TO WYGLĄDA JAK TWOJA ZAGINIONA MATKA! POWIEDZIAŁA NARZECZONA MILIONERA, A ON ZAMARŁ
Mikołaju, ta kobieta wygląda dokładnie jak twoja zaginiona matka krzyknęła Kinga, wskazując na kobietę siedzącą na ch# 0x00. Shell, basics
## Learning Objectives
At the end of this project, you are expected to be able to explain to anyone, without the help of Google:
### 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?
## Requirements
### General
– Allowed editors: vi, vim, emacs
– All your scripts will be tested on Ubuntu 20.04 LTS
– All your scripts should be exactly two lines long ($ wc -l file should print 2)
– All your files should end with a new line (why?)
– The first line of all your files should be exactly #!/bin/bash
– A README.md file at the root of the repo, containing a description of the repository
– A README.md file, at the root of the folder of this project, describing what each script is doing
– You are not allowed to use backticks, &&, || or ;
– All your scripts must be executable. To make your file executable, use the chmod command: chmod u+x file. Later, well learn more about how to use this command.
# More Info
### Example of line count and first line
“`
julien@ubuntu:/tmp$ cat 12-file_type
#!/bin/bash
echo “Hello, World”
julien@ubuntu:/tmp$ wc -l 12-file_type
2 12-file_type
julien@ubuntu:/tmp$ head -n 1 12-file_type
#!/bin/bash
julien@ubuntu:/tmp$
“`
### In order to test your scripts, you will need to use this command: chmod u+x file. We will see later what does chmod mean and do, but you can have a look at man chmod if you are curious.
“`
julien@ubuntu:/tmp$ ls -l
total 4
-rw-rw-r– 1 julien julien 44 Sep 20 14:48 12-file_type
julien@ubuntu:/tmp$ chmod u+x 12-file_type
julien@ubuntu:/tmp$ ls -l
total 4
-rwxrw-r– 1 julien julien 44 Sep 20 14:48 12-file_type*
julien@ubuntu:/tmp$ ./12-file_type
Hello, World
julien@ubuntu:/tmp$
“`
