In the reading, we learned a variety of useful commands:
- pwd, cd
- cp, mv
- rm, rmdir
- cat, more/less
as well as concepts like:
- tab file name completion
- output redirection with
- quitting with Control-c
If any of these look unfamiliar to you, jump back to the reading for a refresher.
You can also run
man pwd to look at the ‘man’ual page for the
pwd command or any other.
man command is a great built-in feature but can sometimes be an intimidating information dump.
If you’d like a gentler start, you can check out tldr, which offers a simpler description with examples. Since you have Anaconda, you can install tldr by running:
pip install tldr
Once you’ve got the hang of things and are a power user of these commands, you can switch back to
man to see all the available options you can take advantage of.
We also learned that working in the command line is powerful, but comes with no “undo” functionality. If you’d like to give yourself a bit of a safety net when running commands like
rm, read on to sections 2.11-2.12 to see how to make those commands ask for confirmation first.
Reading Journal Review
As we discussed last time, state and stack diagrams are extremely useful for reasoning about code, especially with mutable objects like lists. We can use Python Tutor to visualize the difference between middle and chop.
Quick check: Compare and contrast lists and strings
One thing they have in common are that both are “iterables” - we can iterate over all the characters of a string or over all the elements of a list.
Read about iteration design patterns. Don’t forget to practice active reading with hands on keyboards trying things out! (This reading is a Jupyter notebook, and the download link for the source code is down at the bottom).
Which iteration patterns does the grocery store receipt program you wrote last time use? Rewrite it to use another coding style that you learned about in the reading.