Office Hours

Based on feedback I will move my Monday office hours to some time on Thursday. I will make another announcement when I finalize a time.

Quiz Feedback

1. Why is 400 the minimum permissions needed by jump.txt?
2. difference between ps x and ps aux
3. why won’t kill 1337 work?

We’ll do some experiments to check all of these.

File Permissions

1. inspect the permissions of a compiled binary (e.g. motr)
2. inspect hte permissions of a regular text file (e.g. motr.c)
3. manipulate permissions of files used for input/output redirection

TODO

We didn’t make it through these list items in the ‘File Permissions’ section that I had on my notes. We will probably get through some of them next class.

1. try to run motr.c as a command
2. write a simple build script
3. try to run it
4. set permissions
5. run it

Processes and Signals

Source can be found in /usr/share/src/week5/

1. What does the process ‘see’? (we didn’t do this)
   • inspect argv with redirection
2. infinite_hello example
   • Try ^C
   • Try kill

Setup SSH Keys (we didn’t make it this far)

$ ssh-keygen

Inspect the permissions for the ~/.ssh/ directory and its files.