21sh

Project from UNIX branch in school 42

Project 21sh is the continuation of the project minishell

New in 21sh project

Mandatory implementations

[✓] Pipes '|'

[✓] The 4 following redirections '<', '>', '<<' and '>>'

[✓] File descriptor aggregation '<&' and '>&'

[✓] Basic line editing features using termcap library

Bonuses

[✓] Implementation of Hash Table for binary files, also the hash builtin command

[✓] Advanced auto completion using tab

[✓] Search through history using ctrl+R

[✓] Some other line editing features (see below)

Hotkey list for line editing:

Key		Details
Left	←	move cursor backward by one character
Right	→	move cursor forward by one character
Up	↑	List term history up
Down	↓	List term history down
Ctrl + Left	⌃←	move cursor backward by one word
Ctrl + Right	⌃→	move cursor forward by one word
Ctrl + Up	⌃↑	move cursor backward by one row
Ctrl + Down	⌃↓	move cursor forward by one row
Ctrl + Shift + Left	⌃⇧←	delete the word in front of the cursor
Ctrl + Shift + Right	⌃⇧→	delete the word after the cursor
Ctrl + Shift + Up	⌃⇧↑	delete the row in front of the cursor
Ctrl + Shift + Down	⌃⇧↓	delete the row after the cursor
Return	⏎	Confirm line entry
Backspace	⌫	delete one previous character from current position of cursor
Delete	⌦	delete one character from current position of cursor
Home	⇱	move cursor to the beginning of the line
End	⇲	move cursor to the end of the line
Tab	⇥	Auto compilation
Ctrl + R	⌃R	Search history
Ctrl + A	⌃A	work same as Home
Ctrl + E	⌃E	work same as End
Ctrl + U	⌃U	clear all characters in front the cursor
Ctrl + K	⌃K	clear all characters after the cursor
Ctrl + G	⌃G	clear all characters in line
Ctrl + H	⌃H	Undo the last change
Ctrl + L	⌃L	clear screen

Preview

Preview output

➜  21sh git:(master) ./21sh
✓ (21sh) cd /tmp/test_dir/
✓ (test_dir) pwd
/tmp/test_dir
✓ (test_dir) env
TERM_SESSION_ID=w0t0p0:D3D7901C-F606-4245-89ED-C2B1F3E713F3
SSH_AUTH_SOCK=/private/tmp/com.apple.launchd.ldiuufG508/Listeners
LC_TERMINAL_VERSION=3.3.6
Apple_PubSub_Socket_Render=/private/tmp/com.apple.launchd.lcd6sflWma/Render
COLORFGBG=7;0
ITERM_PROFILE=Default
XPC_FLAGS=0x0
PWD=/tmp/test_dir
SHELL=21sh
LC_CTYPE=UTF-8
TERM_PROGRAM_VERSION=3.3.6
TERM_PROGRAM=iTerm.app
PATH=/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/mysql/bin
LC_TERMINAL=iTerm2
COLORTERM=truecolor
TERM=xterm-256color
HOME=/Users/prippa
TMPDIR=/var/folders/nc/lc4x38yx18sgjmwh0qyy9prw0000gn/T/
USER=prippa
XPC_SERVICE_NAME=0
LOGNAME=prippa
ITERM_SESSION_ID=w0t0p0:D3D7901C-F606-4245-89ED-C2B1F3E713F3
__CF_USER_TEXT_ENCODING=0x0:7:49
SHLVL=2
OLDPWD=/Users/prippa/Desktop/21sh
LC_ALL=en_US.UTF-8
LANG=en_US.UTF-8
ZSH=/Users/prippa/.oh-my-zsh
PAGER=less
LESS=-R
LSCOLORS=Gxfxcxdxbxegedabagacad
_=env
✓ (test_dir) touch riri
✓ (test_dir) ls
riri
✓ (test_dir) rm riri ;cat riri 2>&-
✕ (test_dir) cat riri
cat: riri: No such file or directory
✕ (test_dir) mkdir test; cd test; ls -a; ls | cat | wc -c > fifi; cat fifi
.	..
       5
✓ (test) pwd
/tmp/test_dir/test
✓ (test) echo '
quote> Hello
quote> World
quote> !
quote> '; echo "awesome $SHELL";\
> exit

Hello
World
!

awesome 21sh
exit
➜  21sh git:(master)

more info