initramfs: introduced a `wall` script

initramfs/bin_wall.sh

@@ -0,0 +1,32 @@
+#!/bin/sh
+# --- SDE-COPYRIGHT-NOTE-BEGIN ---
+# This copyright note is auto-generated by ./scripts/Create-CopyPatch.
+#
+# Filename: target/idunn/initramfs/bin_wall.sh
+# Copyright (C) 2008 The OpenSDE Project
+#
+# More information can be found in the files COPYING and README.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; version 2 of the License. A copy of the
+# GNU General Public License can be found in the file COPYING.
+# --- SDE-COPYRIGHT-NOTE-END ---
+
+tmpfile=/tmp/wall.$$
+
+trap "rm -f $tmpfile" INT
+
+cat <<EOT > $tmpfile
+Broadcast Message from $USER@$(hostname)
+	($(tty)) at $(date) ...
+EOT
+cat >> $tmpfile
+
+for x in /dev/pts/* /dev/vc/*; do
+	if [ -w "$x" ]; then
+		cat "$tmpfile" > "$x"
+	fi
+done
+
+rm -rf $tmpfile