check length

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# 1  
check length

I'm not familiar with unix.

I need know how to check parameter (length) when i need check the userid. lets say my charaters is 3, how to check I must key-in 3 word before system can continue to another step

echo "\n\n\n\tPlease Enter User ID: \c"
read userid
if [ "$userid" = "" ]
echo "\n\n\n\t\tUser Id Must Be Entered"
sleep 1
# 2  
length=`expr "$userid" : ".*"`
if [ "$length" -lt 3 ]
   echo "Error!"

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