donigian

To set up a new Chef workstation:
+ download vagrant
+ download virtualbox
+ vagrant box add precise64
+ vagrant plugin install vagrant-berkshelf
+ vagrant plugin install vagrant-omnibus
+ git clone [email protected]:gpn-dev/chef-repo.git
+ vagrant up

vagrant up

donigian

For example, if your commit history is A-B-C-D-E-F with F as HEAD, and you want to change the author of C and D, then you would...

Specify git rebase -i B
change the lines for both C and D to edit
Once the rebase started, it would first pause at C
You would git commit --amend --author="Author Name <[email protected]>"
Then git rebase --continue
It would pause again at D
Then you would git commit --amend --author="Author Name <[email protected]>" again
git rebase --continue

donigian

✗ knife bootstrap localhost \
 --ssh-user vagrant \
 --ssh-password vagrant \
 --ssh-port 2222 \
 --run-list "recipe[apt]" \
 --sudo 
Bootstrapping Chef on localhost
localhost --2013-12-19 21:47:47--  https://www.opscode.com/chef/install.sh
localhost Resolving www.opscode.com (www.opscode.com)... 184.106.28.91
localhost Connecting to www.opscode.com (www.opscode.com)|184.106.28.91|:443... connected.

donigian

#!/bin/bash
 
set -o errexit
set -o nounset
 
if [[ ${#} -ne 1 ]]
then
  echo "Usage: ${0} upstart-conf-file" >&2
  exit 1
fi

donigian

scala> callByValue(printFoo())
Func Foo invoked
a1="a1"
a2="a2"

scala> callByName(printFoo())
Func Foo invoked
b1="b1"
Func Foo invoked
b2="b2"

donigian

def printFoo() = {
  println("Func Foo invoked")
}

def callByValue(a: String) = {
  println("a1=" + a)
  println("a2=" + a)
}

def callByName(b: => String) = {

donigian

function mk-scala-dir() {
  mkdir -p src/main/{resources,scala}
  mkdir -p test/{resources,scala}
  mkdir -p project/
  touch build.sbt
  printf 'name := "sample"\n\n' >> build.sbt
  printf 'version := "0.0.1"\n\n' >>build.sbt
  printf 'scalaVersion := "2.10.0"\n' >> build.sbt

  touch project/build.properties

donigian

rmongodb Example

library(rmongodb)
mg2 <- mongo.create()
print(mongo.get.databases(mg2))
print(mongo.get.database.collections(mg2, 'db'))
buf <- mongo.bson.buffer.create()
mongo.bson.buffer.start.object(buf, 'AGE')
mongo.bson.buffer.append(buf, '$lt', 10)
mongo.bson.buffer.finish.object(buf)

donigian

$ git checkout master && git pull 
$ git checkout -b topic
-> Work a bit and commit changes
-> Preview changes from master
$ git checkout master # Think about checking out branch performing action to
$ git pull
$ git checkout topic
$ git rebase master
-> When unit & integration tests pass
$ git checkout master

donigian

sudo service postgresql restart 
sudo service postgresql status
sudo service postgresql stop 
sudo service postgresql status
sudo crontab -l

tail -f  /var/log/postgresql/postgresql-9.1-main.log

/etc/services