Bash Shell and (Unix|Linux) Utilities (XCU)

About

Bash is a POSIX compliant shell, known as the Bourne-Again.

It means that this is scripting language used in a terminal based around Process - Command (Command line)

The articles of this section are over:

• the Bash (Bourne-Again Shell)
• the posix Shell and its utilities. The acronym “XCU” derives from “Unix Commands and Utilities”
• the Oracle/Redhat/Cent OS Linux Distribution

If not, it will be specified.

Grammar

With bash, you have:

• variable
• function
• conditions (if then)
• loop

With all this grammar syntax, you can create data pipelines.

In a script, if there's a problem, the program will NOT stop.

Example

Log analysis of an OVH attack:

Documentation / Reference

• The single unix specification (PDF)
• The POSIX standard (paid): The certification 1003.13-2003 (Certification Web Site)
• Bash (Bourne-Again Shell)
• Advanced Bash-Scripting Guide An in-depth exploration of the art of shell scripting Mendel Cooper