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  1. or download this
    perl -we'open FOO, "/dev/null";$x=<FOO>; print scalar $x'
perl -we'open FOO, "/dev/null"; print <FOO>'
  2. or download this
    perl -we'open FOO, "/dev/null"; $x=<FOO>; print $x+2'
perl -we'open FOO, "/dev/null"; $x=2+<FOO>; print $x'
  3. or download this
    perl -we'open FOO, "/dev/null"; print defined <FOO>'