Shell Programming and Scripting

read -n 1 LETTER;

tr [A-Z] [a-z]

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

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

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

    if [ $(echo $LETTER|grep '[A-Z]') ]; then 
        lettera=`echo $LETTER|tr [A-Z] [a-z]`;
    fi;

# read -n 1 LETTER
T
# LETTER=`echo "${LETTER}" | tr '[A-Z]' '[a-z]'`
# echo "${LETTER}"
t