Homework & Coursework Questions

i have a bank project in shell script.it has a module called deposit.when i am entering an amount and commit a mistake like entering char instead of numbers and so on and repeating it, suppose 3 times,then it is rejected by amount validation code. every thing is fine upto these steps. but after 3 times if i give the correct amount then this new amount is added three times to the account rather than just once.
i dont know why
please help..


first getting old value of amount by grep command
and then adding new amount to it


i am replacing the old amount with new one using "sed" command
sed s/old/new details > file
mv file details

what to do?

wilshire soft
hyderabad
india

break the loop when correct? Show us the loop, or are the three tries in a line? Use a loop.

thanx for the quick reply
may be you are right ? i will check it

Before making the old -> new, put a conditional check for the input with a counter.

1. use something like below for the validation
echo "asbc123" | tr -dc '[:alpha:]' #if something return its invalid

2. for each try increament the counter
check if the step1 not returning anything & step2<=3
proceed
else
do nothing

this is very funny situation
i tried the code on my laptop at home and its working fine
i dont know what goes wrong on the server with the code in office

tomorrow i will check it again in the office
for the while i have this code
################################
in deposit module
############
amtvalidation ()

{
len=`echo "$amt"|wc -c`
for((i=1;i<len;i++))
do
c=`echo "$amt"|cut -c$i`
case $c in
[0-9])continue;;
*)echo "invalid .enter:"
read amt
amtvalidation "$amt";;
esac
done
let r=amt%100
if [ $r -ne 0 ]
then
echo "enter amount in 100: "
read amt
amtvalidation "$amt"
fi
}

clear

echo "enter accno:"
read accno

echo "enter the amount:"
read amt
amtvalidation "$amt"

old=`grep -w "$accno" info|cut -d ":" -f7`

clear
sleep 1
echo "pre amt is $old "
let new=old+amt
sed "/$accno/s/$old/$new/" info > file
mv file info


echo
sleep 1
echo "added"
echo


n=`grep -w "$accno" info|cut -d ":" -f7`
sleep 1
echo "new amt is $n:"
echo


######################
in info file the red number is f7(field 7)
################
dha:jhjh:hgj@jhj.com:dha:8989898989:hjj:3800:123021

Do you have a

Code:

#!/path/to/interpreter [one-option-like-f-in-sed-or-awk ]

line at the top of the script and made it executable to the executing id?

Are the interpreters the same version?

hiiiiii friend
i am very much new to shell script
i dont know that much of technicalities
please mention what should be added at top of script

---------- Post updated at 10:11 PM ---------- Previous update was at 10:09 PM ----------

the code i have pasted is working fine on my laptop but the same code gets wrong on my office server