todo.txt

FIX THE PARSING

export A=luciekin && echo $A'chauffour'
--> The export is done, but its result is not used for the second command.

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IMPROVE THE PIPELINE

- Sequential instead of full setup. See if `cat | cat | ls`, 
`sleep 2 | sleep 3` and `cat /dev/urandom | head -n 5` still work properly. 
They should, as it's how Bash does it.

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THE "_" ENV VAR

- The "_" var is initialized to the input used to call the shell or script 
(argv[0]). Keep this value for `$0`, and remove the var from the env list to 
store it in the intern list.
- It doesn't show in the export list, because it belongs to the intern var 
list. Don't ever export it.
- It is updated to the last arg of the most recent simple command (= no pipe).
- Within a pipeline, it is added to the env list and is set to the relative 
path of the command (the future argv[0] of this command).

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THE "SHLVL" ENV VAR

- If the var doesn't exist when opening bigerrno or before calling execve, 
initialize it to 0.
- Then, increment it when opening bigerrno.
- In the child process, decrement it unless the command is a shell.

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