Video: Setup logstash/kibana/elastic-search

Introduction to DevOps - Video

Big Data is better Data

Display size of all subdirectories from current directory in Linux

To display the size the command is "du".

du

You could check the man page and help for the command, a useful modifier is "-h", which as in the "ls" command it converts the size to a more practical representation.

du -h

Show and display human readable size in files and directories listing on Linux

"h" is the ls modifier required to display GB, MB, KB and related information.

ls -lh
ls -lah

Python str bracket format summary

Number	Format	Output	Description
3.1415926	{:.2f}	3.14	2 decimal places
3.1415926	{:+.2f}	3.14	2 decimal places with sign
-1	{:+.2f}	-1	2 decimal places with sign
2.71828	{:.0f}	3	No decimal places
5	{:0>2d}	5	Pad number with zeros (left padding, width 2)
5	{:x<4d}	5xxx	Pad number with x’s (right padding, width 4)
10	{:x<4d}	10xx	Pad number with x’s (right padding, width 4)
1000000	{:,}	1,000,000	Number format with comma separator
0.25	{:.2%}	25.00%	Format percentage
1000000000	{:.2e}	1.00E+09	Exponent notation
13	{:10d}	13	Right aligned (default, width 10)
13	{:<10d}	13	Left aligned (width 10)
13	{:^10d}	13	Center aligned (width 10)

Installing Oracle JDK JRE on Debian / Ubuntu

To install it, you just need to execute the following commands in order. I am assuming a new clean installation.

sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java7-installer