Exercise 1: Make a README-file

1. Done with:

cd in5800-intro

2. The file README.md should contain:

# Readme

This repo is used for the intro exercises in IN5800.

3. Done with the follwoing three commands:

git add README.md
git commit -m "Add README-file."
git push origin master

Exercise 2: Download and manage files

1. Done with the two commands:

mkdir downloads
mkdir data

2. Done with the following command (note -O downloads/data.zip stores the downloaded file at downloads/data.zip):

wget -O downloads/data.zip https://leifhka.org/in5800/lectures/intro/data.zip

3. Done by using unzip as follows (note -d data/ extracts the files into the data-folder):

unzip -d data/ downloads/data.zip

4. Done with the more complicated command:

cat data/data.csv | grep -e "^IN5800"

5. Done by using rm with the -r flag to also remove contained files:

rm -r downloads
rm -r data

Exercise 3: Make Makefile

1. The Makefile should look like this:

folders:
    mkdir downloads
    mkdir data

downloads/data.zip: folders
    wget -O downloads/data.zip https://leifhka.org/in5800/lectures/intro/data.zip

data/data.csv: downloads/data.zip
    unzip -d data/ downloads/data.zip

in5800_data: data/data.csv
    cat data/data.csv | grep -e "^IN5800"

clean:
    rm -r downloads
    rm -r data

2. make in5800_info
3. make clean
4. The README.md-file should now look like this:

# Readme

This repo is used for the intro exercises in IN5800.

# Use

Below is a list of useful **commands**:

- `in5800_info`
- `clean`

5. Done with:

git add README.md Makefile
git commit -m "Add a Makefile to automate the information extraction."
git push origin master

Exercise 4: Branching and Make-variables

1. Branches are made with the git checkout command with the -b-flag as follows (which automatically switches you to it):

git checkout -b feature/URLs-in-vars

2. The Makefile should now look like this (note the need for $ and parenthesis when variables are used in Makefiles):

data_url = https://leifhka.org/in5800/lectures/intro/data.zip

folders:
    mkdir downloads
    mkdir data

downloads/data.zip: folders
    wget -O downloads/data.zip $(data_url)

data/data.csv: downloads/data.zip
    unzip -d data/ downloads/data.zip

in5800_data: data/data.csv
    cat data/data.csv | grep -e "^IN5800"

clean:
    rm -r downloads
    rm -r data

3. Simply make in5800_data and make clean as before
4. Again:

git add Makefile
git commit -m "Move URL into variable."
git push origin feature/URLs-in-vars

5. Done with (note that merge only merges the branches locally, so a push is necessary to update the remote repo):

git checkout master
git merge feature/URLs-in-vars
git push origin master