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# Backup database to .sql file:
pg_dump -U admin -h localhost -W --no-owner omh > dump201408191629.sql

# Restore database from .sql file:
psql -U postgres -d omh_development -W -h localhost < ~/dump201410131620.sql



# Description of flags:
# -U username of database user

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rsync -avz remote_username@remote_ip_or_doman_name:/path/to/remote/file  /path/to/local/folder

# Example to copy production.log from remote user's folder to local home folder:

rsync -avz [email protected]:~/production.log  ~/


# Options:
# -a archive mode
# -v increase verbosity

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class User < ActiveRecord::Base
  alias :devise_valid_password? :valid_password?

  def valid_password?(password)
    begin
      devise_valid_password?(password)
    rescue BCrypt::Errors::InvalidHash
      return false unless Digest::SHA1.hexdigest(password) == encrypted_password
      logger.info "User #{email} is using the old password hashing method, updating attribute."
      self.password = password

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Инсталација Рубија и Реилс окружења на Убунту

Пре инсталације Рубија:
sudo apt-get install build-essential openssl libreadline6 libreadline6-dev \
curl git-core zlib1g zlib1g-dev libssl-dev libyaml-dev libsqlite3-dev sqlite3 \
libxml2-dev libxslt-dev autoconf libc6-dev ncurses-dev automake libtool bison  \
subversion g++-4.7 libmagickwand-dev

Инсталација g++-4.7
Уколико на званичним серверима дистрибуције не постоји g++-4.7 онда је потребно додати неки сервер у коме се он налази. На пример:

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Додавање корисника jerry у постојећу групу ftp:
usermod -a -G ftp jerry

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-- To mark database 'applogs' as not accepting new connections:

update pg_database set datallowconn = false where datname = 'TARGET_DB';


/* Query pg_stat_activity and get the pid values you want to kill,
then issue SELECT pg_terminate_backend(pid int) to them. */

SELECT pg_terminate_backend(pg_stat_activity.pid)
FROM pg_stat_activity

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# To restart nginx type:
nginx -t reload

# For more options:
# http://www.rootr.net/man/man/nginx/8

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gitk -L36,36:app/models/user.rb

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# Add row to /etc/hosts
# Format is:
# ipaddress hostname
# Example:
16.18.11.156 www.google.com

# This way whenever you type www.google.com it go to 16.18.11.156 

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http://jafty.com/blog/restoring-postgresql-database-with-pg_restore/