Simon Willison’s Weblog

Mac OS X Leopard: UNIX. Leopard ships with DTrace, and it’s been hooked in to Java, Ruby, Python and Perl.

Posted 11th June 2007 at 11:05 pm

Recent articles

OpenAI are quietly adopting skills, now available in ChatGPT and Codex CLI - 12th December 2025
GPT-5.2 - 11th December 2025
Useful patterns for building HTML tools - 10th December 2025

dtrace 2 java 89 leopard 14 macos 103 perl 28 python 1212 ruby 72

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