HOW ONE LINE OF CODE CAUSED A $60 MILLION LOSS

Summary from the TLDR Web Dev newsletter

In 1990, half of AT&T’s phone network went down as a result of one line of C code, leading to a buggy implementation of call handling. The outage affected over a hundred thousand Americans and the company lost $60 million. This article goes over the buggy piece of code that was deployed by AT&T and how engineers fixed it and shares resources for understanding reliability engineering in the modern development world better.