename per row, instead of having to parse and split things.
The following could give you a start:
my $dir = "/dir1/dir2/dir3/$b";
opendir my $dh,
or die "Couldn't read directory '$dir'";
my @user_dir = map { "$dir/$_" }
grep { $_ !~ /^\.\.?$/ } readdir $dh;
...
foreach my $fileline (@user_dir) {
my $filename = $fileline;
...
}
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