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if [[ $EUID -ne 0 ]]; then
    echo "This script must be run as root. Exiting"
    exit 1
fi

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Windows PowerShell

Network wake on lan packet http://www.adminarsenal.com/admin-arsenal-blog/powershell-sending-a-wake-on-lan-wol-magic-packet/

System.Net.WebRequest -

$req = [System.Net.WebRequest]::Create('http://www.devdungeon.com') $req.Method ="GET" $req.ContentLength = 0

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nasm Net Assembler Assembly

Compile and link

Compile with:

nasm -f elf64 file.asm
# or -f elf for 32 bit

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Sample MongoDB commands

show dbs
use <db>  # also creates
show collections
db.getCollectionNames()
db.showCollections()
db.domains.getIndexes()
db.domains.stats()

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Dart Language Basics

Build from source

Follow the instructions on https://github.com/dart-lang/sdk/wiki/Building

Then run:

sudo apt-get install g++-multilib git python curl

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Crystal

https://crystal-lang.org is just like Ruby, but it compiles and has threads.

Install

Download the .tar.gz from https://github.com/crystal-lang/crystal/releases/ Extract and add bin/ to PATH. Adds crystal and shards to PATH.

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Clojure Basics

Install Java from https://www.java.com/en/download/ Download lein or lein.bat from http://leiningen.org/

lein self-install
lein new <project>
cd <project>
vim project.clj # and add the following:

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Using Amazon Web Services command line interface

python3 -m pip install awscli python3 -m awscli configure # Get key from IAM

https://docs.aws.amazon.com/cli/latest/reference/

Copy file to s3

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# local_play.yaml
- name: Local play
  hosts: localhost
  connection: local
  tasks:
  - name: Create a text file
    command: touch test.txt
  - name: Rename the file
    command: mv test.txt test.md

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# See which packages take up the most space
rpm -qa --queryformat '%10{size} - %-25{name} \t %{version}\n' | sort -n

# or simply
rpm -qa --queryformat '%{size} %{name}\n' | sort -n