9  Git & GitHub

$ git init
Initialized empty Git repository in /Users/giulia/Projects/my-project/.git/

$ git status
On branch main

No commits yet

Untracked files:
  (use "git add ..." to include in what will be committed)
        analysis.py
        data/
        README.md

nothing added to commit but untracked files present

$ git add .
$ git commit -m "Add regression analysis"
[main (root-commit) a1b2c3d] Add regression analysis
 3 files changed, 127 insertions(+)
 create mode 100644 analysis.py
 create mode 100644 data/sample.csv
 create mode 100644 README.md

$ git log --oneline
a1b2c3d (HEAD -> main) Add regression analysis

$ git diff
diff --git a/analysis.py b/analysis.py
--- a/analysis.py
+++ b/analysis.py
@@ -10,6 +10,8 @@ def run_regression(data):
+    # Added robust standard errors
+    results = model.fit(cov_type='HC1')

$ git clone https://github.com/username/repo.git
Cloning into 'repo'...
remote: Enumerating objects: 156, done.
remote: Counting objects: 100% (156/156), done.
remote: Compressing objects: 100% (89/89), done.
remote: Total 156 (delta 67), reused 134 (delta 52)
Receiving objects: 100% (156/156), 45.23 KiB | 1.23 MiB/s, done.
Resolving deltas: 100% (67/67), done.

$ git remote add origin https://github.com/username/repo.git

$ git push origin main
Enumerating objects: 5, done.
Counting objects: 100% (5/5), done.
Delta compression using up to 8 threads
Compressing objects: 100% (3/3), done.
Writing objects: 100% (3/3), 456 bytes | 456.00 KiB/s, done.
Total 3 (delta 2), reused 0 (delta 0)
remote: Resolving deltas: 100% (2/2), completed with 2 local objects.
To https://github.com/username/repo.git
   a1b2c3d..e4f5g6h  main -> main

$ git pull origin main
remote: Enumerating objects: 8, done.
remote: Counting objects: 100% (8/8), done.
remote: Compressing objects: 100% (4/4), done.
Unpacking objects: 100% (4/4), done.
From https://github.com/username/repo
 * branch            main       -> FETCH_HEAD
Updating e4f5g6h..h7i8j9k
Fast-forward
 analysis.py | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

$ git checkout -b feature-new-analysis
Switched to a new branch 'feature-new-analysis'

$ git add . && git commit -m "Add new analysis"
[feature-new-analysis b2c3d4e] Add new analysis
 2 files changed, 45 insertions(+)
 create mode 100644 code/new_analysis.py
 create mode 100644 output/new_results.csv

$ git checkout main
Switched to branch 'main'
Your branch is up to date with 'origin/main'.

$ git merge feature-new-analysis
Updating a1b2c3d..b2c3d4e
Fast-forward
 code/new_analysis.py   | 35 +++++++++++++++++++++++++++++++++++
 output/new_results.csv | 10 ++++++++++
 2 files changed, 45 insertions(+)
 create mode 100644 code/new_analysis.py
 create mode 100644 output/new_results.csv

$ git branch -d feature-new-analysis
Deleted branch feature-new-analysis (was b2c3d4e).

$ git status
On branch main
Your branch is up to date with 'origin/main'.

Changes to be committed:
  (use "git restore --staged ..." to unstage)
        new file:   .gitignore

Untracked files not listed (use -u option to show untracked files)

# The following files are now being ignored:
#   data/raw/survey_2019.csv       (ignored by data/raw/*.csv)
#   data/raw/panel_data.dta        (ignored by data/raw/*.dta)
#   results.xlsx                    (ignored by *.xlsx)
#   output/figures/figure1.pdf     (ignored by output/figures/*)
#   output/tables/table1.tex       (ignored by output/tables/*)
#   .env                           (ignored by .env)
#   __pycache__/                   (ignored by __pycache__/)
#   .DS_Store                      (ignored by .DS_Store)

$ git check-ignore -v data/raw/survey.csv
.gitignore:4:data/raw/*.csv    data/raw/survey.csv