How to concatenate string variables in Bash

Here are few preferred ways to concatenate string variables in bash script

Concatenate string variables in Bash

1.Write the variable one after another in echo

#!/bin/bash
var1="Techieroop"
var2="${var1} Tutorial"
echo "${var2}"
##output
Techieroop Tutorial

2. Use += assignment operator:

#!/bin/bash
var="Techieroop"
var+=" Tutorial"
echo "$var"

##output
Techieroop Tutorial

Second method can be used to append to an integer as well

test.sh

#!/bin/bash
int1=18
((int1+=86))
echo "Sum is $int1"

#$ sh test.sh
#Sum is 104