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42minishell's Introduction

Minishell Projecs

builtins_implemented

command description
echo echo the STRING(s) to standart output. -n flag: do not output the trailing newline
cd change the shell working directory (with a relative or absolute path)
pwd print name of current/working directory
export set export attribute for shell variables
unset unset values of shell variables
env print the environment
exit cause the shell to exit with the exit status specified

step_by_step

  • Prompt implementation
  • HashTable functions implementation
  • Tokenizer implementation
  • Variables expansion implementation
  • Builtins implementation
  • Parse and execute sistem design
  • Signals implementation
  • Parsing implementation
  • Execute implementation
  • Norme
  • Bugs hunting

study_resources

unix

hashtable

tokenizer

more

42minishell's People

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42minishell's Issues

Tokenizer implementation

Tokenization is breaking the raw text into small chunks. Tokenization breaks the raw text into words, sentences called tokens. These tokens help in understanding the context or developing the model for the NLP. The tokenization helps in interpreting the meaning of the text by analyzing the sequence of the words

  • check and insert space
  • split token
  • check quotes.
  • expand variables.
  • define type
  • add token

hash table

hash table I use dbj2 algorithm for hash env value

  • hash -> to get the best index to save value on a hash table. Djb2.
  • init and create a table for saving our env value.
  • insert value.
  • find value.
  • delete value.
  • print table.
  • check leak and clear

Convert command_table into structure with

Every command will be in a structure that contains all of its info together. This will organize minishell structure and allow tokens to be grouped with all of its tokens, filenames, execve tables, etc.

Screen Shot 2022-05-23 at 7 56 07 PM

Project structure design

->include
for headers file
-> lib
libft , gext_next_line,..
-> src
-->tools
-->utils
-->....
mina.c
MakeFile

Parsing input from readline

creating parser that store commands in command_table and try to execute.
Later must add support for double/single qoute " ' , pipes | , redirect, env var $, etc.

Makefile relink

Issue

when updating any external library it's not updated if use make re

expect:
when use make re all library update with last change

get path for command every table

Now our shell works on any system. I update execute functions to update the cmd path every execute

Ok, everything is fine, but if written
ls -la | grep Makefile.

msh->command_table[0] => its OK
msh->command_table[1] => no return

I think the issue is output from msh->command_table[0] . It's not showing for msh->command_table[1] for that's still waiting

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