Bash Shell Scripting Tutorial 10 - Command Substitution

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Bash Shell Scripting Tutorial: https://youtube.com/playlist?list=PLnisUReSm0-neF6F_OJcAQyFy_62XJ7bW
Topics Covered:
1. Introduction
2. Bash Scripting
3. Linux Filesystem and File Permissions
4. Absolute vs Relative Path
5. Hello World! Bash Script
6. Echo Command
7. Comments
8. Quotes
9. Variables
10. Command Substitution
11. Command Line Arguments
12. Read User Input

According to the Bash Official Documentation:
"Command Substitution allows the output of a command to replace the command itself. Bash performs the expansion by executing the command in a subshell environment and replacing the command substitution with the standard output of the command, with any trailing newlines deleted. Embedded newlines are not deleted, but they may be removed during word splitting."

Command substitution refers to an expansion which Bash performs for us. It takes the output of the Bash command, stores in a variable (generally), and display back with echo.

Command Substitution offers data flexibility in regards to scripting and variable assignment. It is simple and easy for having the single command line output. In case, the output goes over a few lines, then the newly trailing lines are removed, and the full content of output ends up on a single line.

Bash (Bourne Again Shell) is a command line interpreter that typically runs in a text window where user can interpret commands to carry out various actions. The combination of these commands as a series within a file is known as a Shell Script. Bash can read and execute the commands from a Shell Script.

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