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 Looping Statements | Shell Script Looping Statements in Shell Scripting: There are total 3 looping statements that can be used in bash programming Table of Content `while` statement in Shell Script in Linux`for` statement in Shell Script in Linux`until` statement in Shell Script in LinuxExamples of Looping StatementsTo alter the fl 10 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 Conditional Statements | Shell Script Conditional Statements: There are total 5 conditional statements which can be used in bash programming if statement if-else statement if..elif..else..fi statement (Else If ladder) if..then..else..if..then..fi..fi..(Nested if) switch statement Their description with syntax is as follows: if statement 3 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 How To Validate Input Field In The HTML Form? Input fields are essential components of HTML forms, enabling users to provide data for processing. Ensuring proper validation of these input fields enhances user experience and prevents errors or malicious inputs. What We Are Going to Create?We will create simple Validating Input Fields in HTML For 3 min read how to use validate_comma_separated_integer_list in django A validator is a callable that takes a value and raises a ValidationError if it doesn’t meet the criteria. Validators can be useful for re-using validation logic between different types of fields. In this article, we will learn how to use 'validate_comma_separated_integer_list' validator in Django. 4 min read Like