Added the Tips

MacOS-Spotlight-Tips.md

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+## Commands
+
+Disable the index:
+
+    mdutil -i off /
+
+Enable the index:
+
+    mdutil -i on /
+
+Erase the current Spotlight index:
+
+    mdutil -E /
+
+## Help
+
+    Usage: mdutil -pEsa -i (on|off) -d volume ...
+    	Utility to manage Spotlight indexes.
+    	-p             Publish metadata.
+    	-i (on|off)    Turn indexing on or off.
+    	-d             Disable Spotlight activity for volume (re-enable using -i on).
+    	-E             Erase and rebuild index.
+    	-s             Print indexing status.
+    	-a             Apply command to all volumes.
+    	-V vol         Apply command to all stores on the specified volume.
+    	-v             Display verbose information.
+    NOTE: Run as owner for network homes, otherwise run as root.
+
+## Sources:
+
+* http://developer.apple.com/library/mac/#documentation/Darwin/Reference/ManPages/man1/mdutil.1.html
+* http://www.mikesel.info/disable-spotlight/
+* http://osxdaily.com/2007/03/22/how-to-completely-disable-spotlight/
+
+## Special files:
+
+There is a thorough recent non-ai article here: https://eclecticlight.co/2024/07/09/excluding-folders-and-files-from-time-machine-spotlight-and-icloud-drive/
+
+### Special Files still working in Sequoia
+
+* Ending an file or folder in `.noindex` will disable indexing of the folder. Example `mkdir private-folder.noindex`. In former times it was .no_index, so beware the change. Similar is .nosync for keeping files out of sync with icloud.
+
+### Special Files working until ventura
+* On the root `/` directory of a internal or external Volume `.metadata-never-index` will turn of indexing for the whole drive. Use the terminal to `sudo touch \.metadata-never-index` for the root drive. Or use `\Volumes\NAMEOFVOLUME\.metadata-never-index` for another drive. 
+* On the root `/` directory of a (competing) boot drive with a version of OS X you can intelligently disable indexing by using `.metadata_never_index_unless_rootfs` to prevent the data from the drive to appear unless it is the boot drive. Use the terminal to `sudo touch \.metadata_never_index_unless_rootfs`. Or use `\Volumes\NAMEOFVOLUME\.metadata_never_index_unless_rootfs` for another drive.