01-13-2009
The shell expands variables (preceded by $) before running the command "[" -- yes, that's right, "[" is a command! If the variable was the empty string, the [ command sees != followed by "n" and never sees the "left hand side" of the argument. So you put it in quotes. Now if the variable is NOT empty, the command works perfectly. Your while loop guarantees the variable will contain something -- either a y or n, so the second instance of [ will always have a y or n after it.
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