G'day semipro,
Welcome to the monastery.
Please add <code>...</code> tags around your posted code:
it's very hard to read as is.
You problem is probably this line:
my $S="C:Users\name\Desktop\a.txt";
Characters prefixed with a backslash inside double-quotes have a special meaning. See perlop: Quote and Quote-like Operators and perlop: Quote-Like Operators.
You can fix this by either doubling up the backslashes:
my $S="C:Users\\name\\Desktop\\a.txt";
or simply using single-quotes instead:
my $S='C:Users\name\Desktop\a.txt';
I don't use MSWin much, but I think you have an additional problem with C:Users:
should that be C:\Users?
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