I have to make a script that receives two parameters, of which the second must be a whole number. I have no idea how to validate that.
if test $2 =~ "^[0-9]+$"
then
echo "\nNumero positivo entero"
else
echo "\nError: El numero $2 no es un numero entero positivo!!!\a"
fi
You can use regular expressions to validate numbers, whether they are integers, negative integers or decimals, you could do something like this:
validate_number=^-?[0-9]+([.][0-9]+)?$;
echo "Please Enter your number ";
read number
if ![[ $number =~ $validate_number ]]; then
echo "number not valid"
fi
the regular expressions are:
[1.] ^ -? this expression verifies the beginning of the string and if it contains some character only one -
[2.] [0-9] verify that they are numbers from 0 to 9
[3.] the character + specifies the operator or
[4.] ([.] [0-9] +) $ confirms if the entered value was a decimal number and verifies the end of the string with $
The previous code receives a keyboard argument and verifies if the input was really a number, whether positive, negative or decimal
Can be validated with a case :
case $2 in
(""|*[^0-9]*) printf "\nError: ¡¡¡ [$2] no es un número entero positivo !!!case $2 in
(""|*[^0-9]*) printf "\nError: ¡¡¡ [$2] no es un número entero positivo !!!%pre%7\n";;
(*) printf "\nNúmero entero positivo\n";;
esac
7\n";;
(*) printf "\nNúmero entero positivo\n";;
esac
You can perform a method that receives parameters, that takes the value of the second and validates whether it is Integer or not, for example:
esEnteroSegundoParametro() {
echo "Valor parametro #1 is $1"
echo "Valor parametro #2 is $2"
#Revisa si el segundo parámetro es un entero.
if echo "$2" | egrep -q '^\-?[0-9]+$'; then
echo "$2 es un entero."
else
echo "$2 NO es un entero."
fi
}
If we execute the method with the following values:
esEnteroSegundoParametro 14 12.2
we get:
If we execute the method with the following values:
esEnteroSegundoParametro 14 12
we get:
What you can do is filter it by error control seeing that if it is a digit and if it is greater than 0 it is a whole number but, no, not.
echo -en $caracter | grep '[[:digit:]]' > /dev/null 2> /dev/null
if [ $? -eq 0 && $caracter -gl 0 ]
then
echo "Es un digito entero"
# Si no, mostrem un missatge indicant que no és ni lletra ni nombre
else
echo "No es un digito entero"
fi