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  1. or download this
    $ perl -e '$result = `foobar`'
  2. or download this
    $ perl -Mstrict -Mwarnings -e '$result = `foobar`'
Global symbol "$result" requires explicit package name at -e line 1.
Execution of -e aborted due to compilation errors.
  3. or download this
    $ perl -Mstrict -Mwarnings -e 'my $result = `foobar`'
Can't exec "foobar": No such file or directory at -e line 1.
  4. or download this
    $ perl -Mstrict -Mwarnings -e 'my $result = `ls`'