diff --git a/smem b/smem
index 0412d9d..c3dfe68 100755
--- a/smem
+++ b/smem
@@ -1,5 +1,5 @@
 #!/usr/bin/python
-import re, os, sys, pwd, grp, optparse
+import re, os, sys, pwd, grp, optparse, errno
 
 def pids():
     '''get a list of processes'''
@@ -113,10 +113,9 @@ def showpids():
 
     fields = dict(
         pid=('PID', lambda n: n, '% 5s', lambda x: len(p)),
-        uid=('UID', username, '%-5s', None),
-        user=('User', showuser, '%-8s', None),
+        user=('User', showuser, '%-8s', lambda x: len(dict.fromkeys(x))),
         name=('Name', pidname, '%-24.24s', None),
-        command=('Command', pidcmd, '%-24.24s', None),
+        command=('Command', pidcmd, '%-27.27s', None),
         swap=('Swap',lambda n: pt[n]['swap'], '% 8s', sum),
         uss=('USS', lambda n: pt[n]['private_clean']
              + pt[n]['private_dirty'], '% 8s', sum),
@@ -147,7 +146,6 @@ def maptotals(pids):
                 totals[name] = t
         except:
             raise
-    print len(totals), totals.keys()[0]
     return totals
 
 def showmaps():
@@ -156,7 +154,7 @@ def showmaps():
 
     fields = dict(
         map=('Map', lambda n: n, '%-24.24s', len),
-        count=('Count', lambda n: pt[n]['count'], '% 8s', sum),
+        count=('Count', lambda n: pt[n]['count'], '% 5s', sum),
         swap=('Swap',lambda n: pt[n]['swap'], '% 8s', sum),
         uss=('USS', lambda n: pt[n]['private_clean']
              + pt[n]['private_dirty'], '% 8s', sum),
@@ -167,6 +165,51 @@ def showmaps():
 
     showtable(pt.keys(), fields, columns.split(), options.sort or 'pss')
 
+def usertotals(pids):
+    totals = {}
+    for pid in pids:
+        try:
+            maps = pidmaps(pid)
+        except:
+            raise
+        user = piduser(pid)
+        if user not in totals:
+            t = dict(size=0, rss=0, pss=0, shared_clean=0,
+                     shared_dirty=0, private_clean=0, count=0,
+                     private_dirty=0, referenced=0, swap=0)
+        else:
+            t = totals[user]
+
+        for m in maps.iterkeys():
+            for k in t:
+                t[k] += maps[m].get(k, 0)
+
+        t['count'] += 1
+        totals[user] = t
+    return totals
+
+def showusers():
+    p = pids()
+    pt = usertotals(p)
+
+    def showuser(p):
+        if options.numeric:
+            return p
+        return username(p)
+
+    fields = dict(
+        user=('User', showuser, '%-8s', None),
+        count=('Count', lambda n: pt[n]['count'], '% 5s', sum),
+        swap=('Swap',lambda n: pt[n]['swap'], '% 8s', sum),
+        uss=('USS', lambda n: pt[n]['private_clean']
+             + pt[n]['private_dirty'], '% 8s', sum),
+        rss=('RSS', lambda n: pt[n]['rss'], '% 8s', sum),
+        pss=('PSS', lambda n: pt[n]['pss'], '% 8s', sum),
+        )
+    columns = options.columns or 'user count swap uss pss rss'
+
+    showtable(pt.keys(), fields, columns.split(), options.sort or 'pss')
+
 def showtable(rows, fields, columns, sort):
     header = ""
     format = ""
@@ -180,7 +223,7 @@ def showtable(rows, fields, columns, sort):
         r = [fields[c][1](n) for c in columns]
         l.append((fields[sort][1](n), r))
 
-    l.sort()
+    l.sort(reverse=bool(options.reverse))
 
     if not options.no_header:
         print header
@@ -214,12 +257,22 @@ parser.add_option("-c", "--columns", type="str",
                   help="columns to show")
 parser.add_option("-m", "--mappings", action="store_true",
                   help="show mappings")
+parser.add_option("-u", "--users", action="store_true",
+                  help="show users")
+parser.add_option("-r", "--reverse", action="store_true",
+                  help="reverse sort")
 
 defaults = {}
 parser.set_defaults(**defaults)
 (options, args) = parser.parse_args()
 
-if options.mappings:
-    showmaps()
-else:
-    showpids()
+try:
+    if options.mappings:
+        showmaps()
+    elif options.users:
+        showusers()
+    else:
+        showpids()
+except IOError, e:
+    if e.errno == errno.EPIPE:
+        pass