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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.
Recent Insights Page 17
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Test Credit Card Numbers
A reference list of valid credit card numbers for testing payment gateway integrations (Visa, MasterCard, Amex).
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Global GIT ignore files
How to configure a global gitignore file to exclude .DS_Store and other system files on macOS.
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Useful Unix find commands
A collection of useful Unix 'find' command one-liners for locating files by size, date, and type.
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Setting up SSH access without a password?
A guide to generating SSH keys and configuring passwordless authentication between servers.