High Performance PostgreSQL for Rails

Conventions Used in This Book

Most of the code snippets are placed in external files with an extension that helps describe their type and provides syntax highlighting. Some of the files are shell scripts, SQL, or Ruby. For code snippets in exercises, copy and paste them from these files instead of trying to type them in to save yourself time and avoid mistakes.

Shell script files (.sh) may start with a “shebang” line like #!/usr/bin/env bash. When that’s included, it means the script can be run from your terminal.

When there’s no shebang line, the intention is to run those commands individually. The commands were placed in a .sh file in those cases to make it easier to copy and paste them and for syntax highlighting.

For CLI programs that support ...