Document one-liner for URL decoding

Closes #506.

content/posts/2019-05-31-url-decode-ruby-cli.md

+---
+title: URL Decoding with Ruby on the Command Line
+description: How to use Ruby's standard library to decode URLs with a handy one-liner.
+categories:
+- blogumentation
+tags:
+- blogumentation
+- ruby
+- cli
+date: 2019-05-31T21:58:11+0100
+license_prose: CC-BY-NC-SA-4.0
+license_code: Apache-2.0
+slug: url-decode-ruby-cli
+---
+When working with URLs that contain other URLs (such as a `redirect_uri` in an OAuth2 authorization request), you may get annoyed when you can't decode the encoded URL, **??**.
+
+Following the advice from [this Stack Overflow answer](https://stackoverflow.com/a/7146153/2257038), we can use `CGI.unescape`, and create a nice command-line one-liner:
+
+```sh
+ruby -rcgi -e 'puts CGI.unescape(ARGF.read)'
+```
+
+This lets us i.e. run:
+
+```sh
+$ echo 'https%3A%2F%2Fwww.jvt.me' | ruby -rcgi -e 'puts CGI.unescape(ARGF.read)'
+https://www.jvt.me
+```

permalinks.yml

 ---
 posts:
+- https://www.jvt.me/posts/2019/05/31/url-decode-ruby-cli/
 - https://www.jvt.me/posts/2019/05/26/why-wwwjvtme/
 - https://www.jvt.me/posts/2019/05/26/hugo-render/
 - https://www.jvt.me/posts/2019/05/22/ical-events-hugo/