Mac os x El Capitan
I want to hide the spotlight icon.
Enter the command:
sudo chmod 600 /System/Library/CoreServices/Search.bundle/Contents/MacOS/Search
In response to receiving this:
chmod: Unable to change file mode on /System/Library/CoreServices/Search.bundle/Contents/MacOS/Search: Operation not permitted
How to fix it?
Not sure about the other answers, because /System/Library/CoreServices/Search.bundle
doesn't seem to exist here.
However, if you're using Bartender, you can still remove the Spotlight icon (while keeping Spotlight search in tact) by temporarily disabling System Integrity Protection.
csrutil disable
csrutil enable
After you've re-enabled SIP, Bartender will keep hiding the icon.