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simple_shell's Introduction

Simple Shell


Command line interpreter

This project is an implementation of the shell created as the final project for the C code sprint at ALX Africa. It covers select system calls - least privilege - for basic command line functionality. In the mix are a few syscalls and functions used here: wait, fork, execve, exit, perror, getline, strok, etc. It partly emulates the UNIX shell sh.

Compilation:

gcc -Wall -Werror -Wextra -pedantic -std=gnu89 *.c -o shell

usage

This shell program works like this in interactive mode:

root@HP:/alx-SE/simple_shell# ls
AUTHORS  README.md  _execve.c  get_line.c  hack  shell  shell.c  shell.h  split_line.c
root@HP:/alx-SE/simple_shell# ./shell
#cisfun$ ls
AUTHORS  README.md  _execve.c  get_line.c  hack  shell  shell.c  shell.h  split_line.c
#cisfun$ /bin/ls
AUTHORS  README.md  _execve.c  get_line.c  hack  shell  shell.c  shell.h  split_line.c
#cisfun$ env
SHELL=/bin/bash
SUDO_GID=1000
SUDO_COMMAND=/usr/bin/su
SUDO_USER=mu-o
PWD=/alx-SE/simple_shell
LOGNAME=root
HOME=/root
LANG=C.UTF-8
LS_COLORS=rs=0:di=01;34:ln=01;36:mh=00:pi=40;33:so=01;35:do=01;35:bd=40;33;01:cd=40;33;01:or=40;31;01:mi=00:su=37;41:sg=30;43:ca=30;41:tw=30;42:ow=34;42:st=37;44:ex=01;32:*.tar=01;31:*.tgz=01;31:*.arc=01;31:*.arj=01;31:*.taz=01;31:*.lha=01;31:*.lz4=01;31:*.lzh=01;31:*.lzma=01;31:*.tlz=01;31:*.txz=01;31:*.tzo=01;31:*.t7z=01;31:*.zip=01;31:*.z=01;31:*.dz=01;31:*.gz=01;31:*.lrz=01;31:*.lz=01;31:*.lzo=01;31:*.xz=01;31:*.zst=01;31:*.tzst=01;31:*.bz2=01;31:*.bz=01;31:*.tbz=01;31:*.tbz2=01;31:*.tz=01;31:*.deb=01;31:*.rpm=01;31:*.jar=01;31:*.war=01;31:*.ear=01;31:*.sar=01;31:*.rar=01;31:*.alz=01;31:*.ace=01;31:*.zoo=01;31:*.cpio=01;31:*.7z=01;31:*.rz=01;31:*.cab=01;31:*.wim=01;31:*.swm=01;31:*.dwm=01;31:*.esd=01;31:*.jpg=01;35:*.jpeg=01;35:*.mjpg=01;35:*.mjpeg=01;35:*.gif=01;35:*.bmp=01;35:*.pbm=01;35:*.pgm=01;35:*.ppm=01;35:*.tga=01;35:*.xbm=01;35:*.xpm=01;35:*.tif=01;35:*.tiff=01;35:*.png=01;35:*.svg=01;35:*.svgz=01;35:*.mng=01;35:*.pcx=01;35:*.mov=01;35:*.mpg=01;35:*.mpeg=01;35:*.m2v=01;35:*.mkv=01;35:*.webm=01;35:*.ogm=01;35:*.mp4=01;35:*.m4v=01;35:*.mp4v=01;35:*.vob=01;35:*.qt=01;35:*.nuv=01;35:*.wmv=01;35:*.asf=01;35:*.rm=01;35:*.rmvb=01;35:*.flc=01;35:*.avi=01;35:*.fli=01;35:*.flv=01;35:*.gl=01;35:*.dl=01;35:*.xcf=01;35:*.xwd=01;35:*.yuv=01;35:*.cgm=01;35:*.emf=01;35:*.ogv=01;35:*.ogx=01;35:*.aac=00;36:*.au=00;36:*.flac=00;36:*.m4a=00;36:*.mid=00;36:*.midi=00;36:*.mka=00;36:*.mp3=00;36:*.mpc=00;36:*.ogg=00;36:*.ra=00;36:*.wav=00;36:*.oga=00;36:*.opus=00;36:*.spx=00;36:*.xspf=00;36:
LESSCLOSE=/usr/bin/lesspipe %s %s
TERM=xterm-256color
LESSOPEN=| /usr/bin/lesspipe %s
USER=root
DISPLAY=:0
SHLVL=1
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin
SUDO_UID=1000
MAIL=/var/mail/root
_=./shell
#cisfun$ ls -l /tmp
total 288
drwx------ 2 root root   4096 Feb 14 10:08 ssh-4cGwSJWFRXvH
drwx------ 2 root root   4096 Jan  6 16:15 tmp3369n8mv
-rw------- 1 root root 286370 Jan  6 16:36 tmpbwy3oj5v
#cisfun$ exit
root@HP:/alx-SE/simple_shell#

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