# Why i can't find my ruby? **URL:** \ **Category:** ruby-talk\ **Created:** [21 November 2010 12:43 UTC](https://rubytalk.org/t/why-i-cant-find-my-ruby/60913 "2010-11-21T12:43:59Z")\ **Posts on this page:** 18\ **Page:** 1
**Author:** ![Pen\_Ttt](https://avatars.discourse-cdn.com/v4/letter/p/898d66/32.png) [@Pen\_Ttt](https://rubytalk.org/u/Pen_Ttt)\ **Post date:** [21 November 2010 12:43 UTC](https://rubytalk.org/t/why-i-cant-find-my-ruby/60913/1 "2010-11-21T12:43:59Z")
i installed ruby this way: sudo wget [ftp.ruby-lang.org/pub/ruby/1.9/ruby-1.9.2-p0.tar.bz2](http://ftp.ruby-lang.org/pub/ruby/1.9/ruby-1.9.2-p0.tar.bz2) sudo tar jxvf ruby-1.9.2-p0.tar.bz2 cd /home/pt/ruby-1.9.2-p0 sudo ./configure -prefix=/usr/local/ruby sudo make && make install sudo ln -s /usr/local/ruby/bin/ruby /usr/bin/ruby sudo ln -s /usr/local/ruby/bin/gem /usr/bin/gem sudo gedit /etc/environment PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/ruby/bin" when i restart, pt@pt:~$ ruby -v The program 'ruby' is currently not installed. You can install it by typing: sudo apt-get install ruby could you mind to tell me how to resolve it? > **···** > > -- > Posted via [http://www.ruby-forum.com/](http://www.ruby-forum.com/). ---
**Author:** ![David\_Unric](https://avatars.discourse-cdn.com/v4/letter/d/90db22/32.png) [@David\_Unric](https://rubytalk.org/u/David_Unric)\ **Post date:** [21 November 2010 13:57 UTC](https://rubytalk.org/t/why-i-cant-find-my-ruby/60913/2 "2010-11-21T13:57:11Z")
Pen Ttt wrote in post #962916: > i installed ruby this way: > sudo wget ftp.ruby-lang.org/pub/ruby/1.9/ruby-1.9.2-p0.tar.bz2 > sudo tar jxvf ruby-1.9.2-p0.tar.bz2 > cd /home/pt/ruby-1.9.2-p0 > sudo ./configure -prefix=/usr/local/ruby > sudo make && make install > sudo ln -s /usr/local/ruby/bin/ruby /usr/bin/ruby > sudo ln -s /usr/local/ruby/bin/gem /usr/bin/gem > sudo gedit /etc/environment PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/ruby/bin" > when i restart, > pt@pt:~$ ruby -v > The program 'ruby' is currently not installed. You can install it by > typing: > sudo apt-get install ruby > > could you mind to tell me how to resolve it? First you have to check whether the compilation & installation process did succeeded. Second the target prefix for configure script has two hyphens before so it has to look like:   sudo ./configure --prefix=/usr/local/ruby Third what is an output of \ls -l /usr/local/ruby/bin/ruby\ ? > **···** > > -- > Posted via [http://www.ruby-forum.com/\](http://www.ruby-forum.com/%5C). ---
**Author:** ![Rick\_DeNatale1](https://avatars.discourse-cdn.com/v4/letter/r/bbce88/32.png) [@Rick\_DeNatale1](https://rubytalk.org/u/Rick_DeNatale1)\ **Post date:** [21 November 2010 14:37 UTC](https://rubytalk.org/t/why-i-cant-find-my-ruby/60913/3 "2010-11-21T14:37:10Z")
> i installed ruby this way: > sudo wget ftp.ruby-lang.org/pub/ruby/1.9/ruby-1.9.2-p0.tar.bz2 > sudo tar jxvf ruby-1.9.2-p0.tar.bz2 > cd /home/pt/ruby-1.9.2-p0 > sudo ./configure -prefix=/usr/local/ruby > sudo make && make install First off you seem to be using sudo when it normally isn't used and not with it is. Normally do all of the