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  1. or download this
    $ perl -le'print $ARGV[0]' 'Hello, World!'
Hello, World!
  2. or download this
    $ FOO='Hello, World!'

$ perl -le'print $ARGV[0]' "$FOO"
Hello, World!
  3. or download this
    $ FOO='Hello, World!'

...

$ perl -le'print $ENV{FOO}'
Hello, World!
  4. or download this
    $ export FOO='Hello, World!'

$ perl -le'print $ENV{FOO}'
Hello, World!
  5. or download this
    $ FOO='Hello, World!' perl -le'print $ENV{FOO}'
Hello, World!