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  1. or download this
    $ cat hello.sh
#!/usr/bin/bash

echo "hello world!"
  2. or download this
    $ perl -e '$command = "./hello.sh"; $out = `$command`; print $out, "\n
+";'
  3. or download this
    $ perl -e '$command = "./hello.sh"; $out = `bash $command`; print $out
+, "\n";'
hello world!
  4. or download this
    $ perl -e '$command = "bash ./hello.sh"; $out = `$command`; print $out
+, "\n";'
hello world!