apt-get

apt-getによる効率的なソフトウェアアップグレード管理
From VA Linux press release:

VA Linux customers who choose Debian 2.2 on the VA Linux 2200 series servers will be able to take advantage of automatic software updates via "apt-get" --  Debian's Internet-based software update management tool. "Apt-get," an integral Debian feature since March 1998, saves time by automatically identifying  required security updates, software dependencies and desirable enhancements. A system administrator can quickly and efficiently download and install the appropriate software packages with a few simple commands, for a single system or across an entire network.