https://adventofcode.com/2021/day/1
I first attempted it with Scala. It worked, but I was not happy with the result. So I opted for bash.
Running the script will require bash of course. This is usually embedded in linux and the default terminal. Under windows the git bash can be used. I am unsure about Mac, however, I believe it uses bash by default as well.
To run this example locate your working directory to this directory.
Then run
./solution1.bash < input.txt
or alternatively
cat input.txt | ./solution1.bash
You can run the test with
./test.bash
The second part can be executed as similarly with
./solution2.bash < input.txt
cat input.txt | ./solution2.bash
If permissions are denied try to give permissions:
sudo chmod +x ./solution1.bash ./solution2.bash ./test.bash
sudo chmod +r ./input.txt
I was comfortable with the basic of bash, however, I do not write bash script regularly so I forget a lot as well. I used the following sources to complete this task:
https://ryanstutorials.net/bash-scripting-tutorial/bash-if-statements.php
https://www.hostinger.com/tutorials/bash-for-loop-guide-and-examples/
https://ryanstutorials.net/bash-scripting-tutorial/bash-arithmetic.php
https://stackoverflow.com/questions/806906/how-do-i-test-if-a-variable-is-a-number-in-bash
https://www.javatpoint.com/bash-read-file
https://kaijento.github.io/2017/03/19/bash-read-file-into-array/
https://www.cyberciti.biz/faq/finding-bash-shell-array-length-elements/