I have a mass of directories in /tmp which contain a single file called SingletonCookie. They are related to www/chromium, which I use extensvely.
According to
SingletonCookie: broken symbolic link to 2138267798210928353
Periodic daily won't get rid of them. How should I handle them?
According to
file -s SingletonCookieSingletonCookie: broken symbolic link to 2138267798210928353
Periodic daily won't get rid of them. How should I handle them?