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echo "Hooray!"
fi
Variables are interpolated when in double-quotes, but not when they are in single-quotes:
$ X="Test"
$ echo "$X"
Test
$ echo '$X'
$X
$ echo $X
Test
One advantage to using double-quotes is that the variable value will be treated as a single argument even when it contain spaces. For example:
$ touch "test file"
$ NAME="test file"
$ rm $NAME
rm: cannot remove `test': No such file or directory
rm: cannot remove `file': No such file or directory
$ rm "$NAME"
You may optionally place the variable name within curly-braces (useful if there is text immediately after the variable name):
