# Key-mapping **URL:** \ **Category:** Ruby\ **Created:** [December 21, 2005, 3:24pm UTC](https://www.ruby-forum.com/t/key-mapping/74182 "2005-12-21T15:24:48Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![gunnar](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/g/ed655f/32.png) [@gunnar](https://www.ruby-forum.com/u/gunnar)\ **Post date:** [December 21, 2005, 3:24pm UTC](https://www.ruby-forum.com/t/key-mapping/74182/1 "2005-12-21T15:24:48Z")
Hi all I know this is not a Ruby thing, but I try anyhow. When I’m using irb on my Linux system the cursor keypad works great, ie the leftarrow backspace and uparrow gives me the previous line. Using my iMac the keypad only results in an escape sequence (^[[A for uparrow, ^[[C for leftarrow etc). I have not been able to find any key-mapping in irb, or in the terminal setup. All help appreciated Gunnar ---
**Author:** ![gunnar](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/g/ed655f/32.png) [@gunnar](https://www.ruby-forum.com/u/gunnar)\ **Post date:** [December 21, 2005, 10:20pm UTC](https://www.ruby-forum.com/t/key-mapping/74182/2 "2005-12-21T22:20:31Z")
Ryan Thank you very much. Went to article, did what it said -\>everything works great. Best regards Gunnar ---
**Author:** ![gunnar](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/g/ed655f/32.png) [@gunnar](https://www.ruby-forum.com/u/gunnar)\ **Post date:** [December 21, 2005, 9:15pm UTC](https://www.ruby-forum.com/t/key-mapping/74182/3 "2005-12-21T21:15:48Z")
That functionality is provided by the readline library, which I don’t think is setup with Ruby by default on Mac OS X (or maybe it is but you just need to enable that option on irb.) But either way the Ruby provided with Mac OS X is broken in various ways. Here is information on how to properly set up Ruby on a Mac: > **[Dan Benjamin](https://danbenjamin.com)** > > Dan Benjamin's personal website. Ryan