diff --git a/builder/config.h b/builder/config.h
index 6ea443d..892e4df 100644
--- a/builder/config.h
+++ b/builder/config.h
@@ -10,6 +10,6 @@ const char *objects[] = {
 	/* "sysutils" */
 };
 
-#define CFLAGS "-Wall", "-Werror", "-Wextra", "-pedantic", "-flto", "-Os", "-s", "-I", "../libmu"
+#define CFLAGS "-Wall", "-Werror", "-Wextra", "-pedantic", "-flto", "-Os", "-s", "-I", "../libmu", "-I", "../"
 #define CC "cc"
 #endif
diff --git a/config.h b/config.h
new file mode 100644
index 0000000..f67bf55
--- /dev/null
+++ b/config.h
@@ -0,0 +1,14 @@
+#ifndef _CONFIG_H
+#define _CONFIG_H
+
+/* Depends: cat tee wc */
+#define BUF_SIZE 4096
+
+/* Random source for shred */
+#define RAND_SOURCE "/dev/urandom"
+
+/* Options. To disable, comment line */
+/* Add escape-char support in echo */
+#define ECHO_FANCY
+
+#endif
diff --git a/coreutils/cat.c b/coreutils/cat.c
index f18dca2..ace88a7 100644
--- a/coreutils/cat.c
+++ b/coreutils/cat.c
@@ -3,9 +3,10 @@
 #include <errno.h>
 #include <string.h>
 #include <unistd.h>
+#include "config.h"
 
 void cat(const int fd) {
-	char buf[4096];
+	char buf[BUF_SIZE + 1];
 	ssize_t len;
 
 	while ((len = read(fd, buf, sizeof(buf))) > 0)
diff --git a/coreutils/dirname.c b/coreutils/dirname.c
index ecb58f1..0b2f7e6 100644
--- a/coreutils/dirname.c
+++ b/coreutils/dirname.c
@@ -2,7 +2,6 @@
 #include <libgen.h>
 
 int main(const int argc, char **argv) {
-
 	if (argc <= 1) {
 		printf("dirname [dirname]\n");
 		return 1;
diff --git a/coreutils/echo.c b/coreutils/echo.c
index 1d3eaef..e067ef9 100644
--- a/coreutils/echo.c
+++ b/coreutils/echo.c
@@ -1,8 +1,10 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include "config.h"
 
 void format(char *str) {
+#ifdef ECHO_FANCY
 	for (size_t i = 0; i < strlen(str); i++) {
 		unsigned int c = str[i];
 		if (c == '\\') {
@@ -51,6 +53,11 @@ void format(char *str) {
 
 		putchar(c);
 	}
+
+#else
+	fputs(str, stdout);
+
+#endif
 }
 
 int main(int argc, char **argv) {
diff --git a/coreutils/ln.c b/coreutils/ln.c
index 0cedf81..154bfc5 100644
--- a/coreutils/ln.c
+++ b/coreutils/ln.c
@@ -20,7 +20,6 @@ int ln(const char *src, const char *dst) {
 }
 
 int main(int argc, char **argv) {
-
 	int opt;
 	while ((opt = getopt(argc, argv, "sf")) != -1) {
 		switch (opt) {
diff --git a/coreutils/shred.c b/coreutils/shred.c
index 82f8406..235b402 100644
--- a/coreutils/shred.c
+++ b/coreutils/shred.c
@@ -6,8 +6,7 @@
 #include <string.h>
 #include <sys/mman.h>
 #include <sys/stat.h>
-
-#define RAND_SOURCE "/dev/urandom"
+#include "config.h"
 
 unsigned int f_flag;
 unsigned int u_flag;
diff --git a/coreutils/tee.c b/coreutils/tee.c
index 3e67af9..c9c10c4 100644
--- a/coreutils/tee.c
+++ b/coreutils/tee.c
@@ -3,6 +3,7 @@
 #include <errno.h>
 #include <unistd.h>
 #include <stdlib.h>
+#include "config.h"
 
 int main(int argc, char **argv) {
 	int flag = O_TRUNC;
@@ -38,11 +39,11 @@ int main(int argc, char **argv) {
 	}
 
 
-	char in[4096];
+	char buf[BUF_SIZE + 1];
 	off_t bytes = 0;
-	while ((bytes = read(STDIN_FILENO, in, sizeof(in)))) {
-		write(STDOUT_FILENO, in, bytes);
-		write(fd, in, bytes);
+	while ((bytes = read(STDIN_FILENO, buf, sizeof(buf)))) {
+		write(STDOUT_FILENO, buf, bytes);
+		write(fd, buf, bytes);
 	}
 
 	close(fd);
diff --git a/coreutils/wc.c b/coreutils/wc.c
index 83ab93a..02d9caf 100644
--- a/coreutils/wc.c
+++ b/coreutils/wc.c
@@ -4,6 +4,7 @@
 #include <ctype.h>
 #include <unistd.h>
 #include <string.h>
+#include "config.h"
 
 /* cmd arguments l - lines c - bytes w - words */
 unsigned int l_flag;
@@ -20,7 +21,7 @@ unsigned int tbytes;
 unsigned int tlines;
 
 void count(const int fd) {
-	char buf[4096];
+	char buf[BUF_SIZE + 1];
 	off_t n = 0;
 
 	int in_word = 1;
diff --git a/coreutils/whoami.c b/coreutils/whoami.c
index f8880d5..0bee9cb 100644
--- a/coreutils/whoami.c
+++ b/coreutils/whoami.c
@@ -1,7 +1,6 @@
 #include <sys/types.h>
 #include <unistd.h>
 #include <pwd.h>
-
 #include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>