diff --git a/contrib/assign0.awk b/contrib/assign0.awk
new file mode 100755
index 0000000..5045485
--- /dev/null
+++ b/contrib/assign0.awk
@@ -0,0 +1,30 @@
+#!/usr/bin/awk -f
+
+# Assign a new uid for users that have uid=0
+BEGIN {
+    FS=":";
+    max_uid = 0;
+    i = 0;
+}
+
+{
+    max_uid = ($3 > max_uid ? $3 : max_uid);
+    if ($3 == "0") {
+        uid0[i] = $0;
+    } else {
+        good[i] = $0;
+    }
+    i += 1;
+}
+
+END {
+    for (i in good) {
+        print good[i];
+    }
+
+    for (i in uid0) {
+        max_uid += 1;
+        split(uid0[i], f, ":");
+        print f[1]":"f[2]":"max_uid":"f[4]":"f[5]":"f[6]":"f[7];
+    }
+}
diff --git a/contrib/remove_dupe_gids.awk b/contrib/remove_dupe_gids.awk
new file mode 100755
index 0000000..dcfbb1f
--- /dev/null
+++ b/contrib/remove_dupe_gids.awk
@@ -0,0 +1,12 @@
+#!/usr/bin/awk -f
+#
+# Remove groups that have duplicate gids. The first group wins.
+BEGIN{ FS=":" }
+{
+    if ($3 in gids) {
+        print "duplicate gid="$3" name="$1", ignoring" > "/dev/stderr";
+        next;
+    }
+    gids[$3]=$0;
+    print $0;
+}