# Roll back to last command in irb **URL:** \ **Category:** Ruby\ **Created:** [January 10, 2010, 7:27am UTC](https://www.ruby-forum.com/t/roll-back-to-last-command-in-irb/181338 "2010-01-10T07:27:12Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![rubynut](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/8e8cbc/32.png) [@rubynut](https://www.ruby-forum.com/u/rubynut)\ **Post date:** [January 10, 2010, 7:27am UTC](https://www.ruby-forum.com/t/roll-back-to-last-command-in-irb/181338/1 "2010-01-10T07:27:12Z")
Hello, I’m using ruby under ubuntu Linux, ruby version is 1.9.1 What the problem is, when using irb I can’t roll back the command to the last one with “up” key in keyboard. The result as below: irb(main):001:0\> File.file? “/etc/passwd” =\> true irb(main):002:0\> ^[[A # can’t roll back here Do you know how to configure irb to resolve it? Thanks. ---
**Author:** ![rubynut](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/8e8cbc/32.png) [@rubynut](https://www.ruby-forum.com/u/rubynut)\ **Post date:** [January 11, 2010, 8:09am UTC](https://www.ruby-forum.com/t/roll-back-to-last-command-in-irb/181338/2 "2010-01-11T08:09:32Z")
On Sun, Jan 10, 2010 at 5:40 PM, Marvin Gülker [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > Did you compile Ruby yourself? If so, install one of the packages > libreadline5-dev or libreadline6-dev and then compile again. Yes coz my ubuntu doesn’t have a ruby pre-installed, so I got the source from [ruby-lang.org](http://ruby-lang.org) and installed it by hand. I have resolved the problem following your suggestion. Thanks. ---
**Author:** ![rubynut](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/8e8cbc/32.png) [@rubynut](https://www.ruby-forum.com/u/rubynut)\ **Post date:** [January 10, 2010, 10:40am UTC](https://www.ruby-forum.com/t/roll-back-to-last-command-in-irb/181338/3 "2010-01-10T10:40:06Z")
Ruby N. wrote: > Hello, > > I’m using ruby under ubuntu Linux, ruby version is 1.9.1 > What the problem is, when using irb I can’t roll back the command to > the last one with “up” key in keyboard. > The result as below: > > irb(main):001:0\> File.file? “/etc/passwd” > =\> true > irb(main):002:0\> ^[[A # can’t roll back here > > Do you know how to configure irb to resolve it? > > Thanks. Did you compile Ruby yourself? If so, install one of the packages libreadline5-dev or libreadline6-dev and then compile again. Marvin ---
**Author:** ![rubynut](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/8e8cbc/32.png) [@rubynut](https://www.ruby-forum.com/u/rubynut)\ **Post date:** [January 11, 2010, 1:23pm UTC](https://www.ruby-forum.com/t/roll-back-to-last-command-in-irb/181338/4 "2010-01-11T13:23:14Z")
2010/1/11 Ruby N. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid): > On Sun, Jan 10, 2010 at 5:40 PM, Marvin Gülker [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > > > Did you compile Ruby yourself? If so, install one of the packages > > libreadline5-dev or libreadline6-dev and then compile again. > > Yes coz my ubuntu doesn’t have a ruby pre-installed, so I got the > source from [ruby-lang.org](http://ruby-lang.org) and installed it by hand. > I have resolved the problem following your suggestion. Thanks. You are aware that there is a packaged Ruby 1.9 available, are you? [http://packages.ubuntu.com/karmic/ruby1.9](http://packages.ubuntu.com/karmic/ruby1.9) Kind regards robert ---
**Author:** ![rubynut](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/8e8cbc/32.png) [@rubynut](https://www.ruby-forum.com/u/rubynut)\ **Post date:** [January 13, 2010, 11:01am UTC](https://www.ruby-forum.com/t/roll-back-to-last-command-in-irb/181338/5 "2010-01-13T11:01:55Z")
Robert K. wrote: > You are aware that there is a packaged Ruby 1.9 available, are you? > > [Ubuntu – Error](http://packages.ubuntu.com/karmic/ruby1.9) BTW, there’s also ruby1.9.1: [Ubuntu – Error](http://packages.ubuntu.com/karmic/ruby1.9.1) Which of these two packages should “we” install? I’m talking about a development box, not a production one. I was thinking that maybe ruby1.9 is a snapshot and therefore sometimes wouldn’t work. So I installed ruby1.9.1. Am I correct? ---
**Author:** ![rubynut](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/8e8cbc/32.png) [@rubynut](https://www.ruby-forum.com/u/rubynut)\ **Post date:** [January 13, 2010, 12:51pm UTC](https://www.ruby-forum.com/t/roll-back-to-last-command-in-irb/181338/6 "2010-01-13T12:51:30Z")
2010/1/13 Albert S. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid): > Robert K. wrote: > > > You are aware that there is a packaged Ruby 1.9 available, are you? > > > > [Ubuntu – Error](http://packages.ubuntu.com/karmic/ruby1.9) > > BTW, there’s also ruby1.9.1: > > [Ubuntu – Error](http://packages.ubuntu.com/karmic/ruby1.9.1) Good point! > Which of these two packages should “we” install? > > I’m talking about a development box, not a production one. I was > thinking that maybe ruby1.9 is a snapshot and therefore sometimes > wouldn’t work. So I installed ruby1.9.1. Am I correct? That’s what I’d do, too. robert ---
**Author:** ![rubynut](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/8e8cbc/32.png) [@rubynut](https://www.ruby-forum.com/u/rubynut)\ **Post date:** [January 13, 2010, 4:01pm UTC](https://www.ruby-forum.com/t/roll-back-to-last-command-in-irb/181338/7 "2010-01-13T16:01:45Z")
> > I’m talking about a development box, not a production one. I was > > thinking that maybe ruby1.9 is a snapshot and therefore sometimes > > wouldn’t work. So I installed ruby1.9.1. Am I correct? Ruby1.9 is an old release of ruby1.9.0, and is the only one available on Ubuntu releases before Karmic. Ruby1.9.1 is ruby1.9.1 patchlevel 243 (in Karmic anyway) and is probably fine, but I personally compile mine from source. -Jonathan N.