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@encoreshao
encoreshao / psql-with-gzip-cheatsheet.sh
Created December 22, 2021 03:32 — forked from brock/psql-with-gzip-cheatsheet.sh
Exporting and Importing Postgres Databases using gzip
# This is just a cheat sheet:
# On production
sudo -u postgres pg_dump database | gzip -9 > database.sql.gz
# On local
scp -C production:~/database.sql.gz
dropdb database && createdb database
gunzip < database.sql.gz | psql database
@encoreshao
encoreshao / resize_nocrop_noscale
Created June 11, 2020 03:06 — forked from maxivak/resize_nocrop_noscale
Crop and resize an image using MiniMagick in Ruby on Rails. Two approaches.
def resize_nocrop_noscale(image, w,h)
w_original = image[:width].to_f
h_original = image[:height].to_f
if w_original < w && h_original < h
return image
end
# resize
image.resize("#{w}x#{h}")
@encoreshao
encoreshao / tmux-cheatsheet.markdown
Created July 5, 2019 07:31 — forked from MohamedAlaa/tmux-cheatsheet.markdown
tmux shortcuts & cheatsheet

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname
@encoreshao
encoreshao / read-access.sql
Created March 13, 2019 03:32 — forked from oinopion/read-access.sql
How to create read only user in PostgreSQL
-- Create a group
CREATE ROLE readaccess;
-- Grant access to existing tables
GRANT USAGE ON SCHEMA public TO readaccess;
GRANT SELECT ON ALL TABLES IN SCHEMA public TO readaccess;
-- Grant access to future tables
ALTER DEFAULT PRIVILEGES IN SCHEMA public GRANT SELECT ON TABLES TO readaccess;
@encoreshao
encoreshao / postgres_queries_and_commands.sql
Created August 31, 2018 05:49 — forked from rgreenjr/postgres_queries_and_commands.sql
Useful PostgreSQL Queries and Commands
-- show running queries (pre 9.2)
SELECT procpid, age(clock_timestamp(), query_start), usename, current_query
FROM pg_stat_activity
WHERE current_query != '<IDLE>' AND current_query NOT ILIKE '%pg_stat_activity%'
ORDER BY query_start desc;
-- show running queries (9.2)
SELECT pid, age(clock_timestamp(), query_start), usename, query
FROM pg_stat_activity
WHERE query != '<IDLE>' AND query NOT ILIKE '%pg_stat_activity%'
@encoreshao
encoreshao / rubocop_pre_commit_hook
Created July 22, 2018 11:47 — forked from mpeteuil/rubocop_pre_commit_hook
Ruby style guide git pre-commit hook using Rubocop as the style guide checker. Only runs on staged ruby files that have been added and/or modified.
#!/usr/bin/env ruby
require 'english'
require 'rubocop'
ADDED_OR_MODIFIED = /A|AM|^M/.freeze
changed_files = `git status --porcelain`.split(/\n/).
select { |file_name_with_status|
file_name_with_status =~ ADDED_OR_MODIFIED
@encoreshao
encoreshao / .vimrc
Created May 12, 2018 15:36 — forked from millermedeiros/.vimrc
My VIM settings (.vimrc)
" =============================================================================
" Miller Medeiros .vimrc file
" -----------------------------------------------------------------------------
" heavily inspired by: @factorylabs, @scrooloose, @nvie, @gf3, @bit-theory.
" =============================================================================
" -----------------------------------------------------------------------------
" BEHAVIOR
" -----------------------------------------------------------------------------
@encoreshao
encoreshao / linux_fun.md
Created November 30, 2017 18:26 — forked from marianposaceanu/linux_fun.md
How to have some fun using the terminal.

Linux fun-o-matic

How to have some fun using the terminal.

  1. Install cowsay [0] via : sudo apt-get install cowsay
  2. Install fortune [1] via : sudo apt-get install fortune
  3. Make sure you have Ruby installed via : ruby -v
  4. Install the lolcat [2] via : gem gem install lolcat
  5. Profit!
@encoreshao
encoreshao / deploy_rails_app_on_ubuntu.md
Last active August 29, 2015 14:26 — forked from davidguttman/deploy_rails_app_on_ubuntu.md
Setup Rails application production environment on Ubuntu

Setup Rails application production environment on Ubuntu

Add deploy user

ssh root@YOURDOMAIN
adduser deploy
visudo # Add deploy ALL=(ALL) ALL

Install necessary libraries

@encoreshao
encoreshao / README.rd
Last active August 29, 2015 14:05 — forked from jterrace/xvfb
Linux xvfb
### Step 1: Install xvfb
> # apt-get install xvfb
### Step 2: Create and enable the init script for the xvfb daemon
Note “:0″ in XVFBARGS which sets to display 0, and the –set-guid parameter, which runs the daemon as the www-data user. If you are not running a headless server, make sure to change all references to “:0″ to “:#” (ie: :1, :2 or :22) to avoid conflicts with your existing X session(s)
Move xvfb_v2 to in “/etc/init.d/xvfb”: