Adding who, chroot, env and split.

Thanks "Galos, David" <galosd83@students.rowan.edu>!

who.c

@@ -0,0 +1,37 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <time.h>
+#include <utmpx.h>
+#include "util.h"
+
+static void usage(void);
+
+int
+main(int argc, char **argv)
+{
+	struct utmpx *ut;
+	time_t t;
+	char timebuf[sizeof "yyyy-mm-dd hh:mm"];
+
+	if(argc!=1)
+		usage();
+
+	while((ut=getutxent())) {
+		if(ut->ut_type != USER_PROCESS)
+			continue;
+		t = ut->ut_tv.tv_sec;
+		strftime(timebuf, sizeof timebuf, "%Y-%m-%d %H:%M", localtime(&t));
+		printf("%-8s %-12s %-16s\n", ut->ut_user, ut->ut_line, timebuf);
+	}
+	endutxent();
+	return 0;
+}
+
+void 
+usage(void)
+{
+	eprintf("usage: who\n");
+}
+