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shebang

Q. I know #!/bin/bash is shebang line. But, I noticed a few shell script shebang line ends with a single dash ( #!/bin/bash - ) or double dash ( #!/bin/bash -- ). Can you explains me purpose of such shebang line?
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How To Write First UNIX Korn Shell Script Program

Can you tell me how to write a UNIX korn shell script program? I'm new to UNIX scripting and HP-UX UNIX operating system.
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