diff --git a/TODO b/TODO
index 8f9e382..7c5f761 100644
--- a/TODO
+++ b/TODO
@@ -49,6 +49,6 @@ BUGS:
 	xargs (getopt with glibc)
 
 FIX:
- ps
+ ps (proc_parser.h)
  echo (escape)
  que (unicode)
diff --git a/include/libmu/proc_parser.h b/include/libmu/proc_parser.h
new file mode 100644
index 0000000..e3743d5
--- /dev/null
+++ b/include/libmu/proc_parser.h
@@ -0,0 +1,16 @@
+#ifndef _PROC_PARSER
+#define _PROC_PARSER
+
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <pwd.h>
+
+struct {
+	char *cmdline;
+	char state;
+	long nice;
+} mu_proc;
+
+#endif
diff --git a/src/coreutils/readlink/readlink.c b/src/coreutils/readlink/readlink.c
index aa3ea88..4b96bc4 100644
--- a/src/coreutils/readlink/readlink.c
+++ b/src/coreutils/readlink/readlink.c
@@ -26,7 +26,7 @@ int main(int argc, char **argv) {
 
 	for (int i = 0; i < argc; i++) {
 		char path[PATH_MAX + 1];
-		ssize_t r = readlink(argv[i], path, sizeof(path));
+		ssize_t r = readlink(argv[i], path, sizeof(path) - 1);
 		if (r < 0) {
 			fprintf(stderr, "readlink: %s: %s\n", argv[i], strerror(errno));
 			return 1;
@@ -37,6 +37,8 @@ int main(int argc, char **argv) {
 			return 1;
 		}
 
+		path[r] = '\0';
+
 		if (n_flag)
 			fputs(path, stdout);
 
diff --git a/src/coreutils/yes/build.sh b/src/coreutils/yes/build.sh
deleted file mode 100755
index 6d8974b..0000000
--- a/src/coreutils/yes/build.sh
+++ /dev/null
@@ -1,3 +0,0 @@
-#!/bin/sh
-project_dir=$(pwd)
-echo ./*.c $CFLAGS -o $OUTPUT$(basename $project_dir) | xargs $CC
diff --git a/src/coreutils/yes/yes.c b/src/coreutils/yes/yes.c
deleted file mode 100644
index 2e07bef..0000000
--- a/src/coreutils/yes/yes.c
+++ /dev/null
@@ -1,24 +0,0 @@
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-
-void print(const char *buf, ssize_t len) {
-	if (write(STDOUT_FILENO, buf, len) < 0)
-		exit(1);
-}
-
-int main(const int argc, const char **argv) {
-	if (argc == 1)
-		while (1)
-			print("y\n", 2);
-
-	while (1) {
-		for (ssize_t i = 1; i < argc; i++) {
-			print(argv[i], strlen(argv[i]));
-			print(" ", 1);
-		}
-
-		print("\n", 1);
-	}
-}
diff --git a/src/procps/ps/ps.c b/src/procps/ps/ps.c
index cc0b88d..3d6f43b 100644
--- a/src/procps/ps/ps.c
+++ b/src/procps/ps/ps.c
@@ -6,63 +6,102 @@
 #include <dirent.h>
 #include <limits.h>
 #include <errno.h>
-
-int open_file(const char *path) {
-	int fd = open(path, O_RDONLY);
-	if (fd < 0) {
-		fprintf(stderr, "ps: %s: %s\n", path, strerror(errno));
-		return -1;
-	}
-
-	return fd;
-}
+#include <ctype.h>
+#include <pwd.h>
 
 int pscan(const char *pid) {
 	char path[PATH_MAX + 1];
-	char cmdline[PATH_MAX + 1];
 
 	/* Arguments */
-	snprintf(path, sizeof(path), "/proc/%s/cmdline", pid);
-	int fd = open_file(path);
-	if (fd == -1)
+	snprintf(path, sizeof(path), "/proc/%s/status", pid);
+	int fd = open(path, O_RDONLY);
+	if (fd < 0) {
+		fprintf(stderr, "ps: %s: %s\n", path, strerror(errno));
 		return 1;
+	}
+
+	char status[2048];
+	ssize_t n = read(fd, status, sizeof(status) - 1);
+	status[n] = '\0';
 
-	read(fd, cmdline, sizeof(cmdline));
 	close(fd);
 
-	printf("%5s  %5s\n", pid, cmdline);
+	char *prog = "none";
+	char *state = "none";
+	char *user = "none";
+
+	/* Parsing */
+	char *token = strtok(status, "\n");
+	while (token) {
+		char *val = strchr(token, ':');
+		if (val == NULL) {
+			fprintf(stderr, "ps: incorrect %s file\n", path);
+			return 1;
+		}
+
+		*val = '\0';
+		val++;
+
+		/* Strip */
+		while (isspace(*val))
+			val++;
+
+		/* Write values */
+		if (!strncmp(token, "State", 5))
+			state = val;
+
+		else if (!strncmp(token, "Name", 4))
+			prog = val;
+
+		else if (!strncmp(token, "Uid", 3)) {
+			struct passwd *pw = getpwuid(atoi(val));
+			if (pw != NULL)
+				user = pw->pw_name;
+		}
+
+		token = strtok(NULL, "\n");
+	}
+
+	printf("%s\t%s\t%s\t%s\n", pid, state, user, prog);
 	return 0;
 }
 
 int main(int argc, char **argv) {
 
 	int opt;
-	while ((opt = getopt(argc, argv, "o:")) != -1) {
-		switch (opt) {
-			case 'o':
-				break;
-
-			default:
-				printf("ps [o] [PID]\n\t-o Options (nice, tty, cmd, pid, nice)\n");
-				return 0;
-		}
+	while ((opt = getopt(argc, argv, "")) != -1) {
+		puts("ps [PID]");
+		return 0;
 	}
 
-	DIR *dp = opendir("/proc");
-	if (dp == NULL) {
-		fprintf(stderr, "ps: /proc: %s\n", strerror(errno));
-		return 1;
-	}
+	argv += optind;
+	argc -= optind;
 
-	printf("PID    CMD\n");
+	printf("PID\tSTATE\tUSER\tCMD\n");
 
 	int ret = 0;
-	struct dirent *ep;
-	while ((ep = readdir(dp)) != NULL)
-		if (atoi(ep->d_name))
-			if (pscan(ep->d_name))
-				ret = 1;
+	if (argc == 0) {
+		DIR *dp = opendir("/proc");
+		if (dp == NULL) {
+			fprintf(stderr, "ps: /proc: %s\n", strerror(errno));
+			return 1;
+		}
+
+		struct dirent *ep;
+		while ((ep = readdir(dp)) != NULL)
+			if (atoi(ep->d_name))
+				if (pscan(ep->d_name))
+					ret = 1;
+
+		closedir(dp);
+	}
+
+	else {
+		for (int i = 0; i < argc; i++)
+			if (atoi(argv[i]))
+				if (pscan(argv[i]))
+					ret = 1;
+	}
 
-	closedir(dp);
 	return ret;
 }