diff --git a/coreutils/chmod.c b/coreutils/chmod.c
index 1ce1cb6..3c9a894 100644
--- a/coreutils/chmod.c
+++ b/coreutils/chmod.c
@@ -6,13 +6,13 @@
 #include <sys/stat.h>
 #include "make_path.h"
 #include "get_stat.h"
+#include "parse_mode.h"
 
 int (*get_stat)(const char *prog_name, const char *path, struct stat *stat_path);
 unsigned int r_flag;
 unsigned int s_flag;
 mode_t mode;
 
-
 int change(const char *file) {
 	struct stat old_file;
 	if (get_stat("chmod", file, &old_file))
@@ -74,13 +74,6 @@ int chtree(const char *dst) {
 	return ret;
 }
 
-void parse_mode(const char *arg){
-	char *p;
-	mode = strtol(arg, &p, 8);
-	if (*p)
-		return;
-}
-
 int main(int argc, char **argv) {
 	int i;
 
@@ -99,17 +92,20 @@ int main(int argc, char **argv) {
 			get_stat = mu_get_stat;
 
 		else if (!strcmp(argv[i], "--help")) {
-			printf("chmod [-H if a command line argument is a symbolic link] [-r recursive] [-s silent] [file1 file2...]\n");
+			printf("chmod [-H if a command line argument is a symbolic link] [-r recursive] [-s silent] [ugoa]{+|-|=}[rwxXst] / [sstrwxrwxrwx] [file1 file2...]\n");
 			return 0;
 		}
+
+		if (argc - i <= 2)
+			break;
 	}
 
-	if (argc - i - 1 <= 0) {
+	if (argc - i < 1) {
 		fprintf(stderr, "chmod: missing operand\n");
 		return 1;
 	}
 
-	parse_mode(argv[i]);
+	mode = mu_parse_mode(argv[i]);
 	argv++;
 	argc--;
 
diff --git a/coreutils/cp.c b/coreutils/cp.c
index 95b7366..44e0fd1 100644
--- a/coreutils/cp.c
+++ b/coreutils/cp.c
@@ -122,6 +122,8 @@ int cptree(const char *src, const char *dst) {
 		return 1;
         }
 
+	int ret = 0;
+
 	struct dirent *ep;
 	while ((ep = readdir(dir)) != NULL) {
 		if (!strcmp(ep->d_name, ".") || !strcmp(ep->d_name, "..") || !strcmp(dst, ep->d_name))
@@ -137,14 +139,15 @@ int cptree(const char *src, const char *dst) {
 			continue;
 		}
 
-		cptree(src_path, dst_path);
+		if (cptree(src_path, dst_path))
+			ret = 1;
 
 		free(src_path);
 		free(dst_path);
 	}
 
 	closedir(dir);
-	return 0;
+	return ret;
 }
 
 int main(const int argc, char **argv) {
diff --git a/coreutils/rm.c b/coreutils/rm.c
index c673f3e..e2e2905 100644
--- a/coreutils/rm.c
+++ b/coreutils/rm.c
@@ -30,6 +30,8 @@ int rmtree(const char *path) {
 		return 1;
 	}
 
+	int ret = 0;
+
 	struct dirent *ep;
 	while ((ep = readdir(dir)) != NULL) {
 		if (!strcmp(ep->d_name, ".") || !strcmp(ep->d_name, ".."))
@@ -39,7 +41,9 @@ int rmtree(const char *path) {
 		if (full_path == NULL)
 			continue;
 
-		rmtree(full_path);
+		if (rmtree(full_path))
+			ret = 1;
+
 		free(full_path);
 	}
 
@@ -48,7 +52,7 @@ int rmtree(const char *path) {
 		if (!f_flag)
 			fprintf(stderr, "rm: %s: can`t remove a directory\n", path);
 
-	return 0;
+	return ret;
 }
 
 int main(const int argc, char **argv) {
diff --git a/libmu/parse_mode.h b/libmu/parse_mode.h
new file mode 100644
index 0000000..ccdc43e
--- /dev/null
+++ b/libmu/parse_mode.h
@@ -0,0 +1,44 @@
+#ifndef _PARSE_MODE_H
+#define _PARSE_MODE_H
+
+#include <sys/stat.h>
+
+int mu_parse_mode(const char *s) {
+	char *p = NULL;
+	long mode = strtol(s, &p, 8);
+	if (!*p)
+		return mode;
+
+	int group = 0;
+	int other = 0;
+	int user = 0;
+
+	int i;
+	for (i = 0; s[i]; i++) {
+		switch (s[i]) {
+			case 'u':
+				user = 1;
+				break;
+
+			case 'g':
+				group = 1;
+				break;
+
+			case 'o':
+				other = 1;
+
+			case 'a':
+				group = 1;
+				other = 1;
+				user = 1;
+				break;
+
+			default:
+				break;
+		}
+	}
+
+	return mode;
+}
+
+#endif