P7h

tmux vs. screen commands

---

Action	tmux	screen
start a new session	tmux tmux new tmux new-session	screen
start a new session with a name	tmux new -s name	screen -S name
re-attach a detached session	tmux attach tmux attach-session	screen -r
re-attach a detached session with a name	tmux attach -t name tmux a -t name	screen -r name
re-attach an attached session (detaching it from elsewhere)	tmux attach -dtmux attach-session -d	screen -dr

P7h

-server
-Xms2048m
-Xmx2048m
-XX:NewSize=512m
-XX:MaxNewSize=512m
-XX:PermSize=512m
-XX:MaxPermSize=512m
-XX:+UseParNewGC
-XX:ParallelGCThreads=4
-XX:MaxTenuringThreshold=1

P7h

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### Shell script to download Oracle JDK / JRE / Java binaries from Oracle website using terminal / command / shell prompt using wget.
### You can download all the binaries one-shot by just giving the BASE_URL.
### Script might be useful if you need Oracle JDK on Amazon EC2 env.
### Script is updated for every JDK release.

### Features:-
# 1. Resumes a broken / interrupted [previous] download, if any.
# 2. Renames the file to a proper name with including platform info.

P7h

# Steps to build and install tmux from source.
# Takes < 25 seconds on EC2 env [even on a low-end config instance].

VERSION=2.7
sudo yum -y remove tmux
sudo yum -y install wget tar libevent-devel ncurses-devel
wget https://github.com/tmux/tmux/releases/download/${VERSION}/tmux-${VERSION}.tar.gz
tar xzf tmux-${VERSION}.tar.gz
rm -f tmux-${VERSION}.tar.gz
cd tmux-${VERSION}

P7h

Steps to install 7zip on Linux » Ubuntu and Fedora or CentOS / RHEL

Ubuntu

cat /etc/*release
sudo apt-get update -yqq
sudo apt-get install -yqq p7zip-full

P7h

# Commands to download JDK from shell.
# Not maintaining this anymore. Please check: https://gist.github.com/P7h/9741922

# http://stackoverflow.com/questions/10268583 
# wget --no-check-certificate --no-cookies - --header "Cookie: oraclelicense=accept-securebackup-cookie" http://download.oracle.com/otn-pub/java/jdk/7u51-b13/jdk-7u51-linux-x64.tar.gz

##### ##### ##### ##### ##### ##### ##### ##### ##### ##### ##### ##### ##### ##### ##### ##### ##### ##### ##### ##### #####

#JDK8u25
BASE_URL=http://download.oracle.com/otn-pub/java/jdk/8u25-b17/jdk-8u25

P7h

Lifecycle Phase		Description
validate		Validates whether project is correct and all necessary information is available to complete the build process.
initialize		Initializes build state, for example set properties
generate-sources		Generate any source code to be included in compilation phase.
process-sources		Process the source code, for example, filter any value.
generate-resources		Generate resources to be included in the package.
process-resources		Copy and process the resources into the destination directory, ready for packaging phase.
compile		Compile the source code of the project.
process-classes		Post-process the generated files from compilation, for example to do bytecode enhancement/optimization on Java classes.
generate-test-sources		Generate any test source code to be included in compilation phase.

P7h

import java.util.Random;
import java.util.concurrent.TimeUnit;

import com.google.common.base.Stopwatch;

/**
 * Sample example demonstrating usage of Stopwatch API of Google Guava.
 *
 * @see <a href="http://docs.guava-libraries.googlecode.com/git/javadoc/com/google/common/base/Stopwatch.html">Guava Stopwatch</a>
 */

P7h

Bash command line Shortcuts

Picked these from here

Command Editing Shortcuts

Command	Note
Ctrl + a	go to the start of the command line
Ctrl + e	go to the end of the command line
Ctrl + k	delete from cursor to the end of the command line

P7h

in a nutshell: fit trainingData (train a model), transform testData (predict with model)

• Transformer: DataFrame => DataFrame
• Estimator: DataFrame => Transformer

#Transformers

• Tokenizer: sentence => words
• RegexTokenizer: sentence => words - setPattern
• HashingTF: terms => feature vectors based on frequency - setNumFeatures