Shell, init files, variables and expansions

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

Technologies

• Scripts written in Bash 4.3.11(1)
• Tested on Ubuntu 14.04 LTS

Files

All of the following files are scripts:

Filename	Description
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	Lists environment variables
5-local_variables	Lists all local variables and environment variables, and functions
6-create_local_variable	Creates a new local variable named BETTY
7-create_global_variable	Creates a new global variable named HOLBERTON
8-true_knowledge	Prints the result of the addition of 128 with the value stored in the environment variable TRUEKNOWLEDGE, followed by a new line
9-divide_and_rule	Prints the result of POWER divided by DIVIDE, followed by a new line
10-love_exponent_breath	Displays the result of BREATH to the power LOVE
11-binary_to_decimal	Converts a number from base 2 to base 10
12-combinations	Prints all possible combinations of two letters, except oo
13-print_float	Prints a number with two decimal places. The number is stored in the environment variable NUM
100-decimal_to_hexadecimal	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_str	Adds the two numbers stored in the environment variables WATER and STIR and prints the result