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+#
+# irb/lc/help-message.rb -
+# $Release Version: 0.7.3$
+# $Revision$
+# $Date$
+# by Keiju ISHITSUKA(keiju@ishitsuka.com)
+#
+# --
+#
+#
+#
+Usage: irb.rb [options] [programfile] [arguments]
+ -f suppress read ~/.irbrc
+ -m bc mode (load mathn, fraction or matrix are available)
+ -d set $DEBUG to true (same as `ruby -d')
+ -r load-module same as `ruby -r'
+ --inspect uses `inspect' for output (the default except bc mode)
+ --noinspect doesn't uses inspect for output
+ --readline uses Readline extension module
+ --noreadline doesn't use Readline extension module
+ --prompt prompt-mode
+ --prompt-mode prompt-mode
+ switches prompt mode. Pre-defined prompt modes are
+ `default', `simple', `xmp' and `inf-ruby'
+ --inf-ruby-mode uses prompt appreciate for inf-ruby-mode on emacs.
+ Suppresses --readline.
+ --simple-prompt simple prompt mode
+ --noprompt no prompt
+ --tracer display trace for each execution of commands.
+ --back-trace-limit n
+ displayes backtrace top n and tail n. The default
+ value is 16.
+ --irb_debug n sets internal debug level to n (It shouldn't be used)
+ -v, --version prints the version of irb