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  1. or download this
    $ perl -le'qx{date abc}; print $?'
date: invalid date `abc'
256
  2. or download this
    $ perl -le'qx{cat some file}; print $?'
cat: some: No such file or directory
...

$ perl -le'qx{cat "some file"}; print $?'
0
  3. or download this
    $ perl -le'qx{echo foo | grep bar}; print $?'
256

$ perl -le'qx{echo foo | grep foo}; print $?'
0