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  1. or download this
    $ perl -e 'system(@ARGV); readline' echo foo
foo
Can't open echo: No such file or directory at -e line 1.
Can't open foo: No such file or directory at -e line 1.
  2. or download this
                                     # vvvvv
$ perl -e 'system(@ARGV); readline STDIN' echo foo
foo
    (<=== waited here for me to press Enter)