jimyang2008

#!/bin/bash

err() {
  echo "ERROR: $@" >&2
}

cf_api() {
  action=$1; shift
  context=$1; shift
  curl -Lks --request $action \

jimyang2008

Node JS characteristics

Functional programming

Asynchronous programming

Tasks can be executed asynchronously only if NO dependency.

With dependency, there will be a producer and a consumer. Consumer need to process result provided by producer.

jimyang2008

Keep everybody on a same page

Maintain an up-to-date published document to make it clear to everybody. It helps to make things clear among different groups. It provides information visibility to everybody.

Writing down things rather than remember

Keep a record of daily activities, gained information, tips, etc. It helps to review and get things connected.

jimyang2008

#!/bin/bash

err() {
    msg="$@"
    echo "ERROR: $msg" >&2
}

[[ `id -u` == '0' ]] || {
    err "must run as root or with sudo"
    exit 1

jimyang2008

#!/bin/bash

set +e

CMD=${0##*/}
CMDDIR=$(cd ${0%/*}>/dev/null; pwd -P)
STOREPASS='changeit'
OPENSSL=openssl

jimyang2008

#!/bin/bash

INSTALL_DIR=~/opt/python 
TMP_DIR=/tmp/install_python
mkdir -p $INSTALL_DIR

DIR_OPENSSL=openssl-1.0.2k
DIR_PYTHON=Python-2.7.13
FILE_OPENSSL=${DIR_OPENSSL}.tar.gz
FILE_PYTHON=${DIR_PYTHON}.tgz

jimyang2008

#!/bin/bash

set -e

FTP_BASE='ftp://ftp.yangjian.net/pub'
LIBEVENT=libevent-2.1.8-stable
NCURSES=ncurses
TMUX=tmux-2.6
OPT_DIR=$HOME/opt

jimyang2008

curl -LOk https://www.python.org/ftp/python/2.7.15/Python-2.7.15.tgz
tar -zf Python-2.7.15.tgz
cd Python.2.7.15
./configure --enable-optimization
make altinstall
curl -LOk https://bootstrap.pypa.io/get-pip.py
python2.7 get-pip.py

jimyang2008

Overview

tcpdump

• Is a packet content inspection tool
• Does packet filtering by boolean expression

For expression syntax, refere to pcap-filter(7)

Syntax

jimyang2008

#!/bin/bash

set -e

err() {
    echo "$@" >&2
}

prepare_redhat() {
    yum update -y