diff --git a/bin/ls/cmp.c b/bin/ls/cmp.c
index 84fb03881937..872966611766 100644
--- a/bin/ls/cmp.c
+++ b/bin/ls/cmp.c
@@ -78,7 +78,10 @@ modcmp(const FTSENT *a, const FTSENT *b)
 	if (b->fts_statp->st_mtim.tv_nsec <
 	    a->fts_statp->st_mtim.tv_nsec)
 		return (-1);
-	return (strcoll(a->fts_name, b->fts_name));
+        if (f_samesort)
+		return (strcoll(b->fts_name, a->fts_name));
+        else
+		return (strcoll(a->fts_name, b->fts_name));
 }
 
 int
@@ -104,7 +107,10 @@ acccmp(const FTSENT *a, const FTSENT *b)
 	if (b->fts_statp->st_atim.tv_nsec <
 	    a->fts_statp->st_atim.tv_nsec)
 		return (-1);
-	return (strcoll(a->fts_name, b->fts_name));
+        if (f_samesort)
+		return (strcoll(b->fts_name, a->fts_name));
+        else
+		return (strcoll(a->fts_name, b->fts_name));
 }
 
 int
@@ -130,7 +136,10 @@ birthcmp(const FTSENT *a, const FTSENT *b)
 	if (b->fts_statp->st_birthtim.tv_nsec <
 	    a->fts_statp->st_birthtim.tv_nsec)
 		return (-1);
-	return (strcoll(a->fts_name, b->fts_name));
+        if (f_samesort)
+		return (strcoll(b->fts_name, a->fts_name));
+        else
+		return (strcoll(a->fts_name, b->fts_name));
 }
 
 int
@@ -156,7 +165,10 @@ statcmp(const FTSENT *a, const FTSENT *b)
 	if (b->fts_statp->st_ctim.tv_nsec <
 	    a->fts_statp->st_ctim.tv_nsec)
 		return (-1);
-	return (strcoll(a->fts_name, b->fts_name));
+        if (f_samesort)
+		return (strcoll(b->fts_name, a->fts_name));
+        else
+		return (strcoll(a->fts_name, b->fts_name));
 }
 
