polarathene 6f7eb8bd97 chore: 6/6 - Update shell syntax ...

- `==` for string equality since we're using bash `[[ test ]]` already.
- Uppercase `socket_file` variable to be consistent with other internal variables used in the script.
- Convert `[ test ]` to `[[ test ]]` for consistency, improving maintenance. Double-bracket (_not posix compatible_) does not require quoted variables, ShellCheck lint knows this is safe too :)
- `-z` test for `$RESOLVERS` is native syntax to check for empty string value.
- Referenced variables should generally be wrapped like so `"${VAR}"`.
- Variable assignments with string values should be double quotes for content with variables, otherwise use single quotes (_no interpolation_).
- Converted my if statements to use the same style used in the rest of the file.

2021-09-28 21:50:11 +13:00

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