Concatenar Strings in Bash: Full Guide and Practice

Most programming languages allow the concatenation of two or more strings. A language that makes this process extremely simple is the bash.

What makes Bash a great option is that string variables can be concatenated without the need for dedicated commands or functions. In other words, to combine string data, users can resort to direct manipulation of the variables or apply the same logic with the Addition Assignment Operator (+=).

In this tutorial, we will present the Bash script, explain what is the character chain concatenation and describe different ways to concatenate strings in Bash.

What is a Bash script?

Bash Shell Scripting allows users to perform hundreds of Linux commands with just one script instead of having to write them one by one.

It is an extremely useful resource for developers who seek to automate operations on their physical servers or private virtual servers (VPS), raising productivity.

For example, any command that a user runs in a native environment or a terminal can be placed on a Bash script. This also applies to functions, so instead of writing them every time, programmers just need to write the function only once and then reuse it in any other script Bash.

Any script starts with a .sh file and contains a structure similar to that indicated below:

#!/bin/bash
# Creates a new variable "Hello, World"
mybashvariable="Hello, World"
echo $mybashvariable

The first line informs the terminal that the script must be run exclusively using Bash. All the remaining lines make up the script itself.

In this specific example, the script created a new variable called mybabeshvariable and attributed to it a value “HELLO, World”, Which will be the output displayed by the script.

String concatenation – adding one variable after another

The simplest String concatenation method is to add one string variable after another. In the next sections we will present three different ways to do this.

Concatenation with literal strings

Literal strings, or literal strings, are literally displayed (print), and there are two methods for this – using simple quotes or the inverted bar symbol with double marks. In the following example, we will create a literal string variable without quotes and display it with the Echo command:

#!/bin/bash
variablename=\usr\bin\env
echo "$variablename"

In this case, the result would be:

# Result
usrbinenv

Now, when we add Simple quotation or pairs To the name of the string variable, the Echo command will display (print) the value literally:

#!/bin/bash
variablename="\usr\bin\env"
echo "$variablename"

Here is the result:

# Result
\usr\bin\env

Then just apply this logic to concatenate two strings:

#!/bin/bash
variablename="\usr\bin\env"
echo "$variablename Bash_Is_Awesome"

We can also involve the variable of the last line with parentheses () To protect it. Keys {} are more useful when there are a variety of variables:

echo "${variablename} Bash_Is_Awesome"

In both cases, the result will be displayed as:

\usr\bin\env Bash_Is_Awesome

Multiple Variable Concatenation

Multiple strings can be easily concatenated by directly manipulating variables.

For example, in the Example Bash Script, we will use three different variables to create combined values. The Echo command will display (print) the string data:

#!/bin/bash
variablename="\usr\bin\env "
myvariable="_Awesome"
anothervariable="$variablename"Bash_Is"$myvariable"
echo "$anothervariable"

The output generated will be similar to:

\usr\bin\env Bash_Is_Awesome

Numbers and Strings Concatenation

The Bash Script tool allows users to concatenate one or more variables other than the string type. For this reason it is also possible to concatenate multiple variables, which can be both strings and numbers:

#!/bin/bash
firstvariable=" Hello, World "
secondvariable="Hello, WA Affordable Web Design Agency "
thirdvariable=" I now know how to concatenate strings in bash."
fourthvariable="$secondvariable"and"$firstvariable"means"$thirdvariable"
echo $fourthvariable

Another way to unite two or more strings to create a concatenated string is using addition (+=) addition operator. With this operator you can connect strings using one or more variables.

For example, the script presented below can be used to concatenate two strings through a single variable:

#!/bin/bash
mystring="I would like to generate a meaningful output, please. "
mystring+="Not a chance, friend!"
echo "$mystring"

A similar output can be generated with the use of two variables:

#!/bin/bash
firststring="This is a single string. "
secondstring="Which makes this a resulting string."
# Curly brackets between $secondvariable are called variable interpolation.
firststring+="${secondstring}"
echo $firststring

Numerical Strings Concatenand

The addition operator method can also be used to attach exclusively variables of numerical strings.

#!/bin/bash
numeric_string=2050
numeric_string+=0502
echo $numeric_string

However, if you want to add the numbers, another logic needs to be applied:

#!/bin/bash
x=3
y=5
z=6
((x+=y+=z))
echo $x

Concatenando strings with bash for loop

A more advanced way to use the functionality of concatenar strings in BASH is to implement it within a for loop.

In the following example, we have a variable Myvariable with three strings; and a variable called results with an empty string. With the help of the loop either of Bash, it becomes possible to combine the strings of the variable Myvariable with our spring:

#!/bin/bash
myvariable="bash concatenation WA Affordable Web Design Agency"
results=""
for i in $myvariable
do
results+="The answer is $i... "
done
echo $results

Conclusion

Bash programming language is a convenient and efficient tool for performing various variable manipulation actions. One of the most important examples is its ability to unite different string variables in one.

In this tutorial, we present the definition of concatenation and Bash Scripting. We also indicate how to concatenate strings through two different methods.

We hope this tutorial has helped you better understand the subject. If you have any questions, feel free to comment on the section below.

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