steps up to and including make as a normal user and then do sudo make install and only if you are installing to a place which requires root privileges. Using sudo unnecessarily is dangerous since you really don't know what those commands might do particularly the make > sudo ln -s /usr/local/ruby/bin/ruby /usr/bin/ruby > sudo ln -s /usr/local/ruby/bin/gem /usr/bin/gem This is wrong, you are making /usr/local/ruby/bin/ruby point to the system installed ruby and the same thing for the gem executable. I'm not sure why you did this. If the make install worked it should have made ruby and gem accessible via /usr/loca/bin, probably via symlinks. And since you are setting the PATH environment variable to put /usr/local/bin ahead of /usr/bin the shell should find your installed ruby. I suspect that what happened is that the make install failed because you didn't run it under sudo. That all said, if it were me I'd install ruby using RVM > **···** > > On Sun, Nov 21, 2010 at 7:43 AM, Pen Ttt \ wrote: > > > sudo gedit /etc/environment > > > > PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/ruby/bin" > > when i restart, > > pt@pt:~$ ruby -v > > The program 'ruby' is currently not installed. You can install it by > > typing: > > sudo apt-get install ruby > > > > could you mind to tell me how to resolve it? > > > > -- > > Posted via [http://www.ruby-forum.com/\](http://www.ruby-forum.com/%5C). > > -- > Rick DeNatale > > Blog: [http://talklikeaduck.denhaven2.com/](http://talklikeaduck.denhaven2.com/) > Github: [rubyredrick (Rick DeNatale) · GitHub](http://github.com/rubyredrick) > Twitter: @RickDeNatale > WWR: [http://www.workingwithrails.com/person/9021-rick-denatale](http://www.workingwithrails.com/person/9021-rick-denatale) > LinkedIn: [http://www.linkedin.com/in/rickdenatale](http://www.linkedin.com/in/rickdenatale) ---
**Author:** ![Pen\_Ttt](https://avatars.discourse-cdn.com/v4/letter/p/898d66/32.png) [@Pen\_Ttt](https://rubytalk.org/u/Pen_Ttt)\ **Post date:** [22 November 2010 01:42 UTC](https://rubytalk.org/t/why-i-cant-find-my-ruby/60913/4 "2010-11-22T01:42:12Z")
thinks everyone.this right way is : sudo wget [ftp.ruby-lang.org/pub/ruby/1.9/ruby-1.9.2-p0.tar.bz2](http://ftp.ruby-lang.org/pub/ruby/1.9/ruby-1.9.2-p0.tar.bz2) sudo tar jxvf ruby-1.9.2-p0.tar.bz2 cd /home/pt/ruby-1.9.2-p0 sudo ./configure --prefix=/usr/local/ruby sudo make sudo make install sudo ln -s /usr/local/ruby/bin/ruby /usr/bin/ruby sudo ln -s /usr/local/ruby/bin/gem /usr/bin/gem sudo gedit /etc/environment PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/ruby/bin" > **···** > > -- > Posted via [http://www.ruby-forum.com/](http://www.ruby-forum.com/). ---
**Author:** ![Pen\_Ttt](https://avatars.discourse-cdn.com/v4/letter/p/898d66/32.png) [@Pen\_Ttt](https://rubytalk.org/u/Pen_Ttt)\ **Post date:** [29 November 2010 12:04 UTC](https://rubytalk.org/t/why-i-cant-find-my-ruby/60913/5 "2010-11-29T12:04:11Z")
when i installed ruby, pt@pt:~$ ruby -v ruby 1.9.2p0 (2010-08-18 revision 29036) [i686-linux] pt@pt:~$ irb The program 'irb' can be found in the following packages: \* ruby \* irb Try: sudo apt-get install \ what's wrong? > **···** > > -- > Posted via [http://www.ruby-forum.com/](http://www.ruby-forum.com/). ---
