Kathirvel Rajendran linuxkathirvel

Python 3 virtual environment by pip

sudo apt-get install python-pip python-dev -y
sudo apt-get install python3
pip install virtualenv

virtualenv -p python3 py3env
source py3env/bin/activate
pip install --upgrade virtualenv

Install PostgreSQL 9.6 in CentOS7

sudo yum install https://download.postgresql.org/pub/repos/yum/9.6/redhat/rhel-7-x86_64/pgdg-centos96-9.6-3.noarch.rpm -y
sudo yum install postgresql96 -y
sudo yum install postgresql96-server -y

sudo /usr/pgsql-9.6/bin/postgresql96-setup initdb
sudo systemctl enable postgresql-9.6
sudo systemctl start postgresql-9.6

Python coding style - PEP8

Indentation

# Use 4 spaces per indentation level.
add = addition(number1, number2,
                number3, number4)

def addition(
      number1, number2,
 number3):

# Open /boot/grub/grub.cfg
sudo vim /boot/grub/grub.cfg

# Add below lines in /boot/grub/grub.cfg file after "### END /etc/grub.d/40_custom ###" line
menuentry "Ubuntu 18.04.1 LTS ISO" {
         set isofile="/ubuntu-18.04.1-desktop-amd64.iso"
         loopback loop (hd0,2)$isofile
         linux (loop)/casper/vmlinuz boot=casper iso-scan/filename=$isofile noprompt noeject
 initrd (loop)/casper/initrd.lz

LDAP Terminology

LDIF - LDAP Data Interchange Format

sudo su
yum install openldap openldap-clients openldap-servers
slappasswd
systemctl start slapd
systemctl enable slapd

MySQL 5.7 installation in CentOS 7

sudo su

# Remove MariaDB packages
yum list installed | grep -i maria
yum remove mariadb.x86_64
yum remove mariadb-libs.x86_64

# Download MySQL 5.7 RPM tar

Change a MySQL Data Directory to a New Location on CentOS 7

mysql -u root -p

# Check current data directory
mysql> select @@datadir;
+-----------------+
| @@datadir       |
+-----------------+
| /var/lib/mysql/ |

Open Bookmarks Always in New Tab in Firefox

Enter 'about:config' in address bar
Click 'I accept the risk' button
Search 'browser.tabs.loadBookmarksInTabs'
Change 'browser.tabs.loadBookmarksInTabs' value as 'true'
Close the tab

	" for HTML
	autocmd FileType html setlocal shiftwidth=2 tabstop=2

	" enable syntax highlighting
	syntax enable
	filetype on
	filetype plugin on
	filetype indent on
	" set color scheme
	" colorscheme elflord

	import datetime
	print str(filter(str.isdigit, str(datetime.datetime.now())))