diff --git a/build.sh b/build.sh
index b1b5975..0e7b2b2 100755
--- a/build.sh
+++ b/build.sh
@@ -12,7 +12,7 @@ if [ -z $CC ]; then
 fi
 
 if [ -z $projects ]; then
-	projects="sysutils-linux init console-tools coreutils findutils networking miscutils shell loginutils procps"
+	projects="sysutils-linux init console-tools coreutils findutils networking loginutils procps"
 fi
 
 #Compile
@@ -29,7 +29,7 @@ for project in $projects; do
 			env CC=$CC CFLAGS="$CFLAGS -I$PROJECT_DIR -I$PROJECT_DIR/include/libmu" OUTPUT="$PROJECT_DIR"/bin/ ./build.sh
 			cd $PROJECT_DIR
 		done
-		echo
+		echo -n "\n"
 	done
 done
 
diff --git a/config.h b/config.h
index 3e62a81..1586e6d 100644
--- a/config.h
+++ b/config.h
@@ -2,7 +2,7 @@
 #define _CONFIG_H
 
 /* (cat tee wc xargs rev split) */
-#define BUF_SIZE 4096
+#define BUF_SIZE 2048
 
 /* Random source (shred) */
 #define RAND_SOURCE "/dev/urandom"
@@ -35,10 +35,13 @@ char *INIT_START[] = {"/etc/rc.init", NULL};
 #endif
 
 /* Max args (xargs) */
-#define NARGS 1024
+#ifdef XARGS
+#include <limits.h>
+#define NARGS ARG_MAX
 
 /* Arg size (xargs) */
 #define ARG_SIZE 1024
+#endif
 
 /* Default cmd (xargs) */
 #define ECHO_CMD "echo"
diff --git a/src/coreutils/uname/uname.c b/src/coreutils/uname/uname.c
index fac26d2..f7bbd9d 100644
--- a/src/coreutils/uname/uname.c
+++ b/src/coreutils/uname/uname.c
@@ -100,7 +100,7 @@ int main(int argc, char **argv) {
 				break;
 
 			default:
-				printf("uname [asnrvmop]\n\t-a All\n\t-s Sys]\n\t-n Nodename\n\t-r Release\n\t-v Version\n\t-m Machine\n\t-o Os name\n");
+				printf("uname [asnrvmop]\n\t-a All\n\t-s Sys\n\t-n Nodename\n\t-r Release\n\t-v Version\n\t-m Machine\n\t-o Os name\n");
 				return 0;
 		}
 	}
diff --git a/src/findutils/xargs/xargs.c b/src/findutils/xargs/xargs.c
index 6bcffce..100153c 100644
--- a/src/findutils/xargs/xargs.c
+++ b/src/findutils/xargs/xargs.c
@@ -1,14 +1,18 @@
+#define XARGS
 #include <stdio.h>
 #include <errno.h>
 #include <string.h>
 #include <stdlib.h>
 #include <unistd.h>
-#include <ctype.h>
+#include <signal.h>
 #include <sys/wait.h>
+#include <ctype.h>
 #include "config.h"
 
+char *I_flag;
 char t_flag;
 char r_flag;
+char nl_flag;
 int n_flag;
 int s_flag;
 int P_flag;
@@ -22,6 +26,13 @@ enum {
 	QUOTE
 };
 
+enum {
+	NORMAL,
+	CEOF,
+	ERROR,
+	I_FLAG
+};
+
 void clear_cmd(void) {
 	for (int i = 0; i < args; i++)
 		if (cmd[i] != NULL)
@@ -30,20 +41,36 @@ void clear_cmd(void) {
 	args = 0;
 }
 
-int add_arg(const char *str, int chars) {
+int add_arg(const char *str, int chars, int flag) {
 	if (args >= NARGS)
-		return 1;
+		return ERROR;
 
 	else if (n_flag > 0 && args > n_flag)
-		return 1;
+		return ERROR;
 
 	else if (s_flag > 0 && chars > s_flag)
-		return 1;
+		return ERROR;
+
+	if (!flag && I_flag) {
+		for (int i = 0; i < args; i++)
+			if (!strcmp(cmd[i], I_flag))
+				cmd[i] = strdup(str);
+
+		return I_FLAG;
+	}
 
 	cmd[args] = strdup(str);
 	args++;
 