**Author:** ![Pen\_Ttt](https://avatars.discourse-cdn.com/v4/letter/p/898d66/32.png) [@Pen\_Ttt](https://rubytalk.org/u/Pen_Ttt)\ **Post date:** [2 December 2010 09:35 UTC](https://rubytalk.org/t/why-i-cant-find-my-ruby/60913/6 "2010-12-02T09:35:33Z")
$ cd /usr/bin $ sudo ln -s /usr/local/ruby/bin/irb irb PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/ruby/bin：/usr/local/ruby/bin:"${PATH}"" it'ok,think everyone > **···** > > -- > Posted via [http://www.ruby-forum.com/](http://www.ruby-forum.com/). ---
**Author:** ![Brian\_Candler](https://avatars.discourse-cdn.com/v4/letter/b/5f9b8f/32.png) [@Brian\_Candler](https://rubytalk.org/u/Brian_Candler)\ **Post date:** [21 November 2010 21:01 UTC](https://rubytalk.org/t/why-i-cant-find-my-ruby/60913/7 "2010-11-21T21:01:42Z")
Rick Denatale wrote in post #962943: > > sudo ln -s /usr/local/ruby/bin/ruby /usr/bin/ruby > > sudo ln -s /usr/local/ruby/bin/gem /usr/bin/gem > > This is wrong, you are making /usr/local/ruby/bin/ruby point to the > system installed ruby and the same thing for the gem executable. That's untrue. ln -s is   ln -s \ \ And in any case, the OP didn't have a system ruby anyway. I would start with typing     /usr/local/ruby/bin/ruby -v Does that work? If so, you want /usr/local/ruby/bin on your $PATH If not, look at the configure and make output to see what went wrong. > That all said, if it were me I'd install ruby using RVM Yes, that takes care of all this stuff and more. > **···** > > -- > Posted via [http://www.ruby-forum.com/\](http://www.ruby-forum.com/%5C). ---
**Author:** ![Ryan\_Davis1](https://yyz1.discourse-cdn.com/flex029/user_avatar/rubytalk.org/ryan_davis1/32/1848_2.png) [@Ryan\_Davis1](https://rubytalk.org/u/Ryan_Davis1)\ **Post date:** [22 November 2010 02:55 UTC](https://rubytalk.org/t/why-i-cant-find-my-ruby/60913/8 "2010-11-22T02:55:16Z")
Again, don't blindly use sudo! This should work just as well, and safer too: cd wget ftp.ruby-lang.org/pub/ruby/1.9/ruby-1.9.2-p0.tar.bz2 tar jxvf ruby-1.9.2-p0.tar.bz2 cd ruby-1.9.2-p0 ./configure --prefix=/usr/local/ruby && make && sudo make install sudo ln -s /usr/local/ruby/bin/ruby /usr/bin/ruby sudo ln -s /usr/local/ruby/bin/gem /usr/bin/gem and since you're making symbolic links to a directory that is already in your PATH, you don't need to edit your PATH in /etc/environment. > **···** > > On Nov 21, 2010, at 17:42 , Pen Ttt wrote: > > > thinks everyone.this right way is : > > sudo wget ftp.ruby-lang.org/pub/ruby/1.9/ruby-1.9.2-p0.tar.bz2 > > sudo tar jxvf ruby-1.9.2-p0.tar.bz2 > > cd /home/pt/ruby-1.9.2-p0 > > sudo ./configure --prefix=/usr/local/ruby > > sudo make > > sudo make install > > sudo ln -s /usr/local/ruby/bin/ruby /usr/bin/ruby > > sudo ln -s /usr/local/ruby/bin/gem /usr/bin/gem > > sudo gedit /etc/environment > > > > PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/ruby/bin" ---
