How to Concatenate two string variables in Bash Script

Command:

str3=”$str1 $str2″

The above example command will concatenate values of str1 and str2 stings and store it in third variable str3. Make sure there should not be any space before or after the assignment ( = ) operator.

Example 1:

It is simply write two or more strings variable one after one for concatenating them together.

$ str1="Hello"
$ str2="World"
$ str3="$str1 $str2"
$ echo $str3
> Hello World

Example 2:

It is not required that both string should be variable, We can use one variable and other direct sting to concatenate them.

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

Example 3:

We can simply write string variable one after one using $ symbol to concatenate two strings

$ str1="Hello"
$ str2="World"
$ str3=$str1$str2
$ echo $str3
> HelloWorld