# How to use ri in my computer? **URL:** \ **Category:** Ruby\ **Created:** [April 8, 2010, 12:27pm UTC](https://www.ruby-forum.com/t/how-to-use-ri-in-my-computer/186531 "2010-04-08T12:27:24Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![luofeiyu](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/l/9de0a6/32.png) [@luofeiyu](https://www.ruby-forum.com/u/luofeiyu)\ **Post date:** [April 8, 2010, 12:27pm UTC](https://www.ruby-forum.com/t/how-to-use-ri-in-my-computer/186531/1 "2010-04-08T12:27:24Z")
pt@pt-laptop:~$ ri Integer#times /usr/local/ruby/lib/ruby/1.9.1/rdoc/ri/driver.rb:384:in `initialize': Permission denied - /home/pt/.ri/cache/.doc_dirs (Errno::EACCES) from /usr/local/ruby/lib/ruby/1.9.1/rdoc/ri/driver.rb:384:in`open’ from /usr/local/ruby/lib/ruby/1.9.1/rdoc/ri/driver.rb:384:in `create_class_cache' from /usr/local/ruby/lib/ruby/1.9.1/rdoc/ri/driver.rb:371:in`class\_cache’ from /usr/local/ruby/lib/ruby/1.9.1/rdoc/ri/driver.rb:591:in `block in run' from /usr/local/ruby/lib/ruby/1.9.1/rdoc/ri/driver.rb:590:in`each’ from /usr/local/ruby/lib/ruby/1.9.1/rdoc/ri/driver.rb:590:in `run' from /usr/local/ruby/lib/ruby/1.9.1/rdoc/ri/driver.rb:300:in`run’ from /usr/local/ruby/bin/ri:5:in `’ pt@pt-laptop:~$ sudo ri Integer#times [sudo] password for pt: sudo: ri: command not found pt@pt-laptop:~$ sudo /usr/local/ruby/lib/ruby/1.9.1/rdoc/ri Integer#times sudo: /usr/local/ruby/lib/ruby/1.9.1/rdoc/ri: command not found pt@pt-laptop:~$ cd /usr/local/ruby/lib/ruby/1.9.1/rdoc/ri pt@pt-laptop:/usr/local/ruby/lib/ruby/1.9.1/rdoc/ri$ ls cache.rb display.rb formatter.rb reader.rb writer.rb descriptions.rb driver.rb paths.rb util.rb pt@pt-laptop:/usr/local/ruby/lib/ruby/1.9.1/rdoc/ri$ why can’t i use my ri?how can i do? ---
**Author:** ![luofeiyu](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/l/9de0a6/32.png) [@luofeiyu](https://www.ruby-forum.com/u/luofeiyu)\ **Post date:** [April 8, 2010, 12:35pm UTC](https://www.ruby-forum.com/t/how-to-use-ri-in-my-computer/186531/2 "2010-04-08T12:35:55Z")
Hello Pen, 2010/4/8 Pen T. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid): > pt@pt-laptop:~$ ri Integer#times > /usr/local/ruby/lib/ruby/1.9.1/rdoc/ri/driver.rb:384:in `initialize’: > Permission denied - /home/pt/.ri/cache/.doc\_dirs (Errno::EACCES) It seems that there are some directory you can’t read in ~/.ri. Try sudo chown -R pt home/pt/.ri to recursively regain access to the directories, it should solve at least this issue. Cheers, ---
**Author:** ![luofeiyu](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/l/9de0a6/32.png) [@luofeiyu](https://www.ruby-forum.com/u/luofeiyu)\ **Post date:** [April 8, 2010, 3:30pm UTC](https://www.ruby-forum.com/t/how-to-use-ri-in-my-computer/186531/3 "2010-04-08T15:30:00Z")
sudo find / -name ‘ri’ the following is what i get /usr/local/ruby/lib/ruby/1.9.1/rdoc/ri /usr/local/ruby/lib/ruby/gems/1.9.1/doc/hpricot-0.8.2/ri /usr/local/ruby/lib/ruby/gems/1.9.1/doc/rubygems-update-1.3.6/ri /usr/local/ruby/lib/ruby/gems/1.9.1/doc/fastri-0.3.1.1/ri /usr/local/ruby/lib/ruby/gems/1.9.1/doc/rubygems-1.3.6/ri /usr/local/ruby/lib/ruby/gems/1.9.1/doc/nokogiri-1.4.1/ri /usr/local/ruby/lib/ruby/gems/1.9.1/doc/fastercsv-1.5.3/ri /usr/local/ruby/share/ri /usr/local/ruby/bin/ri /home/pt/ruby-1.9.1-p378/lib/rdoc/ri /home/pt/ruby-1.9.1-p378/bin/ri /home/pt/.gem/ruby/1.9.1/doc/mailfactory-1.4.0/ri /home/pt/.gem/ruby/1.9.1/doc/ruport-util-0.14.0/ri /home/pt/.gem/ruby/1.9.1/doc/mime-types-1.16/ri /etc/bash\_completion.d/ri how can i do? ---
**Author:** ![luofeiyu](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/l/9de0a6/32.png) [@luofeiyu](https://www.ruby-forum.com/u/luofeiyu)\ **Post date:** [April 9, 2010, 3:43pm UTC](https://www.ruby-forum.com/t/how-to-use-ri-in-my-computer/186531/4 "2010-04-09T15:43:53Z")
pt@pt-laptop:~$ ls -la /home/pt/.ri total 20 drwxr-xr-x 3 root root 4096 2010-03-24 18:35 . drwxr-xr-x 162 pt pt 12288 2010-04-09 21:40 … drwxr-xr-x 2 root root 4096 2010-03-24 18:35 cache pt@pt-laptop:~$ sudo chown -R pt home/pt/.ri [sudo] password for pt: chown: cannot access `home/pt/.ri’: No such file or directory pt@pt-laptop:~$ how can i do?help me, think you ---
**Author:** ![luofeiyu](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/l/9de0a6/32.png) [@luofeiyu](https://www.ruby-forum.com/u/luofeiyu)\ **Post date:** [April 8, 2010, 4:11pm UTC](https://www.ruby-forum.com/t/how-to-use-ri-in-my-computer/186531/5 "2010-04-08T16:11:26Z")
Hello Pen, 2010/4/8 Pen T. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid): > sudo find / -name ‘ri’ The directory ‘ri’ is looking for is not called ‘ri’ but ‘.ri’ (note the dot at the beginnining of the name that make the directory ‘invisible’ from a simple ‘ls’). Try ls -la /home/pt/.ri to look at it directly. What did the command sudo chown -R pt home/pt/.ri answer to you ? Cheers, ---
**Author:** ![luofeiyu](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/l/9de0a6/32.png) [@luofeiyu](https://www.ruby-forum.com/u/luofeiyu)\ **Post date:** [April 9, 2010, 3:52pm UTC](https://www.ruby-forum.com/t/how-to-use-ri-in-my-computer/186531/6 "2010-04-09T15:52:30Z")
2010/4/9 Pen T. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid): > pt@pt-laptop:~$ ls -la /home/pt/.ri > total 20 > drwxr-xr-x 3 root root 4096 2010-03-24 18:35 . > drwxr-xr-x 162 pt pt 12288 2010-04-09 21:40 … > drwxr-xr-x 2 root root 4096 2010-03-24 18:35 cache > pt@pt-laptop:~$ sudo chown -R pt home/pt/.ri > [sudo] password for pt: > chown: cannot access `home/pt/.ri’: No such file or directory > pt@pt-laptop:~$ Sorry, typo on my side. It should be read sudo chown -R pt /home/pt/.ri (forgot the root slash). That should work now. Cheers, ---
**Author:** ![luofeiyu](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/l/9de0a6/32.png) [@luofeiyu](https://www.ruby-forum.com/u/luofeiyu)\ **Post date:** [April 10, 2010, 4:35am UTC](https://www.ruby-forum.com/t/how-to-use-ri-in-my-computer/186531/7 "2010-04-10T04:35:17Z")
it’s ok nox ,think you