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## ztail
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### Instructions
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Write a program called `ztail` that has the same behaviour as the system command `tail`, but which takes at least one file as argument.
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- The only option to be handled is `-c`. This option will be used in all tests.
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- For this program the "os" package can be used.
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- For the program to pass the tests the convention for the return code of program in Unix systems should be followed (see os.Exit).
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- For more information consult the man page for `tail`.
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