Throughout your programming career you'll find that there are quite a few times you need to extract a substring from another string. Strings are one of the most common data structures, so this comes up often. I bet you could tell me how to do it in your favorite programming
For a long time, user authentication on the web consisted of storing some very simple data (like a user ID) in the user's browser as a cookie. This worked pretty well (and still does for many applications), but sometimes you require some more flexibility.
Traditionally, to get this flexibility you
Over the last 5-10 years, the JSON format has been one of, if not the most, popular ways to serialize data. Especially in the web development world, you'll likely encounter JSON through one of the many REST APIs, application configuration, or even simple data storage.
Given its prevalence and impact
The Unix command scp (which stands for "secure copy protocol") is a simple tool for uploading or downloading files (or directories) to/from a remote machine. The transfer is done on top of SSH, which is how it maintains its familure options (like for specifying identities and credentials) and ensures