-Allowed editors: vi , vim , emacs ...
-All files will be compiled on Ubuntu 20.04 LTS using gcc, using the options -Wall -Werror -Wextra -pedantic -std=gnu89
-Beautifully written betty compliant code
access (man 2 access) chdir (man 2 chdir) close (man 2 close) closedir (man 3 closedir) execve (man 2 execve) exit (man 3 exit) _exit (man 2 _exit) fflush (man 3 fflush) fork (man 2 fork) free (man 3 free) getcwd (man 3 getcwd) getline (man 3 getline) getpid (man 2 getpid) isatty (man 3 isatty) kill (man 2 kill) 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 (__xstat) (man 2 stat) lstat (__lxstat) (man 2 lstat) fstat (__fxstat) (man 2 fstat) strtok (man 3 strtok) wait (man 2 wait) waitpid (man 2 waitpid) wait3 (man 2 wait3) wait4 (man 2 wait4) write (man 2 write)
----- Simple shell 0.0 ----- Write a UNIX command line interpreter.
Usage: simple_shell Your Shell should:
Display a prompt and wait for the user to type a command. A command line always ends with a new line. The prompt is displayed again each time a command has been executed. The command lines are simple, no semicolons, no pipes, no redirections or any other advanced features. The command lines are made only of one word. No arguments will be passed to programs. If an executable cannot be found, print an error message and display the prompt again. Handle errors. You have to handle the “end of file” condition (Ctrl+D) You don’t have to:
use the PATH implement built-ins handle special characters : ", ', `, , *, &, # be able to move the cursor handle commands with arguments execve will be the core part of your Shell, don’t forget to pass the environ to it…
----- Simple shell 0.1 + ----- Handle command lines with arguments
----- Simple shell 0.2 + ----- Handle the PATH fork must not be called if the command doesn’t exist
----- Simple shell 0.3 + ----- Implement the exit built-in, that exits the shell Usage: exit You don’t have to handle any argument to the built-in exit
----- Simple shell 0.4 + ----- Implement the env built-in, that prints the current environment
----- Simple shell 0.1 + ----- Write your own getline function Use a buffer to read many chars at once and call the least possible the read system call You will need to use static variables You are not allowed to use getline You don’t have to:
be able to move the cursor
----- Simple shell 0.2 + ----- You are not allowed to use strtok
----- Simple shell 0.4 + ----- Handle arguments for the built-in exit Usage: exit status, where status is an integer used to exit the shell
----- Simple shell 1.0 + ------ Implement the setenv and unsetenv builtin commands
setenv Initialize a new environment variable, or modify an existing one Command syntax: setenv VARIABLE VALUE Should print something on stderr on failure unsetenv Remove an environment variable Command syntax: unsetenv VARIABLE Should print something on stderr on failure
In order to meet with the requirements of this project, a few functions had to be created. The functions are as follows: _f_ok _getline _eof _realloc _strtok _strcmp _strlen _strchr _strcpy _strdup _strncmp