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diff --git a/UPDATING b/UPDATING
--- a/UPDATING
+++ b/UPDATING
@@ -28,6 +28,15 @@
at runtime, run "ln -s 'abort:false,junk:false' /etc/malloc.conf".)
20250403:
+ ps(1)'s '-U' option has been changed to select processes by their real
+ user IDs instead of their effective one, in accordance with POSIX and
+ the use case of wanting to list processes launched by some user, which
+ is expected to be more frequent than listing processes having the rights
+ of some user. This only affects the selection of processes whose real
+ and effective user IDs differ. After this change, ps(1)'s '-U' flag
+ behaves differently then in other BSDs but identically to that of
+ Linux's procps and illumos.
+
ps(1)'s default list of processes now comes from matching its effective
user ID instead of its real user ID with the effective user ID of all
processes, in accordance with POSIX. As ps(1) itself is not installed
diff --git a/bin/ps/ps.c b/bin/ps/ps.c
--- a/bin/ps/ps.c
+++ b/bin/ps/ps.c
@@ -349,20 +349,6 @@
*/
nselectors++;
break;
-#if 0
- case 'R':
- /*-
- * XXX - This un-standard option is still under
- * debate. This is what SUSv3 defines as
- * the `-U' option, and while it would be
- * nice to have, it could cause even more
- * confusion to implement it as `-R'.
- */
- add_list(&ruidlist, optarg);
- xkeep_implied = 1;
- nselectors++;
- break;
-#endif
case 'r':
sortby = SORTCPU;
break;
@@ -394,21 +380,34 @@
nselectors++;
break;
case 'U':
+ add_list(&ruidlist, optarg);
+ xkeep_implied = 1;
+ nselectors++;
+ break;
+ case 'u':
+#if 0
/*
- * POSIX says that '-U' should match on real user IDs,
- * not effective ones as we are doing here, which is
- * normally the behavior of option '-u' according to the
- * standard.
+ * POSIX's '-u' behavior.
+ *
+ * This has not been activated because:
+ * 1. Option '-U' is a substitute for most users, and
+ * those that care seem more likely to want to match
+ * on the real user ID to display all processes
+ * launched by some users.
+ * 2. '-u' has been a canned display on the BSDs for
+ * a very long time (POLA).
*/
add_list(&uidlist, optarg);
xkeep_implied = 1;
nselectors++;
break;
- case 'u':
+#else
+ /* Historical BSD's '-u'. */
parsefmt(ufmt, &varlist, 0);
sortby = SORTCPU;
_fmt = 1;
break;
+#endif
case 'v':
parsefmt(vfmt, &varlist, 0);
sortby = SORTMEM;

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