khdevam / alx-system_engineering-devops

Repository for Shell project.

Hello in ALX System Engineering Devops Repository

This repository contain :

0x00-shell_basics :

• General
  • What does RTFM mean?
  • What is a Shebang
  • What is the Shell
  • What is the shell
  • What is the difference between a terminal and a shell
  • What is the shell prompt
  • How to use the history (the basics)
• Navigation
  • What do the commands or built-ins cd, pwd, ls do
  • How to navigate the filesystem
  • What are the . and .. directories
  • What is the working directory, how to print it and how to change it
  • What is the root directory
  • What is the home directory, and how to go there
  • What is the difference between the root directory and the home directory of the user root
  • What are the characteristics of hidden files and how to list them
  • What does the command cd - do
• Looking Around
  • What do the commands ls, less, file do
  • How do you use options and arguments with commands
  • Understand the ls long format and how to display it
• A Guided Tour
  • What does the ln command do
  • What do you find in the most common/important directories
  • What is a symbolic link
  • What is a hard link
  • What is the difference between a hard link and a symbolic link
• Manipulating Files
  • What do the commands cp, mv, rm, mkdir do
  • What are wildcards and how do they work
  • How to use wildcards
  • Working with Commands
  • What do type, which, help, man commands do
  • What are the different kinds of commands
  • What is an alias
  • When do you use the command help instead of man
• Reading Man Pages
  • How to read a man page
  • What are man page sections
  • What are the section numbers for User commands, System calls and Library functions
  • Keyboard Shortcuts for Bash
  • Common shortcuts for Bash
• LTS
  • What does LTS mean?

0x01-shell_permissions :

• Permissions
  • What do the commands chmod, sudo, su, chown, chgrp do
  • Linux file permissions
  • How to represent each of the three sets of permissions (owner, group, and other) as a single digit
  • How to change permissions, owner and group of a file
  • Why can’t a normal user chown a file
  • How to run a command with root privileges
  • How to change user ID or become superuser
• Other Man Pages
  • How to create a user
  • How to create a group
  • How to print real and effective user and group IDs
  • How to print the groups a user is in
  • How to print the effective userid

0x02-shell_redirections :

• Shell, I/O Redirection
  • What do the commands head, tail, find, wc, sort, uniq, grep, tr do
  • How to redirect standard output to a file
  • How to get standard input from a file instead of the keyboard
  • How to send the output from one program to the input of another program
  • How to combine commands and filters with redirections
  • Special Characters
  • What are special characters
  • Understand what do the white spaces, single quotes, double quotes, backslash, comment, pipe, command separator, tilde and how and when to use them
• Other Man Pages
  • How to display a line of text
  • How to concatenate files and print on the standard output
  • How to reverse a string
  • How to remove sections from each line of files
  • What is the /etc/passwd file and what is its format
  • What is the /etc/shadow file and what is its format

0x03-shell_variables_expansions :

• General
  • What happens when you type $ ls -l *.txt
• Shell Initialization Files
  • What are the /etc/profile file and the /etc/profile.d directory
  • What is the ~/.bashrc file
• Variables
  • What is the difference between a local and a global variable
  • What is a reserved variable
  • How to create, update and delete shell variables
  • What are the roles of the following reserved variables: HOME, PATH, PS1
  • What are special parameters
  • What is the special parameter $??
• Expansions
  • What is expansion and how to use them
  • What is the difference between single and double quotes and how to use them properly
  • How to do command substitution with $() and backticks
• Shell Arithmetic
  • How to perform arithmetic operations with the shell
• The alias Command
  • How to create an alias
  • How to list aliases
  • How to temporarily disable an alias
• Other help pages
  • How to execute commands from a file in the current shell