Add docs about quoting

README.md

@@ -66,9 +66,25 @@ without any imports.
 Executes a given string using the `spawn` function from the
 `child_process` package and returns `ProcessPromise<ProcessOutput>`.
 
+Everything passed through `${...}` will be automatically escaped and quoted.
+
+```js
+let name = 'foo & bar'
+await $`mkdir ${name}`
+```
+
+There is no need to add extra quotes. Read more about it in 
+[quotes](docs/quotes.md).
+
+You can pass an array of arguments if needed:
+
 ```js
-let count = parseInt(await $`ls -1 | wc -l`)
-console.log(`Files count: ${count}`)
+let flags = [
+  '--oneline',
+  '--decorate',
+  '--color',
+]
+await $`git log ${flags}`
 ```
 
 For example, to upload files in parallel:

docs/quotes.md

@@ -0,0 +1,73 @@
+# Quotes
+
+When passing arguments to `${...}` there is no need to add quotes. **Quotes will 
+be added automatically if needed.**
+
+```js
+let name = 'foo & bar'
+await $`mkdir ${name}`
+```
+
+For quotes **zx** uses special bash syntax (next commands are valid bash):
+
+```bash
+mkdir $'foo & bar'
+$'ls' $'-la'
+```
+
+If you add quotes `"${name}"`, it will produce a wrong command. 
+
+If you need to add something extra, consider putting it inside curly brackets.
+
+```js
+await $`mkdir ${'path/to-dir/' + name}`
+```
+
+This will also work properly:
+
+```js
+await $`mkdir path/to-dir/${name}`
+```
+
+### Array of arguments
+
+The `zx` can also take an array or arguments in the `${...}`. Items of the array
+will be quoted separately and concatenated via a space. Do **not** add a `.join(' ')`.
+
+```js
+let flags = [
+  '--oneline',
+  '--decorate',
+  '--color',
+]
+await $`git log ${flags}`
+```
+
+If you already have a string with arrays, it's your responsibility
+to correctly parse it and distinguish separate arguments. For example like this:
+
+```js
+await $`git log ${'--oneline --decorate --color'.split(' ')}`
+```
+
+### globbing and `~`
+
+As everything passed through `${...}` will be escaped, you can't use `~` 
+or glob syntax. In order for this to work the zx provides 
+[globby package](../README.md#globby-package).
+
+For instead of this:
+
+```js
+let files = '~/dev/**/*.md'
+await $`ls ${files}`
+```
+
+Use `glob` function and `os` package:
+
+```js
+let files = await glob(os.homedir() + '/dev/**/*.md')
+await $`ls ${files}`
+```
+
+