Re: Removing white space from the file

[Monk::Thomas]

$fh =~ s/\s//g;

You can not apply a substitution to a file handle. (Well you can, but it does not modify the actual file content.)

Another problem is:

open(my $fh, ">> uuu.txt")

...which would open the file for appending, but NOT for reading.

You did not specify whether you want an in-place edit of the file or whether you just want to convert the content for further processing. (For an in-place edit I would actually prefer to use something like 'sed -i~ s/[0-9 ]//g uuu.txt' instead of perl, because I get a backup copy of the original file for free.)