Getting variable length in Bourne Shell

I am writing a bourne shell application which accepts input from a user.  The value that is entered MUST be a three digit number.  What is the best (easiest) way to validate this variable ?
resedlarAsked:
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jhanceCommented:
Assuming your variable is $USERINPUT:

$LENGTH=`echo $USERINPUT | wc -m`


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sethuCommented:
Thank You ! Thank You ! Thank You !

Both jhance's and sethu's solutions work the only difference is that using the "wc -m" gives the length of the string + 1, but for the application I am writing that only means that the returned value should equal 4 instead of 3.


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