Ruby Programming - Command Line

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Command Line

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irb is run from the command line.

irb [
            irb-options
            ] [
            ruby_script
            ] [
            options
            ]

The command-line options for irb are listed in Table B.1 on page 518. Typically, you'll run irb with no options, but if you want to run a script and watch the blow-by-blow description as it runs, you can provide the name of the Ruby script and any options for that script.

irb command-line options

Option	Description
`-f`	Suppress reading `~/.irbrc`.
`-m`	Math mode (fraction and matrix support is available).
`-d`	Set `$DEBUG` to true (same as ```ruby -d`'').
`-r load-module`	Same as ```ruby -r`''.
`--inspect`	Use ``inspect'' for output (the default, unless in math mode).
`--noinspect`	Do not use inspect for output.
`--readline`	Use `Readline` extension module.
`--noreadline`	Do not use `Readline` extension module.
`--prompt` prompt-mode	Switch prompt mode. Predefined prompt modes are ``default'', ``simple'', ``xmp'', and ``inf-ruby''.
`--prompt-mode` prompt-mode	Same as `--prompt`.
`--inf-ruby-mode`	Sets up irb to run in `inf-ruby-mode` under Emacs. Changes the prompt and suppresses `--readline`.
`--simple-prompt`	Simple prompt mode.
`--noprompt`	Do not display a prompt.
`--tracer`	Display trace for execution of commands.
`--back-trace-limit n`	Display backtrace information using the top n and last n entries. The default value is 16.
`--irb_debug n`	Set internal debug level to n (only for irb development).
`-v, --version`	Print the version of irb.

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