**Author:** ![Tim\_Roberts](https://avatars.discourse-cdn.com/v4/letter/t/e68b1a/32.png) [@Tim\_Roberts](https://rubytalk.org/u/Tim_Roberts)\ **Post date:** [22 November 2010 04:30 UTC](https://rubytalk.org/t/why-i-cant-find-my-ruby/60913/9 "2010-11-22T04:30:20Z")
> thinks everyone.this right way is : > sudo wget ftp.ruby-lang.org/pub/ruby/1.9/ruby-1.9.2-p0.tar.bz2 > sudo tar jxvf ruby-1.9.2-p0.tar.bz2 > cd /home/pt/ruby-1.9.2-p0 > sudo ./configure --prefix=/usr/local/ruby > sudo make > sudo make install > sudo ln -s /usr/local/ruby/bin/ruby /usr/bin/ruby > sudo ln -s /usr/local/ruby/bin/gem /usr/bin/gem > sudo gedit /etc/environment No, it's not. You use sudo only when it is absolutely required, and as with virtually every package you can download, the ONLY step here that needs the sudo is the "make install". You can build it as a normal user. So: wget ftp.ruby-lang.org/pub/ruby/1.9/ruby-1.9.2-p0.tar.bz2 tar jxvf ruby-1.9.2-p0.tar.bz2 cd ruby-1.9.2-p0 ./configure --prefix=/usr/local/ruby make sudo make install > sudo ln -s /usr/local/ruby/bin/ruby /usr/bin/ruby > sudo ln -s /usr/local/ruby/bin/gem /usr/bin/gem > sudo gedit /etc/environment > > PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/ruby/bin" If you are adding /usr/local/ruby/bin to your path, then the two symbolic links are unnecessary. Further, if you want the links in /usr/bin, why not just skip the prefix altogether? > **···** > > Pen Ttt \ wrote: > -- > Tim Roberts, timr@probo.com > Providenza & Boekelheide, Inc. ---
**Author:** ![niklas\_brueckenschla](https://avatars.discourse-cdn.com/v4/letter/n/41988e/32.png) [@niklas\_brueckenschla](https://rubytalk.org/u/niklas_brueckenschla)\ **Post date:** [29 November 2010 12:06 UTC](https://rubytalk.org/t/why-i-cant-find-my-ruby/60913/10 "2010-11-29T12:06:26Z")
typing "irb" & pressing TAB doesn't get you anywhere? > **···** > > On Mon, 2010-11-29 at 21:04 +0900, Pen Ttt wrote: > > > when i installed ruby, > > pt@pt:~$ ruby -v > > ruby 1.9.2p0 (2010-08-18 revision 29036) [i686-linux] > > pt@pt:~$ irb > > The program 'irb' can be found in the following packages: > > \* ruby > > \* irb > > Try: sudo apt-get install \ > > what's wrong? ---
**Author:** ![Lucas\_Nussbaum1](https://avatars.discourse-cdn.com/v4/letter/l/4da419/32.png) [@Lucas\_Nussbaum1](https://rubytalk.org/u/Lucas_Nussbaum1)\ **Post date:** [29 November 2010 12:23 UTC](https://rubytalk.org/t/why-i-cant-find-my-ruby/60913/11 "2010-11-29T12:23:29Z")
How did you install ruby? - Lucas > **···** > > On 29/11/10 at 21:04 +0900, Pen Ttt wrote: > > > when i installed ruby, > > pt@pt:~$ ruby -v > > ruby 1.9.2p0 (2010-08-18 revision 29036) [i686-linux] > > pt@pt:~$ irb > > The program 'irb' can be found in the following packages: > > \* ruby > > \* irb > > Try: sudo apt-get install \ > > what's wrong? ---
**Author:** ![botp1](https://avatars.discourse-cdn.com/v4/letter/b/6de8d8/32.png) [@botp1](https://rubytalk.org/u/botp1)\ **Post date:** [29 November 2010 12:36 UTC](https://rubytalk.org/t/why-i-cant-find-my-ruby/60913/12 "2010-11-29T12:36:35Z")
you only created a link for ruby & gem. you need to create a link for irb too. best regards -botp > **···** > > On Mon, Nov 29, 2010 at 8:04 PM, Pen Ttt \ wrote: > > > when i installed ruby, > > pt@pt:~$ ruby -v > > ruby 1.9.2p0 (2010-08-18 revision 29036) [i686-linux] > > pt@pt:~$ irb > > The program 'irb' can be found in the following packages: > > \* ruby > > \* irb > > Try: sudo apt-get install \ > > what's wrong? ---
