standardize some error messages

* maint.mk: (sc_error_message_warn_fatal, sc_error_message_uppercase):
(sc_error_message_period): Add automatic checks for non-standard error
messages.
* .x-sc_error_message_uppercase: explicit exclusion for this check
* src/cp.c: Standardize some error messages.
* src/date.c: Likewise.
* src/dircolors.c: Likewise.
* src/du.c: Likewise.
* src/expr.c: Likewise.
* src/install.c: Likewise.
* src/join.c: Likewise.
* src/ln.c: Likewise.
* src/mv.c: Likewise.
* src/od.c: Likewise.
* src/pr.c: Likewise.
* src/split.c: Likewise.
* src/truncate.c: Likewise.
* src/wc.c: Likewise.
* tests/du/files0-from: Expect new error message.
* tests/misc/join: Likewise.
* tests/misc/split-a: Likewise.
* tests/misc/wc-files0-from: Likewise.
* tests/misc/xstrtol: Likewise.
* lib/xmemxfrm.c: Likewise.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/od.c b/src/od.c
index 3273ec2ee..4df8e7dae 100644
--- a/src/od.c
+++ b/src/od.c
@@ -1838,7 +1838,7 @@ it must be one character from [doxn]"),
 	{
 	  error (0, 0, _("extra operand %s"), quote (argv[optind + 1]));
 	  error (0, 0, "%s\n",
-		 _("Compatibility mode supports at most one file."));
+		 _("compatibility mode supports at most one file"));
 	  usage (EXIT_FAILURE);
 	}
     }