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

echo "hello world!"


##</code><code>##

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



##</code><code>##

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


##</code><code>##

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