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How can you Test for bad number

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# 1  
Old 12-09-2005
How can you Test for bad number
Anyone know the code to test for bad numbers?

For example in ksh...
Want the user to input an integer, but they input characters.


read number
while (number = letter)
read number //until valid number is inputted

thx for any help!! Smilie
# 2  
Old 12-09-2005
Use egrep to test...

Code:
read foo
echo "${foo}" | egrep "^[0-9]+$" >/dev/null 2>&1
if [ "$?" -eq "0" ]; then
  echo "Yay"
else
  echo "Nay"
fi

Cheers
ZB
# 3  
Old 12-09-2005
This looks like a home work problem for me. Please read the Rules before posting.
Just a hint for your problem. Perform a arithmetic operation on your input. If it succeeds then numeric else it is non numeric.
# 4  
Old 12-09-2005
Thanks Bob
works great Smilie
Last edited by gsxpower; 12-09-2005 at 12:37 AM..
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