[Solved] check if chars is a capital letter and translate it

Shell Programming and Scripting
1

how can i check if

read -n 1 LETTER;

LETTER is a capital letter and after translate in minuscule.
i have thought with:

tr [A-Z] [a-z]

or no?

2 
if [ $(echo $LETTER|grep '[A-Z]') ];then echo CAPITAL;else echo NOT;fi
3

I can't see anything wrong with what you posted:

echo "TeSt" | tr '[A-Z]' '[a-z]'
test

Why you need to check then translate?

4

yes but i must put the letter translate into $LETTER

5 
 $ LETTER=A; B=$(echo $LETTER| tr '[A-Z]' '[a-z]');echo $B
a
6

i solved with this code:

    if [ $(echo $LETTER|grep '[A-Z]') ]; then 
        lettera=`echo $LETTER|tr [A-Z] [a-z]`;
    fi;
7 
# read -n 1 LETTER
T
# LETTER=`echo "${LETTER}" | tr '[A-Z]' '[a-z]'`
# echo "${LETTER}"
t
8

in ksh:

# LETTER=A
# typeset -l LETTER
# echo $LETTER
a