42sh : code your own shell !!

This is a 42 school project. The purpose is to create our own shell from scratch, using only the really basics fuctions :

• functions from man 2
• library Termcaps
• getpwnam, tcgetpgrp and tcsetpgrp

Features :

Basic features

• Executing basic commands
• Show a prompt
• Error handling

21sh features

• Complete line edition
• Redirections and aggregations operators : >, <, >>, <<, >&, <&
• Pipes : |

42sh Features :

Line edition

Variable managment

Job Control :

• builtins : jobs, fg, bg

Signal manager :

Posix builtins :

• cd, echo, exit
• type, pwd
• set, unset (not posix, as asked in subject)

Quoting :

• Double quoting : "
• simple quoting '
• backslash : \

Pattern matching :

• * : match any string (even null string)
• ? : match any character
• [] : match any char contained between brace (support interval : [A-z])
• [!] : match any char not contained in braces (support interval too)

Tilde and parameter expansions : ~/ and ${} :

• ~/ and ~user/
• ${param:-word} and ${param-word}
• ${param:=word} and ${param=word}
• ${param:?word} and ${param?word}
• ${param:+word} and ${param+word}
• ${param##word} and ${param#word}
• ${param%%word} and ${param%word}

Grouped commands and subshells : () and {}

Command subsitution : $(cmd) and `cmd`

Processus substitution : <() and >()

Historique manager :

• Expansions : !!, !word, !number, !-number
• Save in a file
• fc builtin
• Incremental research : CTRL-R

Dynamic autocompletion :

• commands
• builtins
• variables

Vim and Readline modes :

• Vi shortcuts : #, ,v,j,k,l,h,w,W,e,E,b,B,ˆ,$,0,|,f,F,t,T,;,,,a,A,i,I,r,R, c, C, S, x, X, d, D, y, Y, p, P, u, U.
• Readline shortcuts : C-b, C-f, A-f, A-b, C-a, C-e, C-x-x, Backspace, C-d, C-u, C-k, A-d, C-w, C-y, C-p, C-n, C-_, C-t, A-t.

Alias manager :

• Alias expansion
• Alias and unalias builtins

Hash table :

• Hash table to store apth to binaries used
• hash builtin

Test builtin :

• options : -b, -c, -d, -e, -f, -g, -L, -p, -r, -S, -s, -u, -w, -x, -z, =, !=, -eq, -ne, -ge, -lt, -le, !.

Bonuses :

• Handle utf-8 chars : see 🐑 builtin

Auteur :

• jmartel
• ldedier
• mdaoud
• jdugoudr