Trần Đình Đồng vanvuvuong

Reference: https://help.ubuntu.com/community/Oracle%20Instant%20Client

Tested on: Ubuntu 18.04, 20.04

Decide which version of the Oracle client to install
- Each version of the client supports certain versions of the database; for example, Oracle client 12.1 supports Oracle database 10.2 - 19c
- See here for more information: http://support.oracle.com/epmos/faces/DocumentDisplay?id=207303.1
Download the Oracle client packages
- Go here and download the desired RPM package(s): https://www.oracle.com/database/technologies/instant-client/downloads.html

Environment:

CentOS 7

Prerequistes:

Packages:

zip unzip wget bc binutils compat-libcap1 compat-libstdc++-33 dtrace-modules dtrace-modules-headers \
dtrace-modules-provider-headers dtrace-utils elfutils-libelf elfutils-libelf-devel \

Operator	Description
! EXPRESSION	The EXPRESSION is false.
condition 1 -a condition 2	CONDITION 1 and CONDITION 2.
condition 1 -o condition 2	CONDITION 1 or CONDITION 2.
-n STRING	The length of STRING is greater than zero.
-z STRING	lengh of STRING is zero (ie it is empty).
STRING1 =/!= STRING2	STRING1 is equal/not-equal to STRING2
INTEGER1 -eq/ne INTEGER2	INTEGER1 is numerically equal/not-equal to INTEGER2

Variables	Description
ENVIRON	An associative array of environment variables.
FIELDWIDTHS	Specify the field width
FS	The field seperator
RS	The record seperator, default is new line
NF	The number of fields in the current record
NR	The number of the current record
FNR	Similar to NR, but relative to the current file. It is useful when AWK is operating on multiple files. Value of FNR resets with new file.
OFS	The output field seperator, space by default

	visible in terminal		visible in file		existing
Syntax	StdOut	StdErr	StdOut	StdErr	file
>	no	yes	yes	no	overwrite
>>	no	yes	yes	no	append

2>	yes	no	no	yes	overwrite
2>>	yes	no	no	yes	append

&>	no	no	yes	yes	overwrite

Processing JSON using jq

jq is useful to slice, filter, map and transform structured json data.

Installing jq

On Mac OS

brew install jq

Markdown Text 101

Want to inject some flavor into your everyday text chat? You're in luck! Discord uses Markdown, a simple plain text formatting system that'll help you make your sentences stand out. Here's how to do it! Just add a few characters before & after your desired text to change your text! I'll show you some examples...

What this guide covers:

Text Formatting
Organizational Text Formatting
- Headers
Masked Links

A curated list of AWS resources to prepare for the AWS Certifications

A curated list of awesome AWS resources you need to prepare for the all 5 AWS Certifications. This gist will include: open source repos, blogs & blogposts, ebooks, PDF, whitepapers, video courses, free lecture, slides, sample test and many other resources.

ARN Base Pattern

arn:<aws_parition>:<aws_service>:[<aws_region>]:<account_id>:<root | resource_type>:/<resource_name>[/<sub_resource_names>...]

i.<aws_partition>

Regex: (aws|aws-us-gov|aws-cn)

	# To list installed distributions
	wsl -l
	wsl --list

	# To list installed distributions along with its running status and wsl config being 1 or 2
	wsl -l --verbose
	wsl -l -v

	# To run a specific distro
	wsl -d distro_name