**Author:** ![Pen\_Ttt](https://avatars.discourse-cdn.com/v4/letter/p/898d66/32.png) [@Pen\_Ttt](https://rubytalk.org/u/Pen_Ttt)\ **Post date:** [29 November 2010 12:21 UTC](https://rubytalk.org/t/why-i-cant-find-my-ruby/60913/13 "2010-11-29T12:21:46Z")
"irb" +pressing TAB ，nothing happen "irb" +pressing TAB + Space bar pt@pt:~$ irb .bash\_history .local/ .bash\_logout .mozilla/ .bashrc Music/ .cache/ .nautilus/ .compiz/ photo.tar.gz .config/ Pictures/ .dbus/ .pki/ Desktop/ .profile .dmrc Public/ Documents/ .pulse/ Downloads/ .pulse-cookie .emacs.d/ .recently-used.xbel .esd\_auth ruby-1.9.2-p0/ examples.desktop ruby-1.9.2-p0.tar.bz2 .fontconfig/ .shotwell/ .gconf/ .sudo\_as\_admin\_successful .gconfd/ Templates/ .gksu.lock .thumbnails/ .gnome2/ vb .gnome2\_private/ Videos/ .gstreamer-0.10/ .VirtualBox/ .gtk-bookmarks .xinput.d/ .gvfs/ .xsession-errors > **···** > > -- > Posted via [http://www.ruby-forum.com/](http://www.ruby-forum.com/). ---
**Author:** ![Pen\_Ttt](https://avatars.discourse-cdn.com/v4/letter/p/898d66/32.png) [@Pen\_Ttt](https://rubytalk.org/u/Pen_Ttt)\ **Post date:** [29 November 2010 12:31 UTC](https://rubytalk.org/t/why-i-cant-find-my-ruby/60913/14 "2010-11-29T12:31:48Z")
wget [ftp.ruby-lang.org/pub/ruby/1.9/ruby-1.9.2-p0.tar.bz2](http://ftp.ruby-lang.org/pub/ruby/1.9/ruby-1.9.2-p0.tar.bz2) tar jxvf ruby-1.9.2-p0.tar.bz2 cd ruby-1.9.2-p0 sudo ./configure --prefix=/usr/local/ruby sudo make sudo make install > **···** > > -- > Posted via [http://www.ruby-forum.com/](http://www.ruby-forum.com/). ---
**Author:** ![Peter\_Vandenabeele1](https://avatars.discourse-cdn.com/v4/letter/p/59ef9b/32.png) [@Peter\_Vandenabeele1](https://rubytalk.org/u/Peter_Vandenabeele1)\ **Post date:** [29 November 2010 12:37 UTC](https://rubytalk.org/t/why-i-cant-find-my-ruby/60913/15 "2010-11-29T12:37:56Z")
You may try these 3 commands and report the result: $ which ruby $ ls -l `which ruby` $ ls -l `which ruby | sed -e 's/ruby//'` | grep irb In my case, the result is: $ which ruby /usr/bin/ruby $ ls -l `which ruby` lrwxrwxrwx 1 root root 43 2010-05-10 14:47 /usr/bin/ruby -\> /opt/ruby-enterprise-1.8.7-2010.01/bin/ruby $ ls -l `which ruby | sed -e 's/ruby//'` | grep irb lrwxrwxrwx 1 root root 42 2010-05-10 14:48 irb -\> /opt/ruby-enterprise-1.8.7-2010.01/bin/irb -rwxr-xr-x 1 root root 376 2010-03-19 18:45 irb1.8 lrwxrwxrwx 1 root root 6 2010-03-31 17:00 irb-ORIG -\> irb1.8 What it does is: \* use 'which' to find where you have ruby installed \* list the details about ruby (e.g. a symlink) \* search that same directory for the 'irb' command That may give a hint where your ruby and irb are installed. HTH, Peter > **···** > > On Mon, Nov 29, 2010 at 1:21 PM, Pen Ttt \ wrote: > > > "irb" +pressing TAB ，nothing happen > > "irb" +pressing TAB + Space bar > > pt@pt:~$ irb > > .bash\_history .local/ > > .bash\_logout .mozilla/ > > .bashrc Music/ > > .cache/ .nautilus/ > > .compiz/ photo.tar.gz > > .config/ Pictures/ > > .dbus/ .pki/ > > Desktop/ .profile > > .dmrc Public/ > > Documents/ .pulse/ > > Downloads/ .pulse-cookie > > .emacs.d/ .recently-used.xbel > > .esd\_auth ruby-1.9.2-p0/ > > examples.desktop ruby-1.9.2-p0.tar.bz2 > > .fontconfig/ .shotwell/ > > .gconf/ .sudo\_as\_admin\_successful > > .gconfd/ Templates/ > > .gksu.lock .thumbnails/ > > .gnome2/ vb > > .gnome2\_private/ Videos/ > > .gstreamer-0.10/ .VirtualBox/ > > .gtk-bookmarks .xinput.d/ > > .gvfs/ .xsession-errors > > > > -- > > Posted via [http://www.ruby-forum.com/\](http://www.ruby-forum.com/%5C). > > -- > Peter Vandenabeele > gsm: +32-478-27.40.69 > e-mail: peter@vandenabeele.com > [http://twitter.com/peter\_v](http://twitter.com/peter_v) ---
**Author:** ![Lucas\_Nussbaum1](https://avatars.discourse-cdn.com/v4/letter/l/4da419/32.png) [@Lucas\_Nussbaum1](https://rubytalk.org/u/Lucas_Nussbaum1)\ **Post date:** [29 November 2010 14:14 UTC](https://rubytalk.org/t/why-i-cant-find-my-ruby/60913/16 "2010-11-29T14:14:36Z")
Then ruby isn't in your $PATH. Have you tried your distribution's packages? - Lucas > **···** > > On 29/11/10 at 21:31 +0900, Pen Ttt wrote: > > > wget ftp.ruby-lang.org/pub/ruby/1.9/ruby-1.9.2-p0.tar.bz2 > > tar jxvf ruby-1.9.2-p0.tar.bz2 > > cd ruby-1.9.2-p0 > > sudo ./configure --prefix=/usr/local/ruby > > sudo make > > sudo make install ---
**Author:** ![Pen\_Ttt](https://avatars.discourse-cdn.com/v4/letter/p/898d66/32.png) [@Pen\_Ttt](https://rubytalk.org/u/Pen_Ttt)\ **Post date:** [29 November 2010 12:43 UTC](https://rubytalk.org/t/why-i-cant-find-my-ruby/60913/17 "2010-11-29T12:43:18Z")
pt@pt:~$ which ruby /usr/bin/ruby pt@pt:~$ ls -l `which ruby` lrwxrwxrwx 1 root root 24 2010-11-29 16:00 /usr/bin/ruby -\> /usr/local/ruby/bin/ruby pt@pt:~$ ls -l `which ruby | sed -e 's/ruby//'` | grep irb pt@pt:~$ there is nothing for the last command ls -l `which ruby | sed -e 's/ruby//'` | grep irb > **···** > > -- > Posted via [http://www.ruby-forum.com/](http://www.ruby-forum.com/). ---
**Author:** ![Peter\_Vandenabeele1](https://avatars.discourse-cdn.com/v4/letter/p/59ef9b/32.png) [@Peter\_Vandenabeele1](https://rubytalk.org/u/Peter_Vandenabeele1)\ **Post date:** [29 November 2010 12:50 UTC](https://rubytalk.org/t/why-i-cant-find-my-ruby/60913/18 "2010-11-29T12:50:36Z")
(caveat, not actually tried, from memory). So now try: $ cd /usr/bin $ sudo ln -s /usr/local/ruby/bin/irb irb After that, the command: $ ls -l `which ruby | sed -e 's/ruby//'` | grep irb should show the symlink as on my computer. and $ which irb should work. You could also add to your .bashrc a line like: PATH=/usr/local/ruby/bin:"${PATH}" this wlll make all those command in /usr/local/ruby/bin available HTH, Peter > **···** > > On Mon, Nov 29, 2010 at 1:43 PM, Pen Ttt \ wrote: > > > pt@pt:~$ which ruby > > /usr/bin/ruby > > pt@pt:~$ ls -l `which ruby` > > lrwxrwxrwx 1 root root 24 2010-11-29 16:00 /usr/bin/ruby -\> > > /usr/local/ruby/bin/ruby > > pt@pt:~$ ls -l `which ruby | sed -e 's/ruby//'` | grep irb > > pt@pt:~$ > > > > there is nothing for the last command > > ls -l `which ruby | sed -e 's/ruby//'` | grep irb