IanVaughan

#!/usr/bin/env bash

uninstall() {
  list=`gem list --no-versions`
  for gem in $list; do
    gem uninstall $gem -aIx
  done
  gem list
  gem install bundler
}

skyriverbend

#!/usr/local/bin/python
"""
To use this script, you must be in the root directory of a Rails project that
is using git. You should also make sure that your directory does not contain any
uncommitted changes. Then run:

    $ python rails_switch_branch.py name_of_another_branch

Running the above will do the following:

dergachev

OS X Screencast to animated GIF

This gist shows how to create a GIF screencast using only free OS X tools: QuickTime, ffmpeg, and gifsicle.

Instructions

To capture the video (filesize: 19MB), using the free "QuickTime Player" application:

kevin-smets

Default

Powerlevel10k

Kartones

PSQL

Magic words:

psql -U postgres

Some interesting flags (to see all, use -h or --help depending on your psql version):

• -E: will describe the underlaying queries of the \ commands (cool for learning!)
• -l: psql will list all databases and then exit (useful if the user you connect with doesn't has a default database, like at AWS RDS)

Decoherence

import Data.ByteString.Lazy.Internal
import Data.Aeson
import Control.Applicative

data Person = Person String Int deriving (Show) 

instance FromJSON Person where
  parseJSON (Object p) =
    Person <$> 
      (p .: "name") <*> 

Decoherence

-- | Main entry point to the application.
module Main where

import Control.Monad.Reader
import Control.Monad.Writer

{- 
    The ReaderT transformer is used to retrieve a read-only value from some environment. 
    The WriterT transformer will log the result of each retrieval. 
    Running the two transformers together yields a log of each step along with the actual results.

bcremer

systemd for Administrators

Chronological list of the "systemd for Administrators" series published on 0pointer.net/blog:

• Part I: Verifying Bootup
• Part II: Which Service Owns Which Processes?
• Part III: How Do I Convert A SysV Init Script Into A systemd Service File?
• Part IV: Killing Services
• Part V: The Three Levels of "Off"
• Part VI: Changing Roots

Decoherence

{-# LANGUAGE DeriveGeneric   #-}
{-# LANGUAGE TemplateHaskell #-}
import           Control.Lens
import           Data.Aeson
import qualified Data.ByteString.Lazy.Char8 as C
import           GHC.Generics

-- For production code, use Text instead of String
data Person = Person { _personName :: String
                     , _personAge  :: Int

Decoherence

import           Control.Applicative
import           Control.Monad
import           Options
import           Safe


{-
  Command-line arguments:
    -m: biggest prime less than m   (required)
    -l: show full list              (optional)