Ghetto implementation in C of native "ls" command in Unix. Compile and run with: gcc -o cmd cmd.c && ./cmd ls

cmd.c

#include <stdio.h>
#include <glob.h>
#include <string.h>

void ls () {
	glob_t glob_result;
	// Display all files by passing * to glob
	glob("*", GLOB_TILDE, NULL, &glob_result);
	// Iterate over the files in the current directory
	for (unsigned int i = 0; i < glob_result.gl_pathc; ++i) {
		// Print the file names, just like native ls command
		printf("%s\n", glob_result.gl_pathv[i]);
	}
}

int main(int argc, char *argv[])
{
	if (argc == 2) {
		// Do a string compare to check if argument is ls
		if (! strcmp(argv[1], "ls")) {
			ls();
		}
		// TODO: Add more possible arguments here
	}
	else if (argc > 2) {
		printf("Too many arguments supplied.");
		printf("This program only handles one argument.\n");
	}
	else {
		printf("Provide an argument, for example ls\n");
	}
	return 0;
}