Bash Concatenate Strings

Bash Concatenate Strings

In Bash scripting, concatenating strings is useful for various tasks where you need to combine multiple strings into a single string.

Syntax

string1="Hello"
string2="World"
result="$string1 $string2"

The basic syntax involves using double quotes and the $ symbol to concatenate strings.

Example Bash Concatenate Strings

Let's look at some examples of how to concatenate strings in Bash:

1. Concatenate Two Strings

This script concatenates two strings stored in the variables str1 and str2 and prints the result.

#!/bin/bash

str1="Hello"
str2="World"
result="$str1 $str2"
echo "$result"

In this script, the variables str1 and str2 are assigned the values 'Hello' and 'World', respectively. The result of concatenating these strings with a space in between is stored in the variable result. The script then prints the concatenated string.

Concatenate two strings in Bash

2. Concatenate Multiple Strings

This script concatenates three strings stored in the variables str1, str2, and str3 and prints the result.

#!/bin/bash

str1="Hello"
str2="," 
str3="World!"
result="$str1$str2 $str3"
echo "$result"

In this script, the variables str1, str2, and str3 are assigned the values 'Hello', ',', and 'World!', respectively. The result of concatenating these strings with appropriate spaces is stored in the variable result. The script then prints the concatenated string.

Concatenate multiple strings in Bash

3. Concatenate Strings with User Input

This script prompts the user to enter two strings, concatenates them, and prints the result.

#!/bin/bash

read -p "Enter the first string: " str1
read -p "Enter the second string: " str2
result="$str1 $str2"
echo "The concatenated string is: '$result'"

In this script, the user is prompted to enter two strings, which are stored in the variables str1 and str2. The result of concatenating these strings with a space in between is stored in the variable result. The script then prints the concatenated string.

Concatenate strings with user input in Bash

Conclusion

Concatenating strings in Bash is a fundamental task for combining multiple strings into a single string in shell scripting. Understanding how to concatenate strings can help you manage and manipulate strings effectively in your scripts.