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Shell and Github: Demo notes

UW Geospatial Data Analysis
CEE498/CEWA599
David Shean

Preparation and discussion

  • Make sure all students are on Jupyterhub whitelist (UW netid)
  • Distribute link to course Jupyterhub, have students start server
  • Discuss remote computing - underlying infrastructure, computer somewhere in Google data center in CA or OR
  • Close tab in Jupyterlab - demonstrate persistence
  • Ask about OS? Anybody using Linux? All of you!
  • Distribute assignment link through Github classroom

Basic git/Github workflow

  1. Clone assignment locally:
    git clone https://github.com/UW-GDA/01-shell-github-dshean.git
    • Alternatively, create a new repo called gda_test on Github:
    git clone https://github.com/dshean/gda_test.git  
cd gda_test  
ls -l
  2. Pick a text editor
    • Discuss text editors, pick one for command line, or use Jupyterlab text editor
  3. Edit README.md and add your name
  4. Commit the change
git status
git add README.md
git status
git commit -m "Added my name to README.md"
git status

Discussion of local vs origin

  • Open web browser to view origin repo on Github
  • git push
  • Refresh page, verify README.md was updated

Edit README.md on Github, commit directly

Pull changes to local repo

  • git pull
  • git log

Add a new script to the repo

Create a new text file

  • Discuss extensions (.sh vs. .txt or .py)
  • vim myawesomescript.py
  • Add some lines: 
    #! /usr/bin/env python
print("Pancakes rule!")

Commit the change

git status
git add myawesomescript.py
git status
git commit -m "Added myawesomescript.py"

Try to execute script, doesn't work

./myawesomescript.py

Check permissions

ls -l ./myawesomescript.py

Change permissions

chmod +x myawesomescript.py
ls -l myawesomescript.py
./myawesomescript.py

Commit permission change

git status
git diff myawesomescript.py
git add myawesomescript.py
git status
git commit -m "Change permissions on myawesomescript.py"

Review log, master is ahead of origin

git log
git log --graph --pretty=format:'%Cred%h%Creset -%C(yellow)%d%Creset %s %Cgreen(%cr) %C(bold blue)<%an>%Creset' --abbrev-commit

Push to origin

git push
git status

Review log, both origin and master are same

git log --graph --pretty=format:'%Cred%h%Creset -%C(yellow)%d%Creset %s %Cgreen(%cr) %C(bold blue)<%an>%Creset' --abbrev-commit

Other topics to discuss

  • Tab completion
  • Shell history (use up arrow)
  • Discuss filesystem
    • Output from which ls
    • Go to /
    • Explore /bin
  • Discuss executables
  • $PATH
  • bits, bytes
  • for loop 
    for i in solutions.txt words README.md
do
    ls $i
done
#One line:
for i in solutions.txt words README.md; do ls $i; done

Introduce assignment

  • more words
  • file words
  • How are we going to count the number of words? Online search term discussion
    • wc -l words
  • How to submit answers: create a new text file, copy your command and output to a new text file
  • more GLAH14_tllz_conus_lulcfilt_demfilt.csv