diff --git a/Makefile b/Makefile
index f7f7a71..81059e2 100644
--- a/Makefile
+++ b/Makefile
@@ -4,6 +4,7 @@ CC?=cc
 all:
 	$(CC) builder/builder.c $(CFLAGS) -obuild
 	./build
+	rm build
 
 clean:
 	rm bin/*
diff --git a/TODO b/TODO
index 5336dad..92b6c8b 100644
--- a/TODO
+++ b/TODO
@@ -1,6 +1,7 @@
 With "micro-" prefix
 
 *Todo:
+*nl
 tail
 expr
 uniq
diff --git a/coreutils/chgrp.c b/coreutils/chgrp.c
index 0649f07..821b343 100644
--- a/coreutils/chgrp.c
+++ b/coreutils/chgrp.c
@@ -10,18 +10,18 @@
 #include "recurse.h"
 
 unsigned int r_flag;
-char *f_flag;
+char *f_flag = "chgrp";
 unsigned int H_flag;
 
 int change(const char *path, void *p) {
 	struct group *grp = (struct group *)p;
 
 	struct stat stat_path;
-	if (mu_get_stat("chgrp", path, &stat_path))
+	if (mu_get_stat(f_flag, path, &stat_path))
 		return 1;
 
 	if (lchown(path, stat_path.st_uid, grp->gr_gid)) {
-		if (!f_flag)
+		if (f_flag)
 			fprintf(stderr, "chgrp: %s: %s\n", path, strerror(errno));
 
 		return 1;
@@ -40,7 +40,7 @@ int main(int argc, char **argv) {
 				break;
 
 			case 'f':
-				f_flag = "chgrp";
+				f_flag = NULL;
 				break;
 
 			case 'H':
@@ -63,14 +63,22 @@ int main(int argc, char **argv) {
 
 	struct group *grp = getgrnam(argv[0]);
 	if (!grp) {
-		fprintf(stderr, "chgrp: unknow group\n");
+		if (f_flag)
+			fprintf(stderr, "chgrp: unknow group\n");
+
 		return 1;
 	}
 
 	int ret = 0;
-	for (int i = 1; i < argc; i++)
-		if (mu_recurse(f_flag, H_flag, argv[i], (void *)grp, change, change))
-			ret = 1;
+	for (int i = 1; i < argc; i++) {
+		if (r_flag) {
+			if (mu_recurse(f_flag, H_flag, argv[i], (void *)grp, change, change))
+				ret = 1;
+		}
+
+		else
+			change(argv[i], grp);
+	}
 
 	return ret;
 }
diff --git a/coreutils/chmod.c b/coreutils/chmod.c
index 0b25ffb..d75fc6f 100644
--- a/coreutils/chmod.c
+++ b/coreutils/chmod.c
@@ -10,7 +10,7 @@
 #include "recurse.h"
 
 unsigned int r_flag;
-char *f_flag;
+char *f_flag = "chmod";
 unsigned int H_flag;
 
 int change(const char *file, void *p) {
@@ -22,7 +22,7 @@ int change(const char *file, void *p) {
 
 	mode_t mode = mu_parse_mode(mode_arg, old_file.st_mode);
 	if (chmod(file, mode) != 0) {
-		if (!f_flag)
+		if (f_flag)
 			fprintf(stderr, "chmod: unable to chown %s: %s\n", file, strerror(errno));
 
 		return 1;
@@ -54,7 +54,7 @@ int main(int argc, char **argv) {
 				break;
 
 			case 'f':
-				f_flag = "chmod";
+				f_flag = NULL;
 				break;
 
 			case 'H':
@@ -80,9 +80,15 @@ int main(int argc, char **argv) {
 		arg[0] = '-';
 
 	int ret = 0;
-	for (int i = 1; i < argc; i++)
-		if (mu_recurse(f_flag, H_flag, argv[i], argv[0], change, change))
-			ret = 1;
+	for (int i = 1; i < argc; i++) {
+		if (r_flag) {
+			if (mu_recurse(f_flag, H_flag, argv[i], argv[0], change, change))
+				ret = 1;
+		}
+
+		else
+			change(argv[i], argv[0]);
+	}
 
 	return ret;
 }
diff --git a/coreutils/chown.c b/coreutils/chown.c
index b1b7ba1..bb35c56 100644
--- a/coreutils/chown.c
+++ b/coreutils/chown.c
@@ -12,7 +12,7 @@
 #include "unused.h"
 
 unsigned int r_flag;
-char *f_flag;
+char *f_flag = "chown";
 unsigned int H_flag;
 int (*chown_func)(const char *pathname, uid_t owner, gid_t group);
 long gid;
@@ -21,7 +21,7 @@ long uid;
 int change(const char *file, void *p) {
 	UNUSED(p);
 	if (chown_func(file, uid, gid)) {
-		if (!f_flag)
+		if (f_flag)
 			fprintf(stderr, "chown: unable to chown %s: %s\n", file, strerror(errno));
 
