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difference between "#! /bin/sh" and "#! /bin/sh"

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# 1  
Old 12-12-2010
difference between "#! /bin/sh" and "#! /bin/sh"
In shell Programming, we know it should begin with "#! /bin/sh", it means use /bin/sh to interpreter the following command in the shell script.


But today I saw "#! /bin/sh -", it saied using "-" follow "#! /bin/sh " can avoid spoofing attack.

Anyone could explain that for me?
What is spoofing attack ? And how that can avoid spoofing attack?

Tnaks in advance!
# 2  
Old 12-12-2010
This would be important if you are using setuid scripts. But you shouldn't assign setuid permissions to a script anyway.
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