 int
diff --git a/bin/ls/ls.1 b/bin/ls/ls.1
index cc5ff482187b..aa4fc1860d1d 100644
--- a/bin/ls/ls.1
+++ b/bin/ls/ls.1
@@ -32,7 +32,7 @@
 .\"     @(#)ls.1	8.7 (Berkeley) 7/29/94
 .\" $FreeBSD$
 .\"
-.Dd September 28, 2011
+.Dd November 8, 2012
 .Dt LS 1
 .Os
 .Sh NAME
@@ -40,7 +40,7 @@
 .Nd list directory contents
 .Sh SYNOPSIS
 .Nm
-.Op Fl ABCFGHILPRSTUWZabcdfghiklmnopqrstuwx1
+.Op Fl ABCFGHILPRSTUWZabcdfghiklmnopqrstuwxy1,
 .Op Fl D Ar format
 .Op Ar
 .Sh DESCRIPTION
@@ -130,6 +130,8 @@ This option is equivalent to defining
 .Ev CLICOLOR
 in the environment.
 (See below.)
+This functionality can be compiled out by removing the definition of
+.Ev COLORLS .
 .It Fl H
 Symbolic links on the command line are followed.
 This option is assumed if
@@ -249,12 +251,35 @@ subsection below, except (if the long format is not also requested)
 the directory totals are not output when the output is in a
 single column, even if multi-column output is requested.
 .It Fl t
-Sort by time modified (most recently modified
-first) before sorting the operands in lexicographical
-order.
+Sort by descending time modified (most recently modified first).  If two files
+have the same modification timestamp, sort their names in ascending
+lexicographical order.
+The
+.Fl r
+option reverses both of these sort orders.
+.Pp
+Note that these sort orders are contradictory: the time sequence is in
+descending order, the lexicographical sort is in ascending order.
+This behavior is mandated by
+.St -p1003.2 .
+This feature can cause problems listing files stored with sequential names on
+FAT file systems, such as from digital cameras, where it is possible to have
+more than one image with the same timestamp.
+In such a case, the photos cannot be listed in the sequence in which
+they were taken.
+To ensure the same sort order for time and for lexicographical sorting, set the
+environment variable
+.Ev LS_SAMESORT
+or use the
+.Fl y
+option.
+This causes
+.Nm
+to reverse the lexicographal sort order when sorting files with the
+same modification timestamp.
 .It Fl u
 Use time of last access,
-instead of last modification
+instead of time of last modification
 of the file for sorting
 .Pq Fl t
 or printing
@@ -268,6 +293,15 @@ The same as
 .Fl C ,
 except that the multi-column output is produced with entries sorted
 across, rather than down, the columns.
+.It Fl y
+When the
+.Fl t
+option is set, sort the alphabetical output in the same order as the time output.
+This has the same effect as setting
+.Ev LS_SAMESORT .
+See the description of the
+.Fl t
+option for more details.
 .It Fl 1
 (The numeric digit
 .Dq one . )
@@ -275,6 +309,15 @@ Force output to be
 one entry per line.
 This is the default when
 output is not to a terminal.
+.It Fl ,
+(Comma) When the
+.Fl l
+option is set, print file sizes grouped and separated by thousands using the
+non-monetary separator returned by
+.Xr localeconv 3 ,
+typically a comma or period.
+If no locale is set, or the locale does not have a non-monetary separator, this
+option has no effect.
 .El
 .Pp
 The
@@ -529,7 +572,7 @@ variable is defined.
 .It Ev CLICOLOR_FORCE
 Color sequences are normally disabled if the output is not directed to
 a terminal.
-This can be overridden by setting this flag.
+This can be overridden by setting this variable.
 The
 .Ev TERM
 variable still needs to reference a color capable terminal however
@@ -655,6 +698,14 @@ Not all columns have changeable widths.
 The fields are,
 in order: inode, block count, number of links, user name,
 group name, flags, file size, file name.
+.It Ev LS_SAMESORT
+If this variable is set, the
+.Fl t
+option sorts the names of files with the same modification timestamp in the same
+sense as the time sort.
+See the description of the
+.Fl t
+option for more details.
 .It Ev TERM
 The
 .Ev CLICOLOR
@@ -678,6 +729,7 @@ specification.
 .Xr getfacl 1 ,
 .Xr sort 1 ,
 .Xr xterm 1 ,
+.Xr localeconv 3 ,
 .Xr strftime 3 ,
 .Xr strmode 3 ,
 .Xr termcap 5 ,
@@ -716,3 +768,9 @@ option description might be a feature that was
 based on the fact that single-column output
 usually goes to something other than a terminal.
 It is debatable whether this is a design bug.
+.Pp
+.St -p1003.2
+mandates opposite sort orders for files with the same timestamp when
+sorting with the
+.Fl t
+option.
diff --git a/bin/ls/ls.c b/bin/ls/ls.c
index 1fe1b96d893d..36b0669cc304 100644
--- a/bin/ls/ls.c
+++ b/bin/ls/ls.c
@@ -109,10 +109,11 @@ int termwidth = 80;		/* default terminal width */
        int f_humanval;		/* show human-readable file sizes */
        int f_inode;		/* print inode */
 static int f_kblocks;		/* print size in kilobytes */
+       int f_label;		/* show MAC label */
 static int f_listdir;		/* list actual directory, not contents */
 static int f_listdot;		/* list files beginning with . */
-static int f_noautodot;		/* do not automatically enable -A for root */
        int f_longform;		/* long listing format */
+static int f_noautodot;		/* do not automatically enable -A for root */
 static int f_nofollow;		/* don't follow symbolic link arguments */
        int f_nonprint;		/* show unprintables as ? */
 static int f_nosort;		/* don't sort output */
@@ -122,19 +123,21 @@ static int f_numericonly;	/* don't convert uid/gid to name */
        int f_octal_escape;	/* like f_octal but use C escapes if possible */
 static int f_recursive;		/* ls subdirectories also */
 static int f_reversesort;	/* reverse whatever sort is used */
-       int f_sectime;		/* print the real time for all files */
+       int f_samesort;		/* sort time and name in same direction */
+       int f_sectime;		/* print full time information */
 static int f_singlecol;		/* use single column output */
        int f_size;		/* list size in short listing */
+static int f_sizesort;
        int f_slash;		/* similar to f_type, but only for dirs */
        int f_sortacross;	/* sort across rows, not down columns */
        int f_statustime;	/* use time of last mode change */
 static int f_stream;		/* stream the output, separate with commas */
-static int f_timesort;		/* sort by time vice name */
+       int f_thousands;		/* show file sizes with thousands separators */
        char *f_timeformat;      /* user-specified time format */
-static int f_sizesort;
+static int f_timesort;		/* sort by time vice name */
        int f_type;		/* add type character for non-regular files */
 static int f_whiteout;		/* show whiteout entries */
-       int f_label;		/* show MAC label */
+
 #ifdef COLORLS
        int f_color;		/* add type in color for non-regular files */
 
