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checking wether an input is using letters of the alphabet

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# 1  
Old 07-27-2009
checking wether an input is using letters of the alphabet

afternoon forums.

I need to get a way of testing as to wether an inputed character is part of the english alphabet.

i have come up with the following code but its not working at all.
until [ (echo $in1) = '[a-z]']
       echo This is not a Letter

any help would be beneficial to me.
# 2  
Old 07-27-2009

while read LINE
        case "$LINE" in
        [A-Za-z]) echo "alpha";;
        *) echo "not alpha";;


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