Bunch o' cheat sheets - Stefaan Lippens inserts content here

You're probably very familiar with the tools you use daily and operate them from muscle memory. But there are also these setup or maintenance tasks you only do every X months and their practical details are a bit hazy.

This is a random, work-in-progress collection of cheat sheets for these commands or workflows I use too infrequently to remember.

Jupyter/JupyterLab

List installed Jupyter/JupyterLab kernels (run from env that has jupyter installed):
```
 jupyter kernelspec list
```
Add a new kernel for a custom virtual/conda env:
- Enter the virtual/env (e.g. . bin/venv/activate or conda activate $envname)
- Install ipykernel package: e.g. pip install ipykernel
- Create kernel spec for jupyter/jupyterlab:
```
python -m ipykernel install --user --name $kernelname
```
Optionally add --display-name "Pretty Name" to give it a prettier name in the Jupyter(Lab) UI - Check that kernel is now listed at jupyter kernelspec list (run this from env where you run Jupyter(Lab))

Conda/Anaconda

Updating
- update conda (base environment): conda update conda
- Update all packages in an environment: conda update --all
Remove unused packages and caches (can save up multiple GB).
```
 conda clean --all
```
(optionally add --dry-run)
Remove environment conda env remove -n $ENVNAME

Homebrew

List installed formulas
Including dependencies: brew list
Only the "leave" formulas: brew leaves

How do I update my local packages?

 # First update the formulae and Homebrew itself:
 brew update
 # You can now find out what is outdated with:
 brew outdated
 # Upgrade everything with:
 brew upgrade
 # Or upgrade a specific formula with:
 brew upgrade <formula>

By default, Homebrew does not uninstall old versions of a formula. To clean up the accumulation of old, unused versions:
```
 brew cleanup <formula>
 # or clean up everything at once (add `-n` for dry run):
 brew cleanup
```
Remove packages