I am not sure it would work as advertised, but I woudl try something like 
bash -i -c '(HERE GOES THE ORIGINAL CODE OF a.sh) & echo $!'

[download]
Update: The echo would probably mess with the backticks. I should not link to a material I am not so familiar with :-)

In reply to Re^6: parent process stuck in read(2) on pipe opened to child process using backtick by choroba
in thread parent process stuck in read(2) on pipe opened to child process using backtick by Anonymous Monk

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