0x03-shell_variables_expansions

Shell, Init Files, Variables and Expansions

Project done during Full Stack Software Engineering studies at ALX School. It aims to learn about alias builtin, help builtin, local, global and reserved variables (PATH, HOME and PS1), special parameters $?, expansions, init files, arithmetics and single & double quotes in Shell.

Technologies

• Scripts written in Bash 5.1
• Tested on Ubuntu 20.04 LTS

Files

All of the following files are scripts

Filename	Descriptions
0-alias	Creates an alias
1-hello_you	Prints hello user, where user is the current Linux user.
2-path	Add /action to the PATH. /action should be the last directory the shell looks into when looking for a program.
3-paths	Counts the number of the directories in the PATH.
4-global_variables	List environment variables.
5-local_variables	Lists all local variables and environment variables, and functions.
6-create_local_variable	Creates a new local variable.
7-create_global_variable	Creates a new global variable.
8-true_knowledge	Prints the result of the addition of 128 with the value stored in the environment variable TRUEKNOWLEDGE.
9-divide_and_rule	Prints the result of POWER divided by DIVIDE.
10-love_exponent_breath	Displays the result of BREATH to the power of LOVE.
11-binary_to_decimal	Converts a number from base 2 to base 10.
12-combinations	Prints all possible combination of two letter, except for oo.
13-print_float	Prints a number with two decimal places followed by a new line and stored in NUM.
100-decimal_to_hexadecimals	Converts a number from base 10 to base 16.
101-rot13	Encodes and decodes text using the rot13 encryption.
102-odd	Prints every other line from the input, starting with the first line.
103-water_and_stir	Adds the two numbers stored in the environment variables WATER and STIR and prints the result.