• ls -l Shows Question Marks instead of Permissions

    Occasionally, when running ls -l within a directory, you might find that the output shows question marks (?) instead of the usual permissions indicators:

    ben@Queeg:~$ ls -l ~/test
    ls: cannot access /var/www/html/Vx/Notes: Permission denied
    total 0
    d????????? ? ? ? ? ? Notes
  • sar Cheatsheet

    sar can be an incredibly helpful utility when examining system performance, but if not used regularly it's easy to forget which flags to use.

    This short post details a number of useful arguments to pass