 		return 1;
@@ -48,7 +48,7 @@ void get_owner(const char *arg) {
 
 		struct group *grp = getgrnam(group);
 		if (!grp) {
-			if (!f_flag)
+			if (f_flag)
 				fprintf(stderr, "chown: invalid group: %s\n", group);
 
 			exit(1);
@@ -60,7 +60,7 @@ void get_owner(const char *arg) {
 	if (u_flag) {
 		struct passwd *pwd = getpwnam(arg);
 		if (!pwd) {
-			if (!f_flag)
+			if (f_flag)
 				fprintf(stderr, "chown: invalid user: %s\n", arg);
 
 			exit(1);
@@ -81,7 +81,7 @@ int main(int argc, char **argv) {
 				break;
 
 			case 'f':
-				f_flag = "chmod";
+				f_flag = NULL;
 				break;
 
 			case 'H':
@@ -108,9 +108,15 @@ int main(int argc, char **argv) {
 	get_owner(argv[0]);
 
 	int ret = 0;
-	for (int i = 1; i < argc; i++)
-		if (mu_recurse(f_flag, H_flag, argv[i], NULL, change, change))
-			ret = 1;
+	for (int i = 1; i < argc; i++) {
+		if (r_flag) {
+			if (mu_recurse(f_flag, H_flag, argv[i], NULL, change, change))
+				ret = 1;
+		}
+
+		else
+			change(argv[i], NULL);
+	}
 
 	return ret;
 }
diff --git a/coreutils/cp.c b/coreutils/cp.c
index 0b8521c..47f534d 100644
--- a/coreutils/cp.c
+++ b/coreutils/cp.c
@@ -10,7 +10,7 @@
 #include "make_path.h"
 #include "get_stat.h"
 
-char *f_flag;
+char *f_flag = "cp";
 unsigned int r_flag;
 
 int write_buffer(int mode, int ifd, int ofd, const char *dst) {
@@ -84,7 +84,7 @@ int copy(int mode, const char *src, const char *dst) {
 	}
 
 	if (write_buffer(mode, ifd, ofd, new_path))
-		if (!f_flag)
+		if (f_flag)
 			fprintf(stderr, "cp: (%s %s) %s\n", src, dst, strerror(errno));
 
 
@@ -110,7 +110,7 @@ int cptree(const char *src, const char *dst) {
 
 	if (!S_ISDIR(stat_path.st_mode)) {
 		if (copy(stat_path.st_mode, src, dst)) {
-			if (!f_flag)
+			if (f_flag)
 				fprintf(stderr, "cp: (%s %s): copy() failed (%s)\n", src, dst, strerror(errno));
 
 			return 1;
@@ -123,7 +123,7 @@ int cptree(const char *src, const char *dst) {
 		return 0;
 
 	else if (mkdir(dst, 0777) < 0)
-		if (!f_flag)
+		if (f_flag)
 			fprintf(stderr, "cp: %s\n", strerror(errno));
 
 	DIR *dir = opendir(src);
@@ -165,7 +165,7 @@ int main(int argc, char **argv) {
 	while ((opt = getopt(argc, argv, "frR")) != -1) {
 		switch (opt) {
 			case 'f':
-				f_flag = "cp";
+				f_flag = NULL;
 				break;
 
 			case 'r':
diff --git a/coreutils/ls.c b/coreutils/ls.c
index d6bff48..df54ba8 100644
--- a/coreutils/ls.c
+++ b/coreutils/ls.c
@@ -252,7 +252,8 @@ void col_print(struct d_node **node, size_t files, struct winsize w) {
 	/* Mc print */
 	for (size_t i = 0; i < nrows; i++) {
 		for (size_t j = 0; j < ncols; j++) {
-			if (i * ncols + j < files) {
+			size_t index = j * nrows + i;
+			if (index < files) {
 				if (col > 0) {
 					nexttab -= col;
 					col += nexttab;
@@ -261,7 +262,7 @@ void col_print(struct d_node **node, size_t files, struct winsize w) {
 				}
 
 				nexttab = col + (int)maxlen;
-				col += print(node[i * ncols + j]);
+				col += print(node[index]);
 			}
 		}
 
diff --git a/coreutils/mv.c b/coreutils/mv.c
index 2bae2f9..333f9ff 100644
--- a/coreutils/mv.c
+++ b/coreutils/mv.c
@@ -6,13 +6,14 @@
 #include <stdlib.h>
 #include <unistd.h>
 #include "make_path.h"
+char *f_flag = "mv";
 
 int move(const char *src, const char *dst) {
 	char *copy = strdup(src);
 	if (!copy)
 		return 1;
 
