🐧 Project simple_shell 🐧

Description

The simple shell is the standard command interpreter for the system. It is a command that reads lines from either a file or the terminal, interprets them, and generally executes other commands.

List of allowed functions and sysem 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)
• _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)
• printf (man 3 printf)
• fprintf (man 3 fprintf)
• vfprintf (man 3 vfprintf)
• sprintf (man 3 sprintf)
• putchar (man 3 putchar)
• 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)

Requirements

• All files will be compiled on Ubuntu 20.04 LTS
• All files should end with a new line
• A README.md file, at the root of the folder of the project is mandatory
• Code should use the Betty style. It will be checked using betty-style.pl and betty-doc.pl
• Shell should not have any memory leaks
• No more than 5 functions per file
• All header files should be include guarded
• Check memory leaks: valgrind ./simple_shell

Compilation

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

Man page execution

man ./man_1_simple_shell

Project functions

• shell.h header file
• read_line.c read the command from the standard input
• split_string.c tokenize the string
• exec_cmd.c execute the command
• environ.c:
  • _getenv.c get environment variable
  • split_env.c tokenize environ
  • print_env print the environment
• _path.c find the path
• exit_shell exit the shell
• functionc_str.c:
  • _strdup duplicate string
  • _strcat concatenate two string
  • _strlen calculate the length of the string
  • _strcpy copy the string
  • _strcmp compare two string
• main.c call the other functions to make run

Return value

This function has no return value.

Examples

Interactive mode

root@user:/holbertonschool-simple_shell# ./simple_shell
😈 /bin/ls
AUTHORS    exec_cmd.c  functions_str.c  man_1_simple_shell  read_line.c  shell.h       split_string.c
environ.c  _exit.c     main.c           path.c              README.md    simple_shell

😈 /bin/pwd
/holbertonschool-simple_shell

😈 /bin/ls -l
total 68
-rw-r--r-- 1 root root   130 Dec  2 00:33 AUTHORS
-rw-r--r-- 1 root root  1096 Dec  8 06:24 environ.c
-rw-r--r-- 1 root root   649 Dec  8 01:15 exec_cmd.c
-rw-r--r-- 1 root root   122 Dec  8 04:50 _exit.c
-rw-r--r-- 1 root root  1811 Dec  8 06:02 functions_str.c
-rw-r--r-- 1 root root   664 Dec  8 05:59 main.c
-rw-r--r-- 1 root root   696 Dec  8 07:04 man_1_simple_shell
-rw-r--r-- 1 root root   569 Dec  8 01:32 path.c
-rw-r--r-- 1 root root   340 Dec  8 05:47 read_line.c
-rw-r--r-- 1 root root  1484 Dec  2 00:41 README.md
-rw-r--r-- 1 root root   628 Dec  8 04:48 shell.h
-rwxr-xr-x 1 root root 18112 Dec  8 05:57 simple_shell
-rw-r--r-- 1 root root   465 Dec  8 06:03 split_string.c

😈 exit
root@user:/holbertonschool-simple_shell#

Non interactive mode

root@user:/holbertonschool-simple_shell# echo "/bin/ls" | ./simple_shell
AUTHORS    exec_cmd.c  functions_str.c  man_1_simple_shell  read_line.c  shell.h       split_string.c
environ.c  _exit.c     main.c           path.c              README.md    simple_shell

Authors

Anne-Laure Guilloux and Claudia Bura