What Is Kerberos, and How Does It Work? Kerberos is basically a “trusted third party” that two different entities can use to validate the identity of the other with. Kerberos KDCs A kerberos Key Distribution Center (KDC) is the kerberos server that has a copy of a secret cryptographic key that [...]
Working with Kerberos on MCECS Linux Systems Kerberos management commands quickref kinit - initialize a new Kerberos ticket krenew - renew an unexpired Kerberos ticket (works until renewal lifetime exceeded - 7 days) klist - show current Kerberos tickets and expiry times If you let your kerberos ticket expire past the [...]
Persistent Shell Sessions with Screen Screen is a program that facilitates the management of multiple shell sessions. When you run screen from a Linux command line, it will open a screen session on top of your current command line window, with a few important benefits: Screen windows behave similarly to multiple tabs on a [...]
Linux Versions Ubuntu Linux systems are running Xenial (1604). This includes: CS penguin (FAB 88-10) and particle (FAB 88-09) labs ada.cs.pdx.edu (aka linux.cs.pdx.edu) and babbage.cs.pdx.edu Linux Systems in the FAB MCECS General Lab (FAB 55-17) ruby.cat.pdx.edu and rita.cat.pdx.edu RHEL 5 still runs on: eve.ece.pdx.edu walle.ece.pdx.edu archive.cecs.pdx.edu RHEL 7 runs on mo.ece.pdx.edu Software: Faculty teaching classes [...]
Connecting to your Stash This is a guide to connecting to an MCECS stash using Ubuntu Linux. These instructions can be easily adapted to other Linux distributions. Connecting from on campus (lab machines and tier 1 machines) Using the command line Stashes can be accessed through the command line [...]
Burning ISOs to CD/DVD in Ubuntu Step 1 Once you have an ISO selected to burn, right-click on the icon and then left-click on the option "Write to Disc...". You want to make sure that you have a Recordable or Re-Writeable disc in your DVD drive. Remember that some ISOs are [...]
Basic Shell Commands For detailed information on UNIX commands type "man command" where "command" is the command name you are looking for more info on. Command Description apropos Searches the man pages for a keyword you specify. The name of the man page is in the first column. systemname.domain.pdx.edu> apropos floppy eject [...]
Reference Sheets UNIX Commands Reference - Still valid for Linux Linux Editors Reference
Understanding Files & Directories in Linux This is an oldie but goodie. Although it references UNIX, the basic concepts of working in the Shell on Linux is little changed. In UNIX, almost everything can be thought of as a file, even physical devices and processes. As long as information can be read [...]
Linux Directories The UNIX directory is laid out as a giant hierarchy of files, like a tree. In UNIX, everything is a sort of file to be manipulated, even what many users would consider "folders". In UNIX, a folder is a "directory". The UNIX tree starts at "root", or "/", then spreads out [...]