Rock & roll with shell

In this session, we will get familiar with shell commands with pop and rock music!

Getting started

Fork and clone repo
get into the project directory (cd): cd learn-shell
Complete the tasks below sequentially

Tasks

Navigation

Find out the absolute path to where you currently are: pwd
List the contents of your current directory ls
List the contents of your current directory with some options: ls -l and ls -la
Navigate into the pop directory: cd pop
Navigate back: cd ..
Navigate into the adele directory: cd pop/adele
Navigate back: cd ../..

Reading files

Print the lyrics to adele's "hello.txt": cat ./pop/adele/hello.txt or cat pop/adele/hello.txt (the . is optional)
Print the lyrics to adele's "someone-like-you.txt": cat pop/adele/someone-like-you.txt
Replace cat with less (press q when you want to exit)

Moving/renaming files/directories

Move set-fire-to-the-rain.txt to the right folder (pop/adele): mv my_source_filepath my_target_filepath
- you can move: mv ./set-fire-to-the-rain.txt ./pop/adele/
- you can move and rename simultaneously: mv ./set-fire-to-the-rain.txt ./pop/adele/SET-FIRE-TO-THE-RAIN.txt
Renaming files/directories
- mv ./pop/adele/SET-FIRE-TO-THE-RAIN.txt ./pop/adele/set-fire-to-the-rain.txt
- mv pop old-pop

Creating files and directories

Creating files:
- touch somefile
- touch otherfile.txt
- touch anotherfile.js
Creating directories:
- mkdir jazz

Deleting files and directories

Deleting files:
- rm somefile
- rm otherfile.txt anotherfile.js
Deleting directories:
- rm -rf jazz

See history

history

Pipe

Pipe (|) allows us to pipe the output of one command --> as the input to another command

Example use case #1: grep
- history | grep 'touch'
- history | grep '.txt'
Example use case #2: wc (count)
- count number of lines in a file
  - cat ./pop/adele/hello.txt | wc -l
  - cat ./pop/adele/someone-like-you.txt | wc -l

When in doubt, `man` up!

Examples:
- man mkdir
- man ls
- man wc