Simple Shell

A re-creation of a UNIX shell using C.

NOTE: Add a picture here!

Examples

Please follow Download and Run Instructions below for initial setup. When inside the shell, you can:

Run an executable:

$ /bin/ls

Run an executable found in the $PATH environment variable:

$ ls

Run a shell built-in:

$ printenv

To find all built-ins, run the manual:

$ man ./man_1_simple_shell

Download and Run Instructions

Clone Repo:

$ git clone https://github.com/guptaNswati/simple_shell.git

Compile:

$ gcc -Wall -Werror -Wextra -pedantic *.c ./tests/prompt-main.c -o simple_shell

Run the Executable:

$ ./simple_shell

Requirements for this project

• All files will be compiled on Ubuntu 14.04 LTS
• Programs and functions will be compiled with gcc 4.8.4 using the flags -Wall, -Werror, -Wextra, and -pedantic
• Code should comply with Betty style.
• No more than 5 functions per file.
• All header files should be include guarded.
• List of allowed functions and system calls:
  • access (man 2 access)
  • chdir (man 2 chdir)
  • close (man 2 close)
  • closedir (man 3 closedir)
  • execve (man 2 execve)
  • exit (man 3 exit)
  • fork (man 2 fork)
  • free (man 3 free)
  • fstat (man 2 fstat)
  • getcwd (man 3 getcwd)
  • getline (man 3 getline)
  • kill (man 2 kill)
  • lstat (man 2 lstat)
  • malloc (man 3 malloc)
  • open (man 2 open)
  • opendir (man 3 opendir)
  • perror (man 3 perror)
  • read (man 2 read)
  • readdir (man 3 readdir)
  • signal (man 2 signal)
  • stat (man 2 stat)
  • strtok (man 3 strtok) - advanced task recreate
  • wait (man 2 wait)
  • waitpid (man 2 waitpid)
  • wait3 (man 2 wait3)
  • wait4 (man 2 wait4)
  • write (man 2 write)
  • _exit (man 2 _exit)

File Descriptions

• shell.h: Header file which contains any library includes, structs created, and all function prototypes.
• prompt.c: Main shell file which prints and asks for prompt from User, creates tokens from User input, and runs executable or returns response if no executable found.
• get-line.c: Contains a rewrite of function getline and a tokenize function to split apart strings by delimiters.
• env-get-set.c: All functions related to environment variables. Functions include ability to Get, Set, Unset, Print, Check.
• builtins.c: Functions to handle built-in commands and checking commands via PATH environment variable.
• string-funcs.c: Helper functions that handle strings, include copy, compare, tokenize/parse, and concatenate.
• string-funcs2.c: More helper functions.
• memory.c: Functions to handle memory allocation and frees.
• cd.c: Shell built-in change directory command.
• alias.c: Functions to handle alias built-in command.
• aliasFunc.c: Contains a helper function to handle aliases.
• hstry.c: Functions to handle history built-in and storing history of inputted commands in an external parent directory.
• help.c: Functions to handle help built-in.
• duplict-parse.c: Helper functions for parsing and deep duping.

Team

Swati Gupta - Github || Twitter

Philip Yoo - Github || Twitter