How to identify numeric Input
 

Hi guys when i execute my script it says integer expression expected .How would i handle this in my script please suggest.


Please Enter Your Age sa
./ifexercise.sh: line 7: [: sa: integer expression expected
./ifexercise.sh: line 10: [: sa: integer expression expected
Please enter proper Input

Content of my script.
#!/bin/bash
echo "Please Enter Your Age"
read age
retirement_age=65
if [ -z "$age" ]
then
echo "dont enter empty string"
elif [ "$age" -gt $retirement_age ]
then
echo "You Should retire now"
elif [ "$age" -le $retirement_age ]
then
echo "You are young"
else
echo "Please enter proper Input"
fi

See http://www.linuxquestions.org/questi...n-bash-279227/
(you didn't look very hard for the solution, didn't you?)

I have Modified my script As follows:




#!/bin/bash
echo "Please Enter Your Age"
read age
retirement_age=65
if [ -z "$age" ]
then
echo "dont enter empty string"
elif [ ! `expr $age + 1 2>/dev/null` ]
then
echo "Please Enter Numeric Number"
elif [ "$age" -gt $retirement_age ]
then
echo "You Should retire now"
elif [ "$age" -le $retirement_age ]
then
echo "You are young"
else
echo "Please enter proper Input"
fi

How do i find the questions that are already posted as there are so many questions in here?

Use the top bar
click on Search, then in first option, click 'Advanced Search'