A simple minimal shell written in C. This simple C program reads a stream of input from the user, parses it, and forks a child process to execute the user's commands.
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Clone the repository:
git clone https://github.com/xshthkr/yass.git
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Navigate to the project directory and compile the source code:
cd yass make -
Run the compiled binary from the
binfolder:cd bin ./yass
Once YASS is running, you will see a prompt yass >. Enter commands as you normally would with any other shell. To exit the shell, type exit.
Commands are stored in the form of a struct. The struct command includes the name of the command, an array of arguments passed to the command, and the number of arguments passed.
The user input is read using the read_line() function. This function reads a line from stdin and reports errors if any.
The user input is then parsed and split into tokens separated by tabs, spaces, and newline delimiters. Memory is allocated for the arguments using malloc(), and if the arguments exceeds the buffer size, the buffer is dynamically expanded using realloc().
The command along with its arguments are executed by forking to create a child process using fork(). The child process is replaced by a process executing the command using execvp(). The parent process waits for the child process to finish executing before being ready to receive the next command using wait() to avoid zombie process.