-	return 0;
+	return NORMAL;
+}
+
+int is_correct(char c) {
+	if (nl_flag)
+		return c == '\0';
+
+	else
+		return isspace(c);
 }
 
 int stdin_read(void) {
@@ -55,32 +82,37 @@ int stdin_read(void) {
 	int chars = 0;
 	int args_passed = 0;
 
-	int ret = 0;
+	int ret = NORMAL;
 	char flag = NONE;
 	while (1) {
 		int c = getchar();
 		if (c == EOF) {
 			if (flag == QUOTE) {
 				fprintf(stderr, "xargs: unterminated double quote\n");
-				ret = 2;
+				ret = ERROR;
 			}
 
 			if (p != arg)
 				goto PUSH;
 
-			ret = 1;
+			ret = CEOF;
 			break;
 		}
 
 		/* Place str */
-		else if ((flag == NONE && isspace(c) && strlen(arg) > 0) || p + 1 == arg + sizeof(arg)) {
+		else if ((flag == NONE && is_correct(c) && strlen(arg) > 0) || p == arg + sizeof(arg) - 1) {
 PUSH:
+
 			*p = '\0';
 			p = arg;
 
-			if (add_arg(arg, chars))
+			int r = add_arg(arg, chars, 0);
+			if (r == ERROR)
 				break;
 
+			else if (r == I_FLAG)
+				return NORMAL;
+
 			args_passed++;
 		}
 
@@ -106,11 +138,18 @@ PUSH:
 	}
 
 	if (args_passed == 0)
-		ret = 1;
+		ret = CEOF;
 
 	return ret;
 }
 
+/* Run */
+void sig_handler(int sig) {
+	if (sig == SIGUSR1)
+		if (P_flag2)
+			P_flag2--;
+}
+
 int run(void) {
 	if (t_flag) {
 		for (int i = 0; i < args; i++)
@@ -153,9 +192,10 @@ void check(int val) {
 }
 
 int main(int argc, char **argv) {
+	signal(SIGUSR1, sig_handler);
 
 	int opt;
-	while ((opt = getopt(argc, argv, "tn:s:rP:")) != -1) {
+	while ((opt = getopt(argc, argv, "tn:s:rP:0I:")) != -1) {
 		switch (opt) {
 			case 't':
 				t_flag = 1;
@@ -180,8 +220,16 @@ int main(int argc, char **argv) {
 				check(P_flag);
 				break;
 
+			case '0':
+				nl_flag = 1;
+				break;
+
+			case 'I':
+				I_flag = optarg;
+				break;
+
 			default:
-				printf("xargs [tnsr] [cmd [arg1] [arg2...]\n\t-t Print the command before start\n\t-n Pass no more than N args\n\t-r Don't run command if input is empty\n\t-s Pass command line of no more than N bytes\n\t-P Run up to N PROGs in parallel\n");
+				printf("xargs [tnsrP0I] [cmd [arg1] [arg2...]\n\t-t Print the command before start\n\t-n Pass no more than N args\n\t-r Don't run command if input is empty\n\t-s Pass command line of no more than N bytes\n\t-P Run up to N PROGs in parallel\n\t-0 NUL terminated input\n\t-I STR Replace STR within PROG ARGS with input line\n");
 				return 0;
 		}
 	}
@@ -195,12 +243,12 @@ int main(int argc, char **argv) {
 		/* Arg */
 		if (argc) {
 			for (int i = 0; i < argc; i++)
-				if (add_arg(argv[i], 0))
+				if (add_arg(argv[i], 0, 1))
 					break;
 		}
 
 		else
-			add_arg(ECHO_CMD, 0);
+			add_arg(ECHO_CMD, 0, 1);
 
 		/* Stdin */
 		int stdin_stat = stdin_read();
@@ -215,12 +263,12 @@ int main(int argc, char **argv) {
 		}
 
