new: [myc-update] add sysctl scripts installation facility

bin/myc-update

@@ -65,6 +65,13 @@ ln -sfn /opt/apps/myc-manage/etc/cron.d/* /etc/cron.d/
 find -L /etc/cron.d -maxdepth 1 -type l -ilname /opt/apps/myc-manage/etc/cron.d/\* -delete
 EOF
 
+Wrap -d "Updating sysctl scripts" <<EOF || exit 1
+for d in /etc/sysctl.d; do
+    ln -sfn "/opt/apps/myc-manage\$d/"* "\$d/" &&
+    find -L "\$d" -maxdepth 1 -type l -ilname "/opt/apps/myc-manage\$d/"\* -delete
+done
+EOF
+
 if [ -f "/root/.bashrc" ]; then
     Wrap -d "Enable colors in bash" <<'EOF' || exit 1
 sed -ri 's/^# (export LS_OPTIONS=.--color=auto.)/\1/;