* smaller questions
** files with binary data
*** posix has tended toward providing programmatic interfaces to binary files
    over time; in this assignment you'r providing that interface, but in
    "real life" you probably wouldn't
** approaches to finding information
*** working with the system manual
**** try "man man" :-)
**** try "man -k <searchterm>"
*** posix standards page
**** google "posix <function|concept>"
**** looking for the opengroup page for standards reference

** useful approach to being prepared for the exam
*** lectures tend to have a summary
** dev tools
*** all of the work for the course can be done in a terminal on the server
*** many of the projects can be done in any environment, some will only
    work in a Linux environment
*** vscode works well for many people
**** sometimes it exhibits strange build-time errors
**** some people find it easier to build in a terminal
** project plan
*** remember that this is primarily for you, we're a secondary audience

* approach to the program
** file format -- binary, fixed size records in time order
   conceptually, it's an array of utmp structs written to disk
** how many records in the file?
*** read through the file and count the records
*** get the file size and then divide
    lseek to SEEK_END gets you to the end, and returns offset from start