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  1. or download this
    $var  = `ls`;
print "\n---\n $var \n---\n ";
The $var will have the output of 'ls' command.
  2. or download this
    $var = system('ls');
print "\n---\n $var \n---\n ";
  3. or download this
    $var = exec('ls');
print "\n---\n $var \n---\n ";