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At the irb prompt, you can enter any valid Ruby expression and see the
results. You can also use any of the following commands to control
the irb session.
-
exit, quit, irb_exit
-
Quits this irb session or subsession.
If you've used
cb to change bindings (see below), exits from
this binding mode.
-
conf, irb_context
-
Displays current configuration. Modifying the configuration is
achieved by invoking methods of
conf.
-
conf.back_trace_limit n
-
Sets display lines of backtrace as top n and tail n.
The default value is 16.
-
conf.debug_level = N
-
Sets debug level of irb.
-
conf.ignore_eof = true/false
-
Specifies the behavior of an end of file received on input.
If true, it will be ignored; otherwise, it will quit irb.
-
conf.ignore_sigint= true/false
-
Specifies the behavior of ^C (control-c).
If false, ^C will quit irb. If true, ^C
during input will cancel input and return to the top level;
during execution, ^C will abort the current operation.
-
conf.inf_ruby_mode = true/false
-
If
true, changes the prompt and disables readline support,
allowing irb to work with
inf-ruby-mode. [inf-ruby-mode allows Emacs
users to interact with
Ruby while editing programs. See the file inf_ruby.el in the
misc directory of the distribution for more details.] The
default value is false.
-
conf.inspect_mode = true/false/nil
-
Specifies inspect mode according to the following values:
true
|
Display inspect (default). |
false
|
Display to_s. |
nil
|
Inspect mode in non-math mode,
non-inspect mode in math mode. |
-
conf.irb_level
-
Displays the current binding level (see
cb).
-
conf.math_mode
-
Displays whether or not Ruby is in math mode.
-
conf.use_loader = true/false
-
Specifies whether or not irb's own file reader method is used with
load/require.
-
conf.prompt_c
-
The prompt for a continuing statement
(for example, immediately after an ``if'').
-
conf.prompt_i
-
The standard, top-level prompt.
-
conf.prompt_s
-
The prompt for a continuing string.
-
conf.rc = true/false
-
Specifies whether or not to use the initialization file
~/.irbrc.
-
conf.use_prompt = true/false
-
Specifies whether or not to display prompts.
-
conf.use_readline = true/false/nil
-
Specifies whether or not to use Readline according to the following
values:
true
|
Use Readline. |
false
|
Do not use Readline. |
nil
|
Use Readline except for inf-ruby-mode (default). |
-
conf.verbose=true/false
-
Specifies whether or not verbose messages are displayed.
-
cb, irb_change_binding [
obj
]
-
Creates and enters a new binding that has its own scope for
local variables. If obj is given, it will be used as self in
the new binding.
-
irb [obj]
-
Starts an irb subsession. If obj is given, it will be used
as self.
-
jobs, irb_jobs
-
Lists irb subsessions.
-
fg n, irb_fg n
-
Switches into the specified irb subsession. n may be any of the
following values:
| irb subsession number |
| thread id |
| irb object |
| self (the obj that launched a particular subsession) |
-
kill n, irb_kill n
-
Kills an irb subsession. n may be any of the values as described
for
irb_fg.
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