 		/* Run */
-		if (stdin_stat == 1) {
+		if (stdin_stat == CEOF && I_flag == NULL) {
 			if (!r_flag)
 				ret = spawn();
 		}
 
-		else if (stdin_stat == 0)
+		else if (stdin_stat == NORMAL)
 			ret = spawn();
 
 		/* Clear */
diff --git a/src/procps/kill/kill.c b/src/procps/kill/kill.c
index 47361b6..fbce6f5 100644
--- a/src/procps/kill/kill.c
+++ b/src/procps/kill/kill.c
@@ -35,7 +35,7 @@ SIG signals[] = {
 
 int parse_sig(char *arg) {
 	int sig = atoi(arg);
-	if (sig >= 0 && sig <= NSIG)
+	if (sig > 0 && sig <= NSIG)
 		return sig;
 
 	if (!strncasecmp(arg, "SIG", 3))
diff --git a/src/shell/rc/build.sh b/src/shell/rc/build.sh
deleted file mode 100755
index f72abe8..0000000
--- a/src/shell/rc/build.sh
+++ /dev/null
@@ -1,3 +0,0 @@
-#!/bin/sh
-echo ./*.c $CFLAGS -o rc | xargs $CC
-mv rc $OUTPUT/sh
diff --git a/src/shell/rc/rc.c b/src/shell/rc/rc.c
deleted file mode 100644
index ca29686..0000000
--- a/src/shell/rc/rc.c
+++ /dev/null
@@ -1,252 +0,0 @@
-#include <fcntl.h>
-#include <stdio.h>
-#include <errno.h>
-#include <string.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <signal.h>
-#include <sys/wait.h>
-#include "unused.h"
-
-#define TOK_DELIM " \t\r\n\a"
-
-typedef struct {
-	char *name;
-	char *val;
-} ALIAS;
-ALIAS *aliases;
-size_t aliases_size;
-
-unsigned int exit_flag;
-
-int rc_alias(char **args);
-int rc_exit(char **args);
-int rc_cd(char **args);
-
-/* Builtin commands */
-char *cmd[] = {"cd", "exit", "alias"};
-int (*func[])(char **args) = {rc_cd, rc_exit, rc_alias};
-
-int rc_alias(char **args) {
-	/* Print all aliases */
-	if (args[0] == NULL) {
-		for (size_t i = 0; i < aliases_size; i++)
-			printf("alias %s=\"%s\"\n", aliases[i].name, aliases[i].val);
-
-		return 0;
-	}
-
-	char *val = strchr(args[0], '=');
-	if (val == NULL) {
-		fprintf(stderr, "rc: syntax error\n");
-		return 1;
-	}
-
-	val[0] = '\0';
-
-	/* Check is exist */
-	for (size_t i = 0; i < aliases_size; i++)
-		if (!strcmp(args[0], aliases[i].name))
-			return 0;
-
-	aliases_size++;
-	aliases = realloc(aliases, sizeof(ALIAS) * aliases_size);
-	if (aliases == NULL) {
-		fprintf(stderr, "rc: realloc failed\n");
-		exit_flag = 1;
-		return 1;
-	}
-
-	val++;
-	aliases[aliases_size - 1].name = malloc(strlen(args[0]) + 1);
-	aliases[aliases_size - 1].val = malloc(strlen(val) + 1);
-	if (aliases[aliases_size - 1].name == NULL || aliases[aliases_size - 1].val == NULL) {
-		fprintf(stderr, "rc: malloc failed\n");
-		exit_flag = 1;
-		return 1;
-	}
-
-	sprintf(aliases[aliases_size - 1].name, "%s", args[0]);
-	sprintf(aliases[aliases_size - 1].val, "%s", val);
-
-	return 0;
-}
-
-int rc_exit(char **args) {
-	UNUSED(args);
-
-	exit_flag = 1;
-	return 0;
-}
-
-int rc_cd(char **args) {
-	int status = 0;
-	if (args[0] == NULL)
