There are three quote characters in bash shell: double quote("), single quote(') and backslash(\). In this tutorial, we will take a look at double quotes.
Double quotes work similarly to single quotes except there are some fewer restrictions. Following are the three special characters that are not ignored inside double quotes: dollar sign($), backquotes(`) and backslash(\).
Unlike single quotes, if you try to access the value of variable inside double quotes, then you will able to access it.
double=123 echo '$double' echo "$double"
You can even use double quotes when you are passing command-line arguments to a command.
$grep "Mohit Natani" students.txt
students.txt:S001 | Mohit Natani | Computer Science | 98%
Also, all the white spaces enclosed within double quotes are preserved by the shell.
echo bash shell scripting echo "bash shell scripting"
bash shell scripting bash shell scripting