Skip to main content

RVM basic commands

RVM basic commands

rvm install, rvm uninstall, rvm use, rvm list, rvm upgrade, rvm get stable, rvm gemset like commands will be illustrated.

Listing down RVM basic commands that are used,
1. Install Specific Ruby Version:

$ rvm install 1.9.2

Above command will install latest stable public release for that specific version. Here, for ruby 1.9.2
2. Uninstall Specific Ruby Version:

$ rvm uninstall 1.9.2

Above command will uninstall the specified version installed on your machine.
3. List Ruby Versions

$ rvm list

rvm rubies

   ruby-1.9.2-p320 [ x86_64 ]
   ruby-1.9.3-p448 [ x86_64 ]
=* ruby-2.0.0-p247 [ x86_64 ] ruby-2.0.0-p353
   [ x86_64 ]

# => - current
# =* - current && default
# * - default

This will list all the Ruby Versions installed on your machine. Sample output is also shown in the code area. It also explains about the current Ruby version in use and the default version configured for your machine in RVM.
4. RVM Use

$ rvm use 1.9.2

Above command will set Ruby version 1.9.2 as the current version to be used for Ruby code interpretation.

rvm use 1.9.2 --default

Above command will set 1.9.2 as the default version of Ruby to be used for Ruby code interpretation.
5. RVM gemset

$ rvm gemset action

Refer what is gemset for more. This command should be used to operate various gemset related operations.
6. RVM update to stable version:

$ rvm get stable

This command will update your RVM with the latest stable version of RVM. It will require internet connection.
7. RVM Upgrade

$ rvm upgrade 2.0.0

This command will upgrade the Ruby installed on your machine with new Ruby version. Example, suppose you have Ruby version 1.9.2 installed on your machine and then you try rvm upgrade 2.0.0 command - Then rvm will upgrade ruby version 1.9.2 directly to 2.0.0
8. RVM Requirements

$ rvm requirements

Checking requirements for osx. Certificates in '/usr/local/etc/openssl/cert.pem' already are up to date. Requirements installation successful.
RVM own have some dependency over some GNU Tools that it used for performing various operations. This command will check for those requirements and install if not already installed. Sample output of this command is also shown in the code area.
9. Installing JRuby

$ rvm install jruby-1.7.9

This command will install JRuby on your machine. And then if you try rvm jruby then it will list down the version of JRuby installed on your machine.
10. RVM Disk-Usages

$ rvm disk-usage

Downloaded Archives Usage: 42M Repositories Usage: 0B Extracted Source Code Usage: 547M Log Files Usage: 1.1M Packages Usage: 0B Rubies Usage: 349M Gemsets Usage: 1.7G Wrappers Usage: 48K Temporary Files Usage: 0B Other Files Usage: 4.5M Total Disk Usage: 2.7G
This command will give statistics of how rvm using disk for what features. Sample output explains itself.
11. RVM Repair

$ rvm repair

This command lets you to repair environment. It checks if your RVM has some problems regarding configurations and tries to fix it.
12. RVM Help

$ rvm help

This command should be used to get full list of all commands that can be used with RVM. You will get help for all the RVM commands. Conclusion: RVM is powerful to manage ruby on your machine of which we discussed about RVM basic commands. For more you can refer RVM here.


Popular posts from this blog

Gem::LoadError (Specified 'mysql2' for database adapter, but the gem is not loaded. Add `gem 'mysql2'` to your Gemfile (and ensure its version is at the minimum required by ActiveRecord).?

Gem::LoadError (Specified 'mysql2' for database adapter, but the gem is not loaded. Add `gem 'mysql2'` to your Gemfile (and ensure its version is at the minimum required by ActiveRecord).) In rails?

1)change the gemfile in mysql version
 gem 'mysql2'

2)Change to mysql2 version
 gem 'mysql2','0.3.20'

Active Scaffold : Add radio buttons to your form ruby on rails ?

Active Scaffold : Add radio buttons to your form ruby on rails ?

The way to add radio buttons to your active scaffold create/update from is as shown below


class UsersController < ApplicationController
active_scaffold :user do |config|
config.label = “Users”
config.columns = [:name, :gender]
config.columns[:gender].form_ui = :radio
config.columns[:gender].options[:options] = [['Male', '1'], ['Female','2']]

Get the Current url in ruby on rails

request.refererrequest.fullpathrequest.fullpath.split("?")[0]request.referer or request.env['HTTP_REFERER'] your controller to get the referer url. 

<link rel="canonical" href="<%= request.url %>" />
How can I get the current absolute URL in my Ruby on Rails view?
The request.request_uri only returns the relative URL.

 For Rails 3.2 or Rails 4 you should use request.original_url to get the current URL. More detail.

For Rails 3: You want "#{request.protocol}#{request.host_with_port}#{request.fullpath}", since request.url is now deprecated.

For Rails 2: You want request.url instead of request.request_uri. This combines the protocol (usually http://) with the host, and request_uri to give you the full address