Shell Script to Validate Integer Input Last Updated : 09 Apr, 2021 Comments Improve Suggest changes Like Article Like Report Here we are going to see a shell script which validates an integer. We are going to display whether the input entered is an integer or an invalid input. Approach: Take input from the user.Store the input of any variableNow we are going to trim the input in such a way that all the -(minus) or +(plus) signs before the input are trimmed down.Now we are going to apply a regular expression to check if the input pattern has multiple occurrences of digits 0-9.If the input pattern contains only digits, this means that the input entered is a valid integer and in all other cases, invalid integer input is shown. The Shell Script is given below: # Asking the user to enter an input echo "Enter an input" # reading and storing input read variable # Applying the approach given above case ${variable#[-+]} in *[!0-9]* | '') echo "Not an integer" ;; * ) echo "Valid integer number" ;; esac Output: Output of the above code snippet Comment More infoAdvertise with us Next Article Shell Script to Validate Integer Input C chinmay_bhide Follow Improve Article Tags : Linux-Unix Shell Script Similar Reads Shell Script To Check For a Valid Floating-Point Value User Input can be hectic to manage especially if it's about numbers. Let's say you wanted to perform mathematical calculations in your app or script. It's not hard to say that it will have to deal with floating-point numbers. It's easy in many statically typed programming languages but if it has to 4 min read Shell Script Program to Demonstrate the '$#' Variable In Linux, if we want to count the total number of arguments that are passed to the specific script then we can use the "$#" variable. This variable stores the total count of arguments, the program properly tracks and reports the number of arguments passed at the runtime of the script. Along with thi 5 min read Shell Script to validate the date, taking into account leap year rules Prerequisites: Bash Scripting, Shell Function Library We will build a bash script to check whether the entered date is valid or not according to the Gregorian Calendar rules. If the date is invalid, the script will tell the reason for its invalidity. The script takes three arguments - day, month, an 5 min read How to Validate Decimal Numbers in JavaScript ? Validating user input is an essential aspect of Web Development. As a developer, when we are playing with the numeric inputs provided by the end-user, it is quite important to ensure that the input provided by the user is in the correct format. We can use the regular expression to Validate Decimal N 2 min read Shell script to print table of a given number In this article, we will explore the process of creating a simple yet powerful shell script that takes user input and generates number tables. Number tables are a common mathematical concept used to display the multiples of a given number up to a specified limit. We will illustrate this process with 2 min read How to Validate Number String in JavaScript ? Validating a number string in JavaScript involves ensuring that a given string represents a valid number. This typically includes checking for digits, optional signs (+/-), decimal points, and possibly exponent notation (e.g., "1.23e4"). We will use various methods to validate number strings in Java 2 min read Struts 2 Int Validation Struts 2 integer validator is used to determine whether an integer field is inside a certain range. There are two ways to use this validator, much as other Struts validators. The Field Validator verifies if the entered number falls into the defined range. Example of Struts 2 int validationXML <va 3 min read How to prompt for Yes/No/Cancel input in a Linux shell script You may have noticed that shell programs occasionally ask the user for confirmation by prompting [Y/n] or [Yes/No]. Knowing whether a user wishes to continue with the following stages or not is useful. A similar feature can be added to your script as well. This article will assist you with examples 3 min read Shell Script to print odd and even numbers In this article, we will discuss how to print even and odd numbers. We will take a number as input and print all even and odd numbers from 1 to the number. Input : Enter the Number - 10 Output : Even Numbers - 2, 4, 6, 8, 10 & Odd Numbers - 1, 3, 5, 7, 9 Input : Enter the Number - 5 Output : Eve 2 min read Bash shell script to find sum of digits Given a number Num, find the sum of digits of the number.Examples: Input : 444 Output : sum of digits of 444 is : 12 Input : 34 Output : sum of digits of 34 is : 7 Approach: 1. Divide the number into single digits 2. Find the sum of digits . Bash # !/bin/bash # Program to find sum # of digits # Stat 1 min read Like