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i get stuck with this shell script code

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Homework and Emergencies Homework & Coursework Questions i get stuck with this shell script code
# 1  
Old 08-24-2009
i get stuck with this shell script code
i get stuck here . Anyone could check my work?
the user type a group of upper case letters at a time with 0 at the end. Find and display the first letter in alphabetic order.
For example, input of F, G, K, S, U, G, D, Q, P , the result should be D
Any invalid input character (eg. #, $, 3, a, etc.) should cause an error message and be ignored.

echo "please enter an alphabet"
input3=1
echo "" > temp
while [ "$input3" != "0" ]; do
read input3
echo $input3 > check
if [ "$input3" != "0" ]; then
if [ check1=`grep -w "[A-Z]" check ]; then
echo $input3 >> temp
else
echo input should be upper case alphabet
fi
fi
done
grep -w "[A-Z]" temp > temp1
echo the first letter in alphabetic order is `sort temp1 | head -1`;;
# 2  
Old 08-24-2009
To keep the forums high quality for all users, please take the time to format your posts correctly.

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Thank You.

The UNIX and Linux Forums

---------- Post updated at 10:51 AM ---------- Previous update was at 09:11 AM ----------

Code:
#!/usr/bin/ksh

TMP="bla"

# Clean up old temp file
clean_up()
{
        if [[ -e $TMP ]]; then
                rm $TMP
        fi
}

clean_up

echo "Enter one upper case character per line and hit enter; to stop enter a zero."

while :; do
        read INPUT
        case $INPUT in
                [A-Z])          echo $INPUT >> $TMP
                                ;;
                0)              echo '------ OUTPUT ------'
                                sort $TMP| uniq| head -1
                                break
                                ;;
                *)              echo "no upper case letter and/or more than 1 character!"
                                ;;
        esac
done

clean_up

exit 0

# 3  
Old 08-25-2009
thanks for your help....love you so much!!keke

---------- Post updated 08-25-09 at 02:21 AM ---------- Previous update was 08-24-09 at 09:36 AM ----------

hi Zaxxon!
your code still work with lower case characters , can you check it again!?
# 4  
Old 08-25-2009
Works on my box:

Code:
Enter one upper case character per line and hit enter; to stop enter a zero.
3
no upper case letter and/or more than 1 character!
d
no upper case letter and/or more than 1 character!
F
s
no upper case letter and/or more than 1 character!
S
h
no upper case letter and/or more than 1 character!
$
no upper case letter and/or more than 1 character!
p
no upper case letter and/or more than 1 character!
P
0
------ OUTPUT ------
F

I guess you did not use ksh - I have the same problem like you on bash. Not sure why though. When using ksh like in the shebang (#!/usr/bin/ksh) all is fine. Maybe someone else knows why, sorry.



Update:
Found a way in bash - change the line inside the case/esac to:
Code:
                [A-Z])          echo $INPUT >> $TMP
# to
                [[:upper:]])          echo $INPUT >> $TMP

Last edited by zaxxon; 08-25-2009 at 04:42 AM.. Reason: update
# 5  
Old 08-25-2009
yeah! now i undertand my problem! thanks for your help.
# 6  
Old 08-25-2009
HOMEWORK CANNOT BE POSTED WITHOUT USING THE HOMEWORK TEMPLATE

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Please review the rules, which you agreed to when you registered, if you have not already done so.

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