Commands Terminal

Description of this Note
Author

Danilo Toapanta

Published

September 3, 2023

1 Terminal

cd -    # one folder back
cd ..   # one up
cd ../  # two up
cd      # home directory 
cd /    # root directory
pwd         # print working directory
open <PATH>
open .     # open current folder you're in
touch <file.txt> # to create a file

2 Git Hub

git clone <HTTPS>    # copy repo from the HTTPS of the GitHub repository 
git status                      # to check whether the tree line has been updated
git add .                       # add all new folders and files to git repo
git add <name>       # add specific folder for the git repo
                                         # this is only to tell git taht there has been changes, we still need to commit
git commit -m "<message>"   # this save the files to git repo
git commit -m "<message>" -m "<message for the description box>"   # this save the files to git repo

So the way it works

  1. You change the code
  2. You need to save to the git file –> git add .
  3. You need to commit –> git commit - m “message”
  4. You push it to the repo –> git push main

2.1 Working with branches

https://youtu.be/QV0kVNvkMxc

2.2 Key Generation

ssh-keygen -t rsa -b 4096 -C "danilotpnta@gmail.com"   # to generate a key SSH
ls | grep git-key   # to check the keys available
                    # key.pub pub stands for public 
cat <example_key.pub>                     # to print the key

2.3 Generating a new SSH key

ssh-keygen -t ed25519 -C "danilotpnta@gmail.com"

2.4 Adding your SSH key to the ssh-agent

eval "$(ssh-agent -s)"
open ~/.ssh/config
vim ~/.ssh/config
ssh-add ~/.ssh/id_ed25519   # to add the key with name "id_ed25519"
cat ~/.ssh/id_ed25519.pub   # to print the key that we created

3 Vim

:wq     # to write/save and quit
ESC     # to scape from __INSERT__

3.1 Prompt Message

he Bash command prompt looks like this by default:

[USERNAME]@[HOSTNAME]:[PATH][SYMBOL]
  • [USERNAME] is the username of the currently operating user. normally this is your user, but when you run sudo su or similar commands, you get a “root shell”, that means the user is “root”.
  • [HOSTNAME] is your hostname. It’s the name of your computer. You had to enter that during the system installation.
  • [PATH] is your current working directory, the directory you’re currently operating on. When you open a new terminal, the default directory is your current user’s home directory. A synonym for /home/YOURUSERNAME is ~.
  • [SYMBOL] is usually either $ if you’re operating as any normal user, or # if you’re operating as “root” user.

So your Bash prompt looks like this:

ganesh@ganesh:~$

That means you’re logged in as user ganesh on a computer called ganesh as well, currently operating in your own home directory (~). Of course you’re not “root”, therefore the $.