maybe_a_shell.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

int main() {
	for (;;) {
		char* line = NULL;
		size_t cap;
		ssize_t sz;
		printf("> ", stdout);
		if ((sz = getline(&line, &cap, stdin)) < 1)
			break;
		line[sz-1] = '\0';
		char* rest = line,* tok = line;
		char* args[256] = {0};
		for (size_t i = 0; i < 255 && (tok = strsep(&rest, " ")); i++)
			args[i] = tok;
		if (!fork())
			execvp(args[0], args);
		wait(NULL);
		free(line);
	}
}