-	char *new_path = mu_make_path("mv", dst, basename(copy));
+	char *new_path = mu_make_path(f_flag, dst, basename(copy));
 	if (new_path == NULL) {
 		free(copy);
 		return 1;
@@ -29,13 +30,11 @@ int move(const char *src, const char *dst) {
 }
 
 int main(int argc, char **argv) {
-	unsigned int f_flag = 0;
-
 	int opt;
 	while ((opt = getopt(argc, argv, "f")) != -1) {
 		switch (opt) {
 			case 'f':
-				f_flag = 1;
+				f_flag = NULL;
 				break;
 
 			default:
@@ -51,7 +50,7 @@ int main(int argc, char **argv) {
 	for (int i = 0; i < argc - 1; i++) {
 		if (rename(argv[i], argv[argc - 1]) < 0) {
 			if (move(argv[i], argv[argc - 1])) {
-				if (!f_flag)
+				if (f_flag)
 					fprintf(stderr, "mv: %s %s\n", argv[i], strerror(errno));
 
 				return 1;
diff --git a/coreutils/nl.c b/coreutils/nl.c
index 4866b87..b84f4bf 100644
--- a/coreutils/nl.c
+++ b/coreutils/nl.c
@@ -16,13 +16,15 @@ int nl(const char *path) {
 		fp = fopen(path, "r");
 
 	if (fp == NULL) {
-		fprintf(stderr, "rev: %s: %s\n", path, strerror(errno));
+		fprintf(stderr, "nl: %s: %s\n", path, strerror(errno));
 		return 1;
 	}
 
 	char buf[BUF_SIZE + 1];
 	while (fgets(buf, sizeof(buf), fp)) {
-		if (strlen(buf) > 1)
+		size_t len = strlen(buf);
+
+		if (len > 1)
 			fprintf(stdout, "%*u\t%s", w_flag, lines++, buf);
 
 		else
diff --git a/coreutils/nohup.c b/coreutils/nohup.c
index 94c0aa8..9681faa 100644
--- a/coreutils/nohup.c
+++ b/coreutils/nohup.c
@@ -12,6 +12,9 @@ int main(int argc, char **argv) {
 		return 1;
 	}
 
+	if (fork() != 0)
+		return 0;
+
 	signal(SIGHUP, SIG_IGN);
 
 	if (isatty(STDOUT_FILENO)) {
diff --git a/coreutils/rm.c b/coreutils/rm.c
index 5b476c7..8262de8 100644
--- a/coreutils/rm.c
+++ b/coreutils/rm.c
@@ -9,14 +9,14 @@
 #include "recurse.h"
 #include "unused.h"
 
-char *f_flag;
+char *f_flag = "rm";
 unsigned int r_flag;
 
 int rm(const char *path, void *p) {
 	UNUSED(p);
-	if (unlink(path) < 0) {
-		if (!f_flag)
-			fprintf(stderr, "rm: %s: is not directory\n", path);
+	if (remove(path) < 0) {
+		if (f_flag)
+			fprintf(stderr, "rm: %s: %s\n", path, strerror(errno));
 
 		return 1;
 	}
@@ -27,8 +27,8 @@ int rm(const char *path, void *p) {
 int rmd(const char *path, void *p) {
 	UNUSED(p);
 	if (rmdir(path) < 0) {
-		if (!f_flag)
-			fprintf(stderr, "rm: %s: is not directory\n", path);
+		if (f_flag)
+			fprintf(stderr, "rm: %s: %s\n", path, strerror(errno));
 
 		return 1;
 	}
@@ -41,7 +41,7 @@ int main(int argc, char **argv) {
 	while ((opt = getopt(argc, argv, "frR")) != -1) {
 		switch (opt) {
 			case 'f':
-				f_flag = "rm";
+				f_flag = NULL;
 				break;
 
 			case 'r':
@@ -71,13 +71,14 @@ int main(int argc, char **argv) {
 		}
 
 
-		if (!r_flag) {
-			if (rm(argv[i], NULL))
+		if (r_flag) {
+			if (mu_recurse(f_flag, 1, argv[i], NULL, rm, rmd))
 				ret = 1;
 		}
 
-		else if (mu_recurse(f_flag, 1, argv[i], NULL, rm, rmd))
-			ret = 1;
+		else
+			if (rm(argv[i], NULL))
+				ret = 1;
 	}
 
 	return ret;
diff --git a/findutils/xargs.c b/findutils/xargs.c
index 110408a..44da7a4 100644
--- a/findutils/xargs.c
+++ b/findutils/xargs.c
@@ -96,6 +96,10 @@ int run(void) {
 }
 
 int main(int argc, char **argv) {
+	for (int i = 0; i < argc; i++)
+		if (argv[i][0] == '-')
+			argc--;
+
 	int opt;
 	while ((opt = getopt(argc, argv, "tn:r")) != -1) {
 		switch (opt) {