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$ cat hello.sh
#!/usr/bin/bash

echo "hello world!"

$ perl -e '$command = "./hello.sh"; $out = `$command`; print $out, "\n
+";'

$ perl -e '$command = "./hello.sh"; $out = `bash $command`; print $out
+, "\n";'
hello world!

$ perl -e '$command = "bash ./hello.sh"; $out = `$command`; print $out
+, "\n";'
hello world!