Shell Scripting - Here Strings

String Operators | Shell Script

Last Updated : 08 Sep, 2022

Pre-Requisite: Conditional Statement in Shell Script There are many operators in Shell Script some of them are discussed based on string.

Equal operator (=): This operator is used to check whether two strings are equal. Syntax:

Operands1 = Operand2

Example:

php

#!/bin/sh

str1="GeeksforGeeks";
str2="geeks";
if [ $str1 = $str2 ]
then
    echo "Both string are same";
else
    echo "Both string are not same";
fi

Output:

Both string are not same

Not Equal operator (!=): This operator is used when both operands are not equal. Syntax:

Operands1 != Operands2

Example:

php

#!/bin/sh

str1="GeeksforGeeks";
str2="geeks";
if [ $str1 != $str2 ]
then
    echo "Both string are not same";
else
    echo "Both string are same";
fi

Output:

Both string are not same

Less than (\<): It is a conditional operator and used to check operand1 is less than operand2. Syntax: Operand1 \< Operand2 Example:

php

#!/bin/sh

str1="GeeksforGeeks";
str2="Geeks";
if [ $str1 \< $str2 ]
then
    echo "$str1 is less than $str2";
else
    echo "$str1 is not less than $str2";
fi

Output:

GeeksforGeeks is not less than Geeks

Greater than (\>): This operator is used to check the operand1 is greater than operand2. Syntax: Operand1 \> Operand2 Example:

php

#!/bin/sh

str1="GeeksforGeeks";
str2="Geeks";
if [ $str1 \> $str2 ]
then
    echo "$str1 is greater than $str2";
else
    echo "$str1 is less than $str2";
fi

Output:

GeeksforGeeks is greater than Geeks

Check string length greater than 0: This operator is used to check the string is not empty. Syntax:

[ -n Operand ]

Example:

php

#!/bin/sh

str="GeeksforGeeks";
if [ -n $str ]
then
    echo "String is not empty";
else
    echo "String is empty";
fi

Output:

String is not empty

Check string length equal to 0: This operator is used to check the string is empty. Syntax:

[ -z Operand ]

Example:

php

#!/bin/sh

str="";
if [ -z $str ]
then
    echo "String is empty";
else
    echo "String is not empty";
fi

Output:

String is empty

Shell Scripting - Here Strings

bilal-hungund

Improve

Article Tags :

Similar Reads

Shell Scripting - Here Strings

Here String is a kind of string that is used for input redirection from text or a variable. In here string Input will be mentioned in the same line within the quotes. the string inside the quotes is known as the Here string and Its command contains "<<<" (3 less than the symbol). Here strin

Shell Script to Join a String

There are different ways to concatenate strings in the shell. Some of them are listed below. String concatenation is used in shell scripting to make it much easier for the user to understand and use the program. Appending strings also allow the programmer to learn the working of concatenation on the

String Manipulation in Shell Scripting

String Manipulation is defined as performing several operations on a string resulting change in its contents. In Shell Scripting, this can be done in two ways: pure bash string manipulation, and string manipulation via external commands. Basics of pure bash string manipulation: 1. Assigning content

Shell Script to Split a String

Shell Scripting or Shell Programming is just like any other programming language. A shell is a special program that provides an interface between the user and the operating system. In Linux/Unix the default shell used is bash and in windows, it is cmd(command prompt). We use the terminal to run a sh

Shell Script to Concatenate Two Strings

String concatenation is the process of appending a string to the end of another string. This can be done with shell scripting using two methods: using the += operator, or simply writing strings one after the other. The examples below show some shell scripts that can be used to concatenate strings. E

Bash Scripting - Split String

In this article, we will discuss how to split strings in a bash script. Dividing a single string into multiple strings is called string splitting. Many programming languages have a built-in function to perform string splitting but there is no built-in function in bash to do so. There are various met

Batch Script - Strings

A Bash script is a plain text file. This file contains different commands for step-by-step execution. These commands can be written directly into the command line but from a re-usability perceptive it is useful to store all of the inter-related commands for a specific task in a single file. We can u

Shell Script Examples

For all the Linux distributions, the shell script is like a magic wand that automates the process, saves users time, and increases productivity. This shall scripting tutorial will introduce you to the 25 plus shall scripting examples. But before we move on to the topic of shell scripting examples, l

Bash Scripting - String

Bash String is a data type similar to integer or boolean. It is generally used to represent text. It is a string of characters that may also contain numbers enclosed within double or single quotes. Example: "geeksforgeeks", "Geeks for Geeks" or "23690" are strings Creating a String A basic declarati

Bash Scripting - Substring

sIn this article, we will discuss how to write a bash script to extract substring from a string. Extracting an Index-Based Substring There are various ways to obtain substring based on the index of characters in the string: Using cut commandUsing Bash substringUsing expr substr commandUsing awk comm