Keeping the environment updated

Use with caution, anyway.

rvm get latest --auto
rvm install 1.9.3
gem update --system # 1.3.7 # that's it for downgrading

gem update bundler  # which I actually keep in my Gemfile
bundle update

Useful Shell commands in Linux (terminal)

find . -name file_name # path first option without equal
grep -rn string . --context=5      # path last

# count the lines of ruby
( find ./ -name '*.rb' -print0 | xargs -0 cat ) | wc -l

rails -e production
rake x:y x:z RAILS_ENV=test # chain tasks and env is loaded only once
rails c production --sandbox 
rails dbconsole -p'whatever'
tailf log/development.log | grep -v ECONNREFUSED -E 'Processing|Render|Parameters' # show actions and templates only
ssh user@host 'ls -l'
scp -C user@host /tmp/db.sql /tmp/db.sql # -C will compress the data over the wire
curl -Lk --user user:pwd --data "param1=value1&param2=value2" http://url
service --status-all
netstat -an | grep "LISTEN " # check the open ports
free -m # check the ram
df -H   # check the disk
curl --user usr:pwd -Lkv --data "param1=value1&param2=value2" www.url.com/post_here
scp -C urs@url:/origin/ destination/ 

ncdu / # disk usage

Git cheatsheet

# Search for a word in log diff
git log -S"def email_required"

# display branches in activity order
git for-each-ref --sort=-committerdate --format='%(committerdate:short) %(refname)' refs/heads refs/remotes 

# checkout previous branch
git checkout -
git checkout @{-1}
# get rid of the latest changes and restore to the sha
git checkout sha1

# undo latest pull
git reset HEAD@{1}
git checkout .

# discard conflicting changes in a dir (after merge)
git co --theirs dir/ # discard their changes
git co --ours dir/   # discard our changes

# stash
git stash save "name of the stash"
git stash apply
git stash help

# checkout a new branch from origin
git checkout -b new origin/new

# tags
git tag "tag-name"
git push --tags

# bisect for debugging
git bisect start
git bisect bad
git co 32c4bf6 # (known good sha)
git bisect good

# create a patch
git format-patch -1 sha1
# and to apply it
git am 0001-commit-name.patch 

# ignore a committed file
# add the file to .gitignore
git rm --cache your_file

# ignore the repo
git update-index --assume-unchanged .ruby-version

# delete a remote branch
git push origin --delete branch_name

# rename a branch
git branch -m old_name new_name

# all your commits on any branch in the last x months
git log --pretty=format:"%ad:%h:%B" --date=short --reverse --all --author=erik  --since=1.day.ago

# count the lines of code of your app
git ls-files app/ | xargs wc -l

# undo a merge that was already pushed:
git revert -m 1 merge_hash
#
#

Here great post on git tips .gitignore_global (add .rbenv-gemsets)

Here's my git config

Git style guide

Best practices 

A Ruby on Rails developer environment

Ryan Bigg's explains how to install Rails, I trust him
Then you'll need postgres

echo "-d=postgresql --skip-bundle -T" > ~/.railsrc
# $ rvm gemset create opera_wbe
# $ gem install bundler --no-rdoc --no-ri

NOTE: the `-T` option will change the `config/application.rb` as this following top group instead of loading `rails/all` (very nice!):

# Pick the frameworks you want:
require "active_record/railtie"
require "action_controller/railtie"
require "action_mailer/railtie"
require "active_resource/railtie"
require "sprockets/railtie"
# require "rails/test_unit/railtie"

module OperaWbe
  class Application < Rails::Application
    # migration with numbers (001, 002, ...) in stead of timestamp
    config.active_record.timestamped_migrations = false

    # in production actually
    # prepend assets path
    # config.action_controller.asset_host = ASSETS_PATH

    # in development actually
    # Remove assets logging
    config.assets.logger = false # ~only~ one line each asset request

# [...]

Also I find the following files very useful

~/.irbrc                     # with global functions to call in the console
~/workspace/.rvmrc           # which loads my @new gemset
~/workspace/every_app/.rvmrc # with the following...

rvm ruby-1.9.2-p290@new # with bundler and rails only
rvm gemdir              # show the gemdir everytime you change project

# .irbrc
puts 'Using irb console helper functions from ~/.irbrc'

# returns the list of methods not inherited from Object
# it will not show methods overwritten from `Object.new`
# eg: `y ml String.new`
def ml(object)
  (String.public_methods - object.methods).sort
end

Then my prompt looks like this:

21:43:02-6950 - ~/workspace> cat ~/.bashrc
[...]
 # some more ls aliases
 alias ll='ls -l'
 alias la='ls -A'
        alias lo='ls -o'


# colorful, with time, history id and path (also in window title)
# export PS1="\[\e]0;\w\a\]\e[1;36m\t-\! - \w>\e[m "
export PS1="\[\e]0;\w\a\e[1;36m\]\t-\! - \w>\[\e[m\] "
# TODO: git branch in prompt


# ror workspace available everywhere
export CDPATH=$CDPATH':/home/erik/workspace/'

## big bash history
export HISTSIZE=20000
# append all commands to the history file, don't overwrite it at the start of every new session
shopt -s histappend

[[ -s "$HOME/.rvm/scripts/rvm" ]] && . "$HOME/.rvm/scripts/rvm"  # This loads RVM into a shell session.
cd .

And yes, I know, at the moment without without the git branch, it's messing with the color.

echo 'gem: --no-ri --no-rdoc' >~/.gemrc # never install gem doc

A couple of config for git, get the book here

[color]
 diff = true
 status = true
 branch = true

[alias]
 co = checkout

Setup Sublime Text and customize it as such