Is it possible to pass a subroutine a string with a variable in it, and act on that string within the subroutine and update the embedded variable?

For example, pass to a subroutine file with a list of symbols and a URL with a variable for the undefined symbol embedded in it, like the following.

When I run the following code, it tries to execute and download the file as expected, but $symbol info in the file directory and in URL are undefined. 

 
my $testfile="/home/user/symbol_list";
my $wget_url="/home/user/sym_dir/${symbol}_2013 'http://www.downloadsi
+te.com/${symbol}.dat'";

&get_symbol_data($testfile,$wget_url);

sub get_symbol_data {
 open (FILE, $_[0]) || die "Can't open $_[0] $!\n";
 @sym_array = <FILE>;
 close <FILE>;

 foreach $symbol (@sym_array) {
   chomp $symbol;
   `usr/bin/wget -O $_[1]`;
 } 
}

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In reply to Subroutine and variable passing by tman77

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