Last Holbertonschool C programming language roject.
0x16. C Write a simple UNIX command interpreter. The shell is the command interpretor in an operating system such as Unix or GNU/Linux. It provides a computer user an interface to the Unix/GNU Linux system so that the user can run different commands or utilities/tools with some input data.
- Clone this repository
$ git clone https://github.com/mrdoomus/simple_shell.git
- Change directory to "simple_shell"
$ cd simple_shell
- Make use of the Makefile file by typing "make". This will compile and execute the shell.
$ make
If you're having problems with the Makefile, just copy and paste the following command, it will compile and execute the shell.
$ gcc shell.c -Wall -Werror -Wextra -pedantic _* -o shell && ./shell
First of all, the shell has two possible forms:
INTERACTIVE
Where the shell stays on a loop prompting the user's input, then executes it, after executing the output is shown and finally the shell goes back to prompting.
$ pwd
/home/vagrant/simple_shell
$
NON INTERACTIVE
Where the shell doesn't loop, it just executes the written command on echo and closing when finished.
$ echo "pwd" | ./shell
/home/vagrant/simple_shell
EXAMPLES (Interactive mode)
- Flags to commands
$ ls -la
drwxrwxr-x 3 vagrant vagrant 4096 Aug 27 03:09 .
drwxr-xr-x 8 vagrant vagrant 4096 Aug 27 03:09 ..
-rw-rw-r-- 1 vagrant vagrant 197 Aug 27 02:40 AUTHORS
-rw-rw-r-- 1 vagrant vagrant 1197 Aug 27 02:40 _builtins.c
-rw-rw-r-- 1 vagrant vagrant 832 Aug 27 02:40 _execute.c
-rw-rw-r-- 1 vagrant vagrant 367 Aug 27 02:40 _freegrid.c
-rw-rw-r-- 1 vagrant vagrant 319 Aug 27 02:40 _getline.c
drwxrwxr-x 8 vagrant vagrant 4096 Aug 27 02:40 .git
-rw-rw-r-- 1 vagrant vagrant 203 Aug 27 02:40 Makefile
-rw-rw-r-- 1 vagrant vagrant 1458 Aug 27 02:40 _pathfinder.c
-rw-rw-r-- 1 vagrant vagrant 1168 Aug 27 02:40 pathfinderSave.c
-rw-rw-r-- 1 vagrant vagrant 1593 Aug 27 03:09 README.md
-rwxrwxr-x 1 vagrant vagrant 23547 Aug 27 03:05 shell
-rw-rw-r-- 1 vagrant vagrant 2011 Aug 27 02:40 shell.c
-rw-rw-r-- 1 vagrant vagrant 736 Aug 27 02:40 shell.h
-rw-rw-r-- 1 vagrant vagrant 611 Aug 27 02:40 _splitline.c
-rw-rw-r-- 1 vagrant vagrant 334 Aug 27 02:40 _strcat.c
-rw-rw-r-- 1 vagrant vagrant 417 Aug 27 02:40 _strcmp.c
-rw-rw-r-- 1 vagrant vagrant 406 Aug 27 02:40 _strcpy.c
-rw-rw-r-- 1 vagrant vagrant 226 Aug 27 02:40 _strlen.c
-rw-rw-r-- 1 vagrant vagrant 514 Aug 27 02:40 _strstr.c
$
- Changing directory
$ cd -
/home/vagrant/
$ cd simple_shell
$ pwd
/home/vagrant/simple_shell
$
- Creating and deleting files
$ touch file1
$ ls
AUTHORS _freegrid.c pathfinderSave.c shell.h _strcpy.c
_builtins.c _getline.c README.md _splitline.c _strlen.c
_execute.c Makefile shell _strcat.c _strstr.c
file1 _pathfinder.c shell.c _strcmp.c
$ rm file1
$ ls
AUTHORS _freegrid.c _pathfinder.c shell _splitline.c _strcpy.c
_builtins.c _getline.c pathfinderSave.c shell.c _strcat.c _strlen.c
_execute.c Makefile README.md shell.h _strcmp.c _strstr.c
$
This is a table with the files and their respective description used to create the shell.
| File | Description |
|---|---|
| shell.c | Main function, selects if interactive or non interactive, also calls the other functions |
| shell.h | Header file, contains prototypes of every function used |
| _getline.c | Gets the user's input and returns the typed command |
| _splitline.c | Splits the command into arguments for processing |
| _pathfinder.c | Finds path of execution for first argument (command) if ir wasn't typed fully |
| _execute.c | Executes the the command and returns a status for continuing or stopping the main loop |
| _builtins.c | Special commands innate of thell, no need of pathfinding |
| _strcat.c | Concatenates one string into another _strcat(hello, world => helloworld) |
| _strcmp.c | Compares two strings and returns 0 if equals _strcmp(hello, hello => 0) |
| _strcpy.c | Copy one string into an empty pointer _strcpy(newName(empty), name(Camilo) => newName(Camilo)) |
| _strlen.c | Returns the number of chars (without null) of a string _strlen(name(Camilo) => 5) |
| Makefile | Compiles and executes the shell |
- 0.1 (28 | 08 | 2019) First version
Juan Alberto Londoño Hernández 870@holbertonschool.com (Juan pequeño)
Camilo José Villegas Jiménez 872@holbertonschool.com (DOOM)
ALL THE HOLBERTON ALUMNI, THANKS! <3