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  • Unix How-To: Time-Saving Aliases

    Posted July 21, 2010 - 7:00 am

    Unix users are always looking for ways to make their systems a little easier to use or themselves more productive. In today's column, we'll look at a series of helpful aliases that might preserve a few of those brain cells for harder tasks.

  • Unix tip: Recursively removing empty directories

    Posted April 29, 2009 - 1:53 pm

    Recursively removing empty directories from a file system might seem like a lot of work. How do you find all the directories and how do you determine programmatically which of them are empty? But let's look at how this task can be made very easy by taking advantage of the normal behavior of the rmdir command.

  • Grappling with disk space

    Posted September 24, 2008 - 2:30 pm

    Disks are getting bigger and bigger, but so are our users' data collections. How do you quickly pin down the source of the problem when a file system suddenly fills up? Let's look at some useful commands.

  • Unix Tip: Finding services on a subnet

    Posted May 14, 2007 - 11:23 am

    If you have ever needed to survey a large group of systems to find out which of them supported some particular service, such as ftp, telnet, ssh or some other particular application, you have probably thought of numerous ways to query the systems for the required information and display it in some usable fashion. Many methods of obtaining information from servers, however, require some sort of login or a remote shell request that either takes more time than you want to spend or requires you to configure some sort of trust on the part of the systems with the information for the system on which it is being collected. In today's column, we will look at a way to find out about services running on systems without setting up any access ahead of time.
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