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  1. or download this
    $ echo "${PATH}"
    .:/home/ikegami/bin:/usr/local/bin:/usr/bin:/bin:/usr/bin/X11:/usr/gam
    +es
    $ echo '${PATH}'
    ${PATH}
    
  2. or download this
    BEGIN { $^I = ''; }
    while (<>) {
    ...
             print
        }
    }
    
  3. or download this
    BEGIN { $^I = ''; }
    while (<>) {
    ...
             print
        }
    }