This document discusses the Crystal programming language and compares it to Ruby. Crystal is a compiled, statically typed language that is inspired by Ruby. It aims to provide Ruby-like syntax and semantics but with better performance due to being compiled ahead of time. The document provides examples of Crystal code and demonstrates how Crystal is faster than Ruby for the Fibonacci number problem due to being compiled. It also highlights some key differences between Crystal and Ruby like static typing, overloading, and macros.
The document is a presentation in Japanese about character sets and collations in MySQL. It discusses how MySQL treats emoji characters like sushi and beer the same by default, but PostgreSQL does not. It explains that MySQL has both a character set (which defines how characters are encoded as bytes) and collation (which defines the sorting rules). For the UTF-8 character set, it shows the different collation options and how they treat letters, emojis, hiragana/katakana, and case sensitivity differently. It expresses a need for a Japanese-specific collation that properly distinguishes Japanese characters.
25. nsinit
Ubuntu の場合
# go get github.com/docker/libcontainer/nsinit
# cd /var/lib/docker/execdriver/native/コンテナID
# nsinit exec bash
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