42 cheat sheet

The basics to start swimmig, written as a reference guide with some useful stuff for the code pool

ZSH (~/.zshrc)

setopt SHARE_HISTORY
setopt HIST_EXPIRE_DUPS_FIRST
setopt HIST_IGNORE_DUPS
setopt HIST_IGNORE_ALL_DUPS
setopt HIST_FIND_NO_DUPS
setopt HIST_IGNORE_SPACE
setopt HIST_SAVE_NO_DUPS
setopt HIST_VERIFY
export HISTSIZE=100
export SAVEHIST=100

export VISUAL=vim
export EDITOR=vim
export PATH=$PATH:$HOME/bin:$HOME/.local/bin

alias francinette=$HOME/francinette/tester.sh
alias paco=$HOME/francinette/tester.sh
alias cc="gcc -Wall -Werror -Wextra *.c && ./a.out"

BASH (~/.bashrc)

# Simple git prompt
COLOR_GIT_CLEAN='\[\033[1;30m\]'
COLOR_GIT_MODIFIED='\[\033[0;33m\]'
COLOR_GIT_STAGED='\[\033[0;36m\]'
COLOR_RESET='\[\033[0m\]'

function git_prompt() {
  if git rev-parse --is-inside-work-tree > /dev/null 2>&1; then
    branch_name=$(git symbolic-ref -q HEAD)
    branch_name=${branch_name##refs/heads/}
    branch_name=${branch_name:-HEAD}
    echo -n " → "
    if [[ $(git status 2> /dev/null | tail -n1) = *"nothing to commit"* ]]; then
      echo -n "$COLOR_GIT_CLEAN$branch_name$COLOR_RESET"
    elif [[ $(git status 2> /dev/null | head -n5) = *"Changes to be committed"* ]]; then
      echo -n "$COLOR_GIT_STAGED$branch_name$COLOR_RESET"
    else
      echo -n "$COLOR_GIT_MODIFIED$branch_name*$COLOR_RESET"
    fi
  fi
}

function prompt() {
  PS1="\u@\h [\w$(git_prompt)] \$ "
}

PROMPT_COMMAND=prompt

export VISUAL=vim
export EDITOR=vim
export PATH=$PATH:$HOME/bin:$HOME/.local/bin

alias francinette=$HOME/francinette/tester.sh
alias paco=$HOME/francinette/tester.sh
alias cc="gcc -Wall -Werror -Wextra *.c && ./a.out"

VIM (~/.vimrc)

set history=500
set autoread
set autoindent
set smartindent
set tabstop=4
set shiftwidth=4
set ruler
set incsearch
set showmatch
set number
set foldcolumn=1
set list
set listchars=tab:\ \ ›,nbsp:·,trail:·
set laststatus=2
syntax enable
highlight SpecialKey ctermfg=darkgray guifg=darkgray
let g:user42 = '42login'
let g:mail42 = '42login@student.42xxxx'

Also available at ~/.myvimrc in an exam, so memorize syntax enable

SSH (~/.ssh)

Generate keys with ssh-keygen, the public key should be at ~/.ssh/id_rsa.pub

GIT (~/src/repo/.git)

Upload an existing project to a remote repository, go inside your project's root folder and:

git init
git remote add origin <url>
git add <files>
git commit -m "<message>"
git push --set-upstream origin master

Start a new project from a remote repository just git clone <url> <new_folder>

Go into the <new_folder>, do your thing, then git add <files>, git commit -m "<message>" and git push

Norminette

Follow the installation guide

You need to have python's pip

And don't forget to update your $PATH

Use ~/.zshrc to have it every session

To add the header plugin for VIM, basically copy the stdheader.vim file to ~/.vim/plugin/stdheader.vim, like:

mkdir -p ~/.vim/plugin
curl -o ~/.vim/plugin/stdheader.vim https://raw.githubusercontent.com/42Paris/42header/master/plugin/stdheader.vim

And add the following lines to your ~/.vimrc (with your 42 login user and email):

let g:user42 = '42login'
let g:mail42 = '42login@student.42xxxx'

Note: You may need to install libbsd and compile with -lbsd flag to use bsb functions like strlcat and such...

Git stuff:

~/src/repo/.gitignore

.*
*.out
*.o
*.a

Depending on the project you could add to the list: main.c, *.sh, *.pdf...

Check the Git Cheat Sheet from GitHub.

Add stuff:

git add -f .gitignore to force adding a file even if it's on the ignore rules

git add --all add all files from all paths within your repository (follows ignore rules)

git add . add all files from the current folder (also follows ignore rules)

git commit -a -m "<message>" will add and commit ANY modified files that have already been added to the repository

Remove stuff:

git rm -rf <wrong_file/folder> careful, it's a single command to remove, stage, commit and push

Completely revert lastest commit:

git reset --hard HEAD^
git push origin -f

git checkout master -f <file> revert changes to match the current commit, could be the entire repo without <file>

git remote set-url origin <url> changes an existing remote repository <url>

Completely messed up a local repo and want to start over?

Could try rm -rf .git in the root repository folder

Check stuff:

git status pay attention to the messages

git log check that your HEAD is in the same commit as origin/master

git ls-files list of staged files (not necessarily pushed!)

git diff <file> see the current changes, checks all files if you don't specify some

git diff-tree --no-commit-id --name-only -r <commit-hash> list of files staged at a specific commit

git checkout <commit hash> go to a specific commit (get the hash from the git log)

git checkout master go to the latest commit