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input from command line in bash


I know this is easy, but I can never remember how to do it and I can't 
find it in the bash
man page. (I'm sure its in there...) How do you set the value of a shell 
from the command line? Basically I want to write a shell script which askes,
"Are you sure you want to proceed? [N/y] " and then acts according to user
input at the command line.

Thanks. Steve.

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