diff --git a/task.c b/task.c
index 7845cf9..b876f2d 100644
--- a/task.c
+++ b/task.c
@@ -9,7 +9,7 @@
 // - Organização por prioridade
 // - Data limite
 
-// --- Global values - Don't use it, them is just for easy edits ---
+// --- Global values --- 
 
 // directories (begin with nothing)
 char* DATA_DIR = ".local/share/task-cli";
@@ -19,17 +19,108 @@ char* CONFIG_DIR = ".config/task-cli";
 char* TASK_FILE = "task.txt";
 
 
-int main()     
+int main(int argc, char* argv[])     
 {     
+	if (argc < 2) {
+		printf("Commands:\n\tadd <task>: add a new task.\n\tread: read all the tasks.\n\tdone <index>: mark a task as done.\n");
+        	return 1;
+    	}
+
 	char* DEF_DATA_DIR = get_dir(home(), DATA_DIR);
 	char* DEF_CONFIG_DIR = get_dir(home(), CONFIG_DIR);
 	
 	char* DEF_TASK_FILE = get_file(DEF_DATA_DIR, TASK_FILE);
-
-	printf("DEF_DATA_DIR: %s\n", DEF_DATA_DIR);
-	printf("DEF_CONFIG_DIR: %s\n", DEF_CONFIG_DIR);
-	printf("DEF_TASK_FILE: %s\n", DEF_TASK_FILE);
 	
+	FILE *task_f;
+
+	if (strcmp(argv[1], "add") == 0) {
+	
+		task_f = fopen(DEF_TASK_FILE, "a+");
+		if (!task_f) {
+			printf("error.");
+			return 1;
+		}
+		
+		rewind(task_f);
+		int lines = 0;
+		char buffer[256];
+		while (fgets(buffer, sizeof(buffer), task_f)) {
+		    lines++;
+		}
+
+		char* new_task = argv[2];
+		
+		if (lines == 0) {
+			fprintf(task_f, " [ ] %s", new_task);
+		} else {
+			fprintf(task_f, "\n [ ] %s", new_task);
+		}
+
+		fclose(task_f);
+	
+	} else if (strcmp(argv[1], "read") == 0) {
+
+		task_f = fopen(DEF_TASK_FILE, "r");
+		if (!task_f) {
+			printf("error.");
+			return 1;
+		}
+	
+		int lines = 0;
+		char buffer[256];
+		while (fgets(buffer, sizeof(buffer), task_f)) {
+			printf("%d. %s", lines, buffer);
+			lines++;
+		}
+		rewind(task_f);
+	
+		printf("\n");
+		fclose(task_f);
+
+	} else if (strcmp(argv[1], "done") == 0) {
+		
+		task_f = fopen(DEF_TASK_FILE, "r");
+		if (!task_f) {
+			printf("error."); // im too lazy, ill do a better error message later.
+			return 1;
+		}
+
+		char *endptr;
+		long index = strtol(argv[2], &endptr, 10); // 10 = decimal base 
+		
+		if (*endptr != '\0') {
+		    printf("Error: '%s' is not a valid number \n", argv[2]);
+		} 
+		
+		int lines = 0;
+		char buffer[256];
+		while (fgets(buffer, sizeof(buffer), task_f)) {
+		    lines++;
+		}
+		rewind(task_f);
+
+		char **array = malloc(lines * sizeof(char*));
+		int n = 0;
+
+		while (fgets(buffer, sizeof(buffer), task_f)) {
+		    array[n] = strdup(buffer);
+		    n++;
+		}
+		fclose(task_f);
+
+		if (index < 0 || index >= n) {
+			printf("Error: task %ld does not exist", index);
+			return 1;
+		}
+
+		task_f = fopen(DEF_TASK_FILE, "w");
+		for (int i = 0; i < n; i++) {
+		    	if (i != index) fputs(array[i], task_f);
+			free(array[i]);
+		}
+		fclose(task_f);
+	}
+
 	free(DEF_DATA_DIR);
 	free(DEF_CONFIG_DIR);
 	free(DEF_TASK_FILE);