Lecture Notes

CSE 391

Table of contents

Week 2

Most of the tools will be in Linux and *nix systmes.
Knowing that tools exist can help you navigate projects.
Unix - initially developed in 1970 at Bell Labs; many of these key ideas are still used today.
- Everything is a file
- Hierarchical file systems
- Multiple users
- Input / output streams
macOS is a disguised unix OS.
Linux vs Shell - shell is an interactive program which allows the user to interact with the operating system.
Why use shells over GUIs?
- Complicated tasks are easier on the command line
- Useful for remote servers
- Programmable
- Customizable
Bash shell will be used in this class, but there are many others.
One dot - current directory. Two dots - parent directory.
/query to search, press n to keep going.
-a will show hidden files - things starting with a dot.
touch will create a file.

uniq only removes duplicates when they’re next to each other - make sure to pipe through sort before uniq.
Command substitution
stdout | tee name.txt prints out and to a file.
cut - accept delimeter and field (one-indexed)

git status keeps you updated on the state of the repository.
If you’re not in a git repo, you’re going to get a fatal error.
git add and git stage do the same thing.
- git add . adds everything.
git diff - show differences.
- git diff --staged, shows differences between current repository and the local staging area
When you commit, you only commit to your local repository. git commit -m "...".
- Alternative: just typing git commit opens up the default text editor where you can type a more in-depth message.
- When completed, save and quit.
git status is focused on tracking files, git log is focused on tracking commits.
git diff --staged