Syntax highlighting is one thing. The double quotes another.

Each editor has its own dis-/advantages in this manner.

See my question on [SoftwareRecs][1] and its respective answers, most importantly [this for both CLI and GUI][2] and [this for GUI][3].

Notably, [Visual Studio Code][4], has **IMHO** the best Syntax highlighting from GUI editors.

From CLI editors, refer to the answer of `gVim`, which does the same syntax highlighting job for CLI.

Note that as I was a heavy `nano` user, I can tell you `nano` can't distinguish the variables inside quotes.

Finally, what should trouble you most is that you did not use - I suppose you're not used to it - bad habit - the double quotes. Please refer to StackOverflow for more information or simply use google.


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PS: Always pipe your scripts to [ShellCheck][5] ;)


  [1]: https://softwarerecs.stackexchange.com/q/50895/33363
  [2]: https://softwarerecs.stackexchange.com/a/50900/33363
  [3]: https://softwarerecs.stackexchange.com/a/50898/33363
  [4]: https://code.visualstudio.com/
  [5]: https://www.shellcheck.net/