https://m4nnb3ll.medium.com/minishell-building-a-mini-bash-a-42-project-b55a10598218

https://www.cs.purdue.edu/homes/grr/SystemsProgrammingBook/Book/Chapter5-WritingYourOwnShell.pdf

https://pubs.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html

https://www.youtube.com/watch?v=4jYFqFsu03A&list=PLGU1kcPKHMKj5yA0RPb5AK4QAhexmQwrW&index=7

En makefile

  -L/Users/$(USER)/.brew/opt/readline/lib -I/Users/$(USER)/.brew/opt/readline/include

Comp

  comp -lreadline terminal.c libft.a -L/Users/$USER/.brew/opt/readline/lib -I/Users/$USER/.brew/opt/readline/include && ./a.out

Readline Library

  https://tiswww.case.edu/php/chet/readline/readline.html

Para compilar readline

  -L/Users/$USER/.brew/opt/readline/lib 
  -I/Users/$USER/.brew/opt/readline/include

suprimir leaks readline

  valgrind --suppressions=readline.supp --leak-check=full --show-leak-kinds=all ./minishell

---

• Compile

  - USE make -n to see if compilation use -Wall -Wextra -Werror if not use invalid compilation flags
  - minishell Compile without errors if not use flags
  - makefile must not re-link
  

• Simple Command & global

  - Execute a simple command with an absolute path like /bin/ls or any other command without options
  - How many global variables? why? Give a concrete example of why it feels mandatory or logical.
  - Test an empty command.
  - Test only spaces or tabs.
  - if something crashes use the crash flag.
  - if something is not working use the incomplete work flag.
  

• Arguments & history

    - Execute a simple command with an absolute path like /bin/ls or any other command with arguments but without
      quotes and double quotes
    - Repeat multiple times with different commands and arguments
    - if something crashes use the crash flag.
    - if something is not working use the incomplete work flag.
  

• echo

    - Execute the echo command with or without arguments or -n
    - Repeat multiple times with different arguments
    - if something crashes use the crash flag.
    - if something is not working use the incomplete work flag.
  

• exit

    - Execute exit command with or without arguments
    - Repeat multiple times with different arguments
    - Don't forget to relaunch the minishell
    - if something crashes use the crash flag.
    - if something is not working use the incomplete work flag
  

• Return value of a process

    - Execute a simple command with an absolute path like /bin/ls or any other command with arguments but without
    quotes and double quotes then execute echo $?
    - Check the printed value. You can repeat the same in bash and compare it.
    - Repeat multiple times with different commands and arguments, use some failing commands like '/bin/ls
    filethatdoesntexist'
    - anything like expr $? + $?
    - if something crashes use the crash flag.
    - if something is not working use the incomplete work flag.
  

• Signals

  - Try ctrl-C in an empty prompt should show a new line with a new prompt
  - Try ctrl-\ in an empty prompt should not do anything
  - Try ctrl-D in an empty prompt should quit minishell --> RELAUNCH!
  - Try ctrl-C in a prompt after you wrote some stuff should show a new line with a new prompt
  - Try ctrl-D in a prompt after you wrote some stuff should not do anything
  - Try ctrl-\ in a prompt after you wrote some stuff should quit minishell --> RELAUNCH!
  - Try ctrl-C after running a blocking command like cat or grep without arguments
  - Try ctrl-\ after running a blocking command like cat or grep without arguments
  - Try ctrl-D after running a blocking command like cat or grep without arguments
  - Repeat multiple times with different commands
  - if something crashes use the crash flag.
  - if something is not working use the incomplete work flag.
  

• Double Quotes

  - Execute commands with simple quotes as an argument
  - Try empty arguments
  - Try environment variables, whitespaces, pipes, redirection in the simple quotes
  - echo '$USER' must print $USER
  - Nothing should be interprated
  

• env

  - Check if env shows you the current environment variables
  

• export

  - Export environment variables, create new ones, and replace old ones
  - Check them with env
  

• unset

  - Export environment variables, create new ones, and replace old ones
  - Use unset to remove some of them
  - Check the result with env
  

• cd

  - Use the command cd to move the working directory and check if you are in the right directory with /bin/ls
  - Repeat multiple times with working and not working cd
  - try '.' '..' as arguments too
  

• pwd

  - Use the command pwd
  - Repeat multiple times in multiple directories
  

• Relative Path

  - Execute commands but this time use a relative path
  - Repeat multiple times in multiple directories with a complex relative path (lots of ..)
  - Execute commands but this time without any path. (ls, wc, awk etc...)
  - Unset the $PATH and check if it is not working anymore
  - Set the $PATH to a multiple directory value (directory1:directory2) and check that directories are checked in order
    from left to right
  

• Redirection

  - Execute commands with redirections < and/or >
  - Repeat multiple times with different commands and arguments and sometimes change > with >>
  - Check if multiple of the same redirections fail
  - Test << redirection (it doesn't need to update history).
  

• Pipes

  - Execute commands with pipes like 'cat file | grep bla | more'
  - Repeat multiple times with different commands and arguments
  - Try some failing commands like 'ls filethatdoesntexist | grep bla | more'
  - Try to mix pipes and redirections.
  

• Go Crazy and history

  - type a command line then use ctrl-C then press enter the buffer should be clean and nothing try to execute.
  - Can we navigate through history with up and down and retry some command
  - Execute commands that should not work like 'dsbksdgbksdghsd' and check if the shell doesn't crash and prints an
    error
  - Try to execute a long command with a ton of arguments
  - Have fun with that beautiful minishell and enjoy it
  

• Environment Variables

  - Execute echo with some $ variables as argumentss
  - Check that $ is interprated as an environment variable
  - Check that double quotes interpolate $
  - Check that $USER exist or set it.
  - echo "$USER" should print the value of $USER
  

BONUS

• And, Or

  - Use &&, || and parenthesis with commands and check if it works as bash
  

• WildCard

   - Use wildcards in arguments for the local directory.
  

• Surprise (or not...)

  - set USER environment variable.
  - Test echo "'$USER'" this should print 'USER_VALUE'
  - Test echo '"$USER"' this should print "$USER"