-		status = chdir(getenv("HOME"));
-
-	else
-		status = chdir(args[0]);
-
-	if (status < 0) {
-		fprintf(stderr, "rc: cd: Not such directory\n");
-		return 1;
-	}
-
-	return 0;
-}
-
-/* Shell */
-int execute(char **tok) {
-	if (tok[0] == NULL)
-		return 0;
-
-	for (size_t i = 0; i < sizeof(cmd) / sizeof(char *); i++)
-		if (!strcmp(tok[0], cmd[i]))
-			return func[i](tok + 1);
-
-	for (size_t i = 0; i < aliases_size; i++)
-		if (!strcmp(tok[0], aliases[i].name))
-			tok[0] = aliases[i].val;
-
-	/* If its not builtin cmd */
-	pid_t pid;
-	if ((pid = fork()) == 0) {
-		if (pid == 1)
-			exit(1);
-
-		if (execvp(tok[0], tok) == -1)
-			fprintf(stderr, "rc: %s: unknow command\n", tok[0]);
-
-		exit(1);
-	}
-
-	if (pid == -1) {
-		fprintf(stderr, "rc: fork failed\n");
-		return 1;
-	}
-
-	int status = 0;
-	waitpid(pid, &status, 0);
-	return status;
-}
-
-char **tokenize(char *str) {
-	size_t buflen = 1;
-
-	char *p = str;
-	while (*p++)
-		if (*p == ' ')
-			buflen++;
-
-	char **tokens = malloc(sizeof(char *) * (buflen + 1));
-	if (tokens == NULL) {
-		fprintf(stderr, "rc: malloc failed\n");
-		return NULL;
-	}
-
-	char *token = strtok(str, TOK_DELIM);
-
-	int i = 0;
-	while (token != NULL) {
-		tokens[i] = token;
-		token = strtok(NULL, TOK_DELIM);
-		i++;
-	}
-
-	tokens[i] = NULL;
-	return tokens;
-}
-
-char *readline(FILE *fp) {
-	char *str = NULL;
-	size_t len = 0;
-	if (getline(&str, &len, fp) == -1)
-		return NULL;
-
-	return str;
-}
-
-void catch_sig(int sig) {
-	UNUSED(sig);
-
-	putchar('\n');
-	return;
-}
-
-int main(int argc, char **argv) {
-	signal(SIGINT, catch_sig);
-
-	/* Alias */
-	aliases = malloc(sizeof(ALIAS));
-	if (aliases == NULL) {
-		fprintf(stderr, "rc: malloc failed\n");
-		return 1;
-	}
-
-	int opt;
-	while ((opt = getopt(argc, argv, "l")) != -1) {
-		switch (opt) {
-			case 'l':
-				break;
-
-			default:
-				printf("rc [l] [script]\n\t-l UNUSED\n");
-				return 0;
-		}
-	}
-
-	argv += optind;
-	argc -= optind;
-
-	unsigned int script_flag = 0;
-
-	FILE *fp = stdin;
-	if (argc == 1) {
-		fp = fopen(argv[0], "r");
-		if (fp == NULL) {
-			fprintf(stderr, "rc: %s: %s\n", argv[0], strerror(errno));
-			return 1;
-		}
-
-		script_flag = 1;
-	}
-
-	while (!exit_flag) {
-		if (!script_flag) {
-			printf("> ");
-			fflush(stdout);
-		}
-
-		char *str = readline(fp);
-		if (str == NULL)
-			break;
-
-		char **tok = tokenize(str);
-		if (tok == NULL) {
-			free(str);
-			continue;
-		}
-
-		int status = execute(tok);
-		if (status)
-			setenv("status", "1", 1);
-
-		else
-			setenv("status", "0", 1);
-
-		free(tok);
-		free(str);
-	}
-
-	for (size_t i = 0; i < aliases_size; i++) {
-		free(aliases[i].name);
-		free(aliases[i].val);
-	}
-
-	free(aliases);
-	if (script_flag)
-		fclose(fp);
-
-	putchar('\n');
-	return 0;
-}