Hi I need help regarding substituion of varaibles with values

Say I have a txt file (a.txt)

which has only one line:
Hi $name

The PL file
========
open INPUT, "a.txt";
my $name="Anish";
my $temp="";
while (<INPUT>)
{
  $temp=$temp.$_;
}
close(INPUT);
print "Content is: $temp";

In the output I want the $name to get as Anish..O/P like Hi Anish




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