add
Backslash is literal, so explicitly escape it rather than rely on fallback behavior. ShellCheck SC1117 https://github.com/koalaman/shellcheck/wiki/SC1117
Braces are only required in certain cases, but the cognitive overhead in keeping track of which cases require braces can be reduced by simply always using them. Example: `${NAME}` Retain more widely-used braces `$NAME` convention in documentation.
