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# copy from https://www.liquidweb.com/kb/how-to-install-pip-on-centos-7/

# First, we’ll install the EPEL repository
yum install epel-release

# As a matter of best practice we’ll update our packages:
yum -y update
yum -y install python-pip

# Check the version of Pip that is installed:

liyang85

# Part 1: network
cp /etc/sysconfig/network-scripts/ifcfg-eth0 /etc/sysconfig/network-scripts/ifcfg-eth0.ori
sed -i 's/ONBOOT=no/ONBOOT=yes/; s/BOOTPROTO=dhcp/BOOTPROTO=none/' /etc/sysconfig/network-scripts/ifcfg-eth0
sed -i '$a IPADDR=192.168.6.240\nPREFIX=24\nGATEWAY=192.168.6.1' /etc/sysconfig/network-scripts/ifcfg-eth0
sed -i '$a DNS1=223.5.5.5\nDNS2=119.29.29.29' /etc/sysconfig/network-scripts/ifcfg-eth0
ifdown eth0 && ifup eth0

# If you use a VMware cloned virtual machine, you'll see an error:
# `Device eth0 does not seem to be present, delaying initialization.`, you can change DEVICE name and HWADDR to solve it.
cat /etc/udev/rules.d/70-persistent-net.rules

liyang85

cd /home/oldboy/tools

# 1. Install dependencies
# Part 1: yum install
yum install -y		 	\
	freetype-devel	 	\
	gd-devel 		\
	libcurl-devel 		\
	libjpeg-turbo-devel 	\
	libpng-devel 		\

liyang85

# part 1: installation

yum install epel-release
yum install fail2ban

# part 2: configure local settings
#
# You can find a file with default values called `/etc/fail2ban/jail.conf`. 
# Since this file may be overwritten by package upgrades, we shouldn't edit it in-place. 
# Instead, we'll write a new file called `/etc/fail2ban/jail.local`. 

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# Part 1: CentOS 6

vim /etc/sysconfig/network
  HOSTNAME=my_hostname
source /etc/sysconfig/network

# `hostname` can set the host name until reboot,
# it also can show the host name
hostname

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set noautofocus

let blacklists = ["https://checkvist.com/*","https://inbox.google.com/*","https://calendar.google.com/*","https://drive.google.com/*","https://keep.google.com/*","https://mail.google.com/*","https://mubu.com/*","https://leanote.com/*","https://docs.google.com/*","https://mynoise.net/*","https://onedrive.live.com/*","https://kiwivm.64clouds.com/*","https://dida365.com/*","http://localhost/*","https://dynalist.io/*","http://cv.ftqq.com/*","https://todoist.com/*","https://www.youtube.com/*"]

let mapleader = ","

map <Leader>x :restore<Space>

" You can use <Space>, which is interpreted as a
" literal " " character, to enter buffer completion mode

liyang85

To belabor the obvious: IP addresses are 32 bit values written as four numbers (the individual bytes of the IP address) separated by dots (periods). Each of the four numbers has a valid range of 0 to 255.

The following bash script contains a bash function which returns true if it is passed a valid IP address and false otherwise. In bash speak true means it exits with a zero status, anything else is false. The status of a command/function is stored in the bash variable "$?".

#!/bin/bash

# Test an IP address for validity:
# Usage:
#      valid_ip IP_ADDRESS

liyang85

#!/bin/bash

read name    
while [[ ! "$name" =~ '[A-Za-z ]' ]]; do
    read -p "Wrong name format. Re-enter: " name
done

name="${name// /_}"

read ip

liyang85

# find the target file in the package
rpm2cpio httpd-2.2.15-59.el6.centos.x86_64.rpm | cpio -tv | grep "init.d/httpd"

# view content of the target file then redirect it
rpm2cpio httpd-2.2.15-59.el6.centos.x86_64.rpm | cpio -i --to-stdout ./etc/rc.d/init.d/httpd > /etc/rc.d/init.d/httpd

liyang85

yum -y install ncurses-devel
./configure
make && make install
install -m 644 etc/etcscreenrc /etc/screenrc