I've blogged in the past about Wayne Martin and his outstanding list of command line tips. These are one line commands, some complex some simple, that you can use to accomplish a wide range of task. The overall number of tips is to 425 and Wayne recently reorganized them into 7 categories to make it easier for people to digest. There's very little scripting with any of these commands. Most use native or freely available command line tools. But because they are executed from a command line you could incorporate them into a script. I encourage you to check them out.
The single list:
http://waynes-world-it.blogspot.com/2008/09/useful-command-lines.html
The same commands split into categories:
http://waynes-world-it.blogspot.com/2008/09/useful-active-directory-command-line.html
http://waynes-world-it.blogspot.com/2008/09/useful-dns-dhcp-and-wins-command-line.html
http://waynes-world-it.blogspot.com/2008/09/useful-general-command-line-operations.html
http://waynes-world-it.blogspot.com/2008/09/useful-vmware-esx-and-vc-command-line.html
http://waynes-world-it.blogspot.com/2008/09/useful-windows-mscs-cluster-command.html
http://waynes-world-it.blogspot.com/2008/09/useful-windows-printer-command-line.html
http://waynes-world-it.blogspot.com/2008/09/useful-ntfs-and-security-command-line.html