Sams Teach Yourself CGI in 24 Hours, Second Edition

The quiz questions are designed to strengthen the knowledge you gain each hour.

1:	Why must you not pass unprotected user input to a shell command?
2:	What is the difference between the `cgiFormSelectSingle()` and `cgiFormRadio()` functions in `cgic`?
3:	Why is it important to make sure that you allocate enough space for strings in CGI programs written in C?

A1:	Users can send shell commands to your scripts through form fields. If you pass those commands to the shell, they can cause security problems.
A2:	There is no difference between the two functions.
A3:	If you try to store a string in a variable that is not large enough to hold it, a buffer overflow occurs.

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Sams Teach Yourself CGI in 24 Hours, Second Edition by Rafe Colburn