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