Index of Command-Line Options

These are the IRB command-line options, with links to explanatory text:

• -d: Set $DEBUG and $VERBOSE to true.
• -E _ex_[:_in_]: Set initial external (ex) and internal (in) encodings (same as ruby -E).
• -f: Don't initialize from configuration file.
• -I _dirpath_: Specify $LOAD_PATH directory (same as ruby -I).
• -r _load-module_: Require load-module (same as ruby -r).
• -U: Set external and internal encodings to UTF-8.
• -w: Suppress warnings (same as ruby -w).
• -W[_level_]: Set warning level; 0=silence, 1=medium, 2=verbose (same as ruby -W).
• --autocomplete: Use auto-completion.
• --back-trace-limit _n_: Set a backtrace limit; display at most the top n and bottom n entries.
• --colorize: Use color-highlighting for input and output.
• --context-mode _n_: Select method to create Binding object for new workspace; n in range 0..5.
• --echo: Print (echo) return values.
• --extra-doc-dir _dirpath_: Add a documentation directory for the documentation dialog.
• --inf-ruby-mode: Set prompt mode to :INF_RUBY (appropriate for inf-ruby-mode on Emacs); suppresses --multiline and --singleline.
• --inspect: Use method inspect for printing (echoing) return values.
• --multiline: Use the multiline editor as the input method.
• --noautocomplete: Don't use auto-completion.
• --nocolorize: Don't use color-highlighting for input and output.
• --noecho: Don't print (echo) return values.
• --noecho-on-assignment: Don't print (echo) result on assignment.
• --noinspect: Don't se method inspect for printing (echoing) return values.
• --nomultiline: Don't use the multiline editor as the input method.
• --noprompt: Don't print prompts.
• --noscript: Treat the first command-line argument as a normal command-line argument, and include it in ARGV.
• --nosingleline: Don't use the singleline editor as the input method.
• --noverbose: Don't print verbose details.
• --prompt _mode_, --prompt-mode _mode_: Set prompt and return formats; mode may be a pre-defined prompt or the name of a custom prompt.
• --script: Treat the first command-line argument as the path to an initialization script, and omit it from ARGV.
• --simple-prompt, --sample-book-mode: Set prompt mode to :SIMPLE.
• --singleline: Use the singleline editor as the input method.
• --tracer: Use Tracer to print a stack trace for each input command.
• --truncate-echo-on-assignment: Print (echo) truncated result on assignment.
• --verbosePrint verbose details.
• -v, --version: Print the IRB version.
• -h, --help: Print the IRB help text.
• --: Separate options from arguments on the command-line.