UNIX for Dummies Questions & Answers

I want to check whether the variable read from the console is number or character , so i used echo $option|grep [0-9] and checked the reuslt returned by grep cmd using $?

But since I use echo the value is getting printed in the screen , I want to supress the o/p. Can anyone suggest how this can be done .

I am new to unix so I dont knowif there is any function thro which we can check if the variable is number or string .... pls help me in this regard

Use the search feature. https://www.unix.com/shell-programming-and-scripting/21668-how-check-whether-string-number-not.html