This is a simple implementation of command-line interpreter for the Unix operating system created by holberton students Nildiert Jimenez and Ricardo Gutierrez.
See Unix Shell
- Who designed and implemented the original Unix operating system.
- Who wrote the first version of the UNIX shell
- Who invented the B programming language (the direct predecessor to the C programming language).
- Who is Ken Thompson.
- How does a shell work .
- What is a pid and a ppid.
- How to manipulate the environment of the current process.
- What is the difference between a function and a system call.
- How to create processes.
- What are the three prototypes of main.
- How does the shell use the PATH to find the programs.
- How to execute another program with the execve system call.
- How to suspend the execution of a process until one of its children terminates.
- What is EOF / “end-of-file”?
- All your files will be compiled on Ubuntu 14.04 LTS.
- Your C programs and functions will be compiled with gcc 4.8.4 using the flags -Wall -Werror -Wextra and -pedantic.
- All your files should end with a new line.
- Your code should use the Betty style.
- No more than 5 functions per file.
- All your header files should be include guarded.
- Use system calls only when you need to.
| File | Description |
|---|---|
| README.md | README file |
| cmd_utils.c | Functions of previous projects |
| error_handler.c | Management errors |
| exec.c | File that execute the functions of the OS system |
| exec_buil_comm.c | File that execute the builtins functions |
| exit.c | Function of exit |
| find_path.c | Find the path |
| fork.c | Create a new proccess |
| history.c | Create a history and add nodes |
| man_1_simple_shell | manpage |
| parser.c | Split the input |
| prompt.c | Receives the string of characters |
| shell.c | Content the main function |
| shell.h | Header file |
| stat.c | Verify the status of a command in the system |
| utils.c | Strings functions |
simple_shell is installed by running the following commands in your terminal.
git clone https://github.com/kyeeh/simple_shell.git
After that simple_shell can compile using
gcc -Wall -Werror -Wextra -pedantic *.c -o simple_shell
To start, write the following:
./simple_shell
When the shell reads the entry, it proceeds through a sequence of operations.
ls -la
In general terms, the shell reads your entry and divides it into words and operators
| ls | -la |
|---|
The shell then analyzes these tokens in commands and other constructs, redirects the input and output as needed, executes the specified command, waits for the output state of the command, and makes that output status available. for further inspection or processing.
total 88
drwxrwxr-x 3 vagrant vagrant 4096 Apr 12 18:35 .
drwxr-xr-x 10 vagrant vagrant 4096 Apr 12 18:35 ..
drwxrwxr-x 8 vagrant vagrant 4096 Apr 12 18:35 .git
-rw-rw-r-- 1 vagrant vagrant 7 Apr 7 23:28 .gitignore~
-rw-rw-r-- 1 vagrant vagrant 28 Apr 7 23:07 README.md
-rw-rw-r-- 1 vagrant vagrant 806 Apr 12 12:26 error_handler.c
-rw-rw-r-- 1 vagrant vagrant 304 Apr 12 12:26 exec.c
-rw-rw-r-- 1 vagrant vagrant 749 Apr 12 12:26 fork.c
-rwxrwxr-x 1 vagrant vagrant 13639 Apr 10 21:27 hsh
-rw-rw-r-- 1 vagrant vagrant 806 Apr 12 12:26 prompt.c
-rw-rw-r-- 1 vagrant vagrant 513 Apr 12 12:26 read_line.c
-rw-rw-r-- 1 vagrant vagrant 827 Apr 12 12:26 shell.c
-rw-rw-r-- 1 vagrant vagrant 680 Apr 12 12:26 shell.h
-rw-rw-r-- 1 vagrant vagrant 258 Apr 12 12:26 stat.c
-rwxrwxr-x 1 vagrant vagrant 13966 Apr 12 12:26 test
-rw-rw-r-- 1 vagrant vagrant 161 Apr 12 12:26 util.c
| Function | Description | Usage |
|---|---|---|
| env | Show the environment variables | To show the environment variables |
$ cat test_ls_2
/bin/ls
/bin/ls
$ cat test_ls_2 | ./hsh
hsh main.c shell.c test_ls_2
- 12-Apr-2019 Creation