A/B tests, going downstream
Strategies for running backend A/B tests to measure downstream impact on user behavior and product quality.
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SSL how to get an A+ rating with Nginx
Configuration guide for Nginx to achieve an A+ SSL rating, including cipher suites and Diffie-Hellman parameters.
Load testing a website with Siege
A guide to benchmarking and load testing web applications using the Siege command-line tool.
copying directories between servers compressed
How to efficiently copy and compress directories between servers using tar and SSH pipes.
Find Out My Linux Distribution Name and Version
How to identify which Linux distribution and version you are running using terminal commands like lsb_release.
bash history
Tips for searching and using the Bash shell history interactively to improve command-line productivity.
Flushing the DNS cache on a Mac (OS X), Linux and Windows
Commands to flush the DNS cache on various versions of macOS (OS X), Linux, and Windows systems.
Test Credit Card Numbers
A reference list of valid credit card numbers for testing payment gateway integrations (Visa, MasterCard, Amex).