IRB.conf[:AP_NAME]
IRB.conf[:RC]
IRB.conf[:LOAD_MODULES]
IRB.conf[:IRB_NAME]
irb#2
IRB.conf[:USE_MULTILINE]
IRB.conf[:USE_SINGLELINE]
IRB.conf[:USE_COLORIZE]
IRB.conf[:INSPECT_MODE]
IRB.conf[:PROMPT_MODE]
IRB.conf[:AUTO_INDENT]
^C
^D
IRB.conf[:ECHO]
IRB.conf[:NEWLINE_BEFORE_MULTILINE_OUTPUT]
IRB.conf[:VERBOSE]