0x15. C - Simple Shell

Description

Simple Shell is a command line interpreter that replicates the sh program on Linux.

It can take in simple commands to navigate the terminal, manipulate files, and execute programs.

Goal:

How a shell works and finds commands
Creating, forking and working with processes
Executing a program from another program
Handling dynamic memory allocation in a large program
Pair programming and team work
Building a test suite to check our own code

Compile and run

gcc -Wall -Werror -Wextra -pedantic *.c -o hsh

./hsh

Usage

Prints a prompt and waits for a command from the user
Creates a child process in which the command is checked
Checks for built-ins, aliases in the PATH, and local executable programs
The child process is replaced by the command, which accepts arguments
When the command is done, the program returns to the parent process and prints the prompt
The program is ready to receive a new command
To exit: press Ctrl-D or enter "exit" (with or without a status)
Works also in non interactive mode

Examples

$ /bin/ls

foo main.c coquille.c README.md tests croissant.c

$ pwd

/home/vagrant/simple_shell

$ ls -l

total 60

drwxrwxr-x 7 vagrant vagrant  4096 Apr  7 01:48 foo

-rw-rw-r-- 1 vagrant vagrant   148 Apr  7 00:00 main.c

-rwxrw-r-- 1 vagrant vagrant    28 Apr  7 15:35 coquille.c

$ baguette

./hsh: No such file or directory

$ echo "cat testfile" | ./hsh

This is a test file

Authors

Samuel Ssekizinvu

Github - Twitter - LinkedIn

I’m a full-stack developer with great experience and passion for coding and building plain interfaces.

I have a manic love for great high-loaded projects. Plus, I’m an easy-going person and fit in any team. I work remotely and save your budget on my workplace. So, if you have a complicated task, you’ve found the right person.

samuelkchris / simple_shell