$ cp todo.txt !#:1.bak
cp todo.txt todo.txt.bak

NOTE: Actually you can use !#:1 in every command 'cause that's last argument passed to a command.

UPDATED: Now it works with zsh

User 1 - 0..1 Laptop

• Model ```ruby a/m/user.rb has_one :laptop

a/m/laptop.rb belongs_to :user, optional: true ```

• spec ruby s/m/laptop_spec.rb it { should belong_to(:user).optional }

Go to your project root and cd into app/models (using CLI obviously) then run wc -lw * | sort -u

$ wc -lw * | sort -u
103     186 deal_broker.rb
116     313 physical_sim_report.rb
126     229 coupon_code.rb
126     260 subscription_mission.rb
129     284 payment.rb
145     290 deal_value.rb
147     255 single_use_coupon.rb
166     344 sim_card.rb
166     406 coupon_campaign.rb
225     451 order_summary.rb
260     534 deal.rb
308     783 package.rb
443    1031 user.rb
728    1744 subscription.rb
7262   15841 total

So now you can see Rocky is all about User ,Subscription and Package.

Note: First column number of lines and the second column number of words.

Generating a rails 6 app with ruby 2.6+ when you have bundler v2 installed creates unusable binstubs. If you are seeing this error You must use Bundler 2 or greater with this lockfile. you can remove the bundler that comes bundled with ruby 2.6 and rely on the manually installed v2 bundler.

If you are using rbenv you can use this command (adjust for your ruby version e.g. 2.6.{0, 1} etc), other installation systems will use different locations

rm -rf ~/.rbenv/versions/2.6.1/lib/ruby/2.6.0/bundler*

Sometimes I want to go back to the last page I viewed while still keeping the same one open. You can very easily achieve this with shortcuts

1. ⌘-L to focus the omnibox
2. ⌘-Enter to open the current URL in a new tab
3. ⌘-⇧-[ to go back to the original tab
4. ⌘-[ to go back to the previously viewed page in the original tab

I often move lines around in vim so I have created mappings to make this easier. These map to ⌘-j for move down and ⌘-k for move up. Works in normal, insert, and visual modes. vim nnoremap :m .+1== nnoremap :m .-2== inoremap :m .+1==gi inoremap :m .-2==gi vnoremap :m '>+1gv=gv vnoremap :m '<-2gv=gv I use MacVim so I have used D(⌘) for the modifier key. To use in terminal based vims, use a different modifier e.g.

$ git branch --merged | egrep -v 'master|develop' | xargs -n 1 git branch -d

You can safelist more branches in egrep -v 'master|develop|foo|bar'

$ git diff origin/master -- [local-path]

Local and Remote Branches

Fetching the latest changes

Using Git Diff to compare files

Best practices for comparing local and remote

• Always fetch the latest changes from the remote repository before comparing local and remote branches.
• Use Git Diff to compare files between local and remote branches.
• Use the --stat option to show a condensed version of the differences.
• Use the git log command to compare commit histories between local and remote branches.
• Use the git status command to see the status of your local branch and the remote branch.
  
  

• Use git difftool to compare files between local and remote branches using a graphical difftool.
• Use git diff --name-only to list the modified files between local and remote branches.
• Use git diff --word-diff to show the differences word by word.
• Use git diff --ignore-space-change to ignore whitespace changes.
  
  

git rebase -p --onto SHA^ SHA

$ RUBYOPT=W0 ./bin/rspec spec/
...

$ RUBYOPT=W0 bundle exec rspec spec/
...

$ RUBYOPT=W0 rspec
...

$ RUBYOPT=W0 ...
...

Suppress Warnings Globally

$VERBOSE = nil

Suppress Specific Warnings

def suppress_warnings 
original_verbose = $VERBOSE 
$VERBOSE = nil 
yield 
ensure 
$VERBOSE = original_verbose 
end 

suppress_warnings do 
require 'some_gem_with_warnings' 
end

Suppress RSpec Warnings

RSpec.configure do |config| 
config.warnings = false 
end

Redirect Deprecation Warnings

RSpec.configure do |config| 
config.deprecation_stream = File.open('log/rspec_deprecations.log', 'w') 
end

Environment-Specific Suppression

$VERBOSE = nil if ENV['SUPPRESS_WARNINGS'] == 'true'