@@ -180,8 +183,10 @@ main(int argc, char *argv[])
 	}
 
 	fts_options = FTS_PHYSICAL;
+	if (getenv("LS_SAMESORT"))
+		f_samesort = 1;
  	while ((ch = getopt(argc, argv,
-	    "1ABCD:FGHILPRSTUWZabcdfghiklmnopqrstuwx")) != -1) {
+	    "1ABCD:FGHILPRSTUWXZabcdfghiklmnopqrstuwxy,")) != -1) {
 		switch (ch) {
 		/*
 		 * The -1, -C, -x and -l options all override each other so
@@ -237,6 +242,9 @@ main(int argc, char *argv[])
 			f_sizesort = 0;
 			break;
                 /* Other flags.  Please keep alphabetic. */
+		case ',':
+			f_thousands = 1;
+			break;
 		case 'B':
 			f_nonprint = 0;
 			f_octal = 1;
@@ -338,6 +346,9 @@ main(int argc, char *argv[])
 			f_octal = 0;
 			f_octal_escape = 0;
 			break;
+		case 'y':
+			f_samesort = 1;
+			break;
 		default:
 		case '?':
 			usage();
@@ -850,6 +861,8 @@ display(const FTSENT *p, FTSENT *list, int options)
 			d.s_size = sizelen;
 		d.s_user = maxuser;
 	}
+        if (f_thousands)                        /* make space for commas */
+		d.s_size += (d.s_size - 1) / 3;
 	printfcn(&d);
 	output = 1;
 
diff --git a/bin/ls/ls.h b/bin/ls/ls.h
index ee2a7a5004bb..9a57de3e055c 100644
--- a/bin/ls/ls.h
+++ b/bin/ls/ls.h
@@ -49,11 +49,13 @@ extern int f_longform;		/* long listing format */
 extern int f_octal;		/* print unprintables in octal */
 extern int f_octal_escape;	/* like f_octal but use C escapes if possible */
 extern int f_nonprint;		/* show unprintables as ? */
+extern int f_samesort;          /* sort time and name in same direction */
 extern int f_sectime;		/* print the real time for all files */
 extern int f_size;		/* list size in short listing */
 extern int f_slash;		/* append a '/' if the file is a directory */
 extern int f_sortacross;	/* sort across rows, not down columns */
 extern int f_statustime;	/* use time of last mode change */
+extern int f_thousands;		/* show file sizes with thousands separators */
 extern char *f_timeformat;      /* user-specified time format */
 extern int f_notabs;		/* don't use tab-separated multi-col output */
 extern int f_type;		/* add type character for non-regular files */
diff --git a/bin/ls/print.c b/bin/ls/print.c
index 5a0fc86acde0..335d0e9d9011 100644
--- a/bin/ls/print.c
+++ b/bin/ls/print.c
@@ -606,7 +606,11 @@ printsize(size_t width, off_t bytes)
 		humanize_number(buf, sizeof(buf), (int64_t)bytes, "",
 		    HN_AUTOSCALE, HN_B | HN_NOSPACE | HN_DECIMAL);
 		(void)printf("%*s ", (u_int)width, buf);
-	} else
+	} else if (f_thousands) {               /* with commas */
+		/* This format assignment needed to work round gcc bug. */
+                const char *format = "%*j'd ";
+		(void)printf(format, (u_int)width, bytes);
+        } else
 		(void)printf("%*jd ", (u_int)width, bytes);
 }
 
diff --git a/bin/ls/util.c b/bin/ls/util.c
index ecb1732b851e..7fa6606abd5e 100644
--- a/bin/ls/util.c
+++ b/bin/ls/util.c
@@ -175,7 +175,7 @@ prn_octal(const char *s)
 	size_t clen;
 	unsigned char ch;
 	int goodchar, i, len, prtlen;
-	
+
 	memset(&mbs, 0, sizeof(mbs));
 	len = 0;
 	while ((clen = mbrtowc(&wc, s, MB_LEN_MAX, &mbs)) != 0) {
@@ -222,9 +222,9 @@ usage(void)
 {
 	(void)fprintf(stderr,
 #ifdef COLORLS
-	"usage: ls [-ABCFGHILPRSTUWZabcdfghiklmnopqrstuwx1] [-D format]"
+	"usage: ls [-ABCFGHILPRSTUWZabcdfghiklmnopqrstuwxy1,] [-D format]"
 #else
-	"usage: ls [-ABCFHILPRSTUWZabcdfghiklmnopqrstuwx1] [-D format]"
+	"usage: ls [-ABCFHILPRSTUWZabcdfghiklmnopqrstuwxy1,] [-D format]"
 #endif
 		      " [file ...]\n");
 	exit(1);