Answer Posted / tony

It's a forced attempt to try and let the script run with the Shell it was designed for. If the Shell is missing from a given system (which is unlikely if the Shell is a popular one), the script would fail. But, if the Shell is not a popular one, it will fail for a good reason, because the unpopular Shell has a high chance of not being compatible. Also, it's a method of indicating the system on which the script was written and intended for, just as a remark to any reader.

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1123

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c program to display the information of given file similar to givan by the unix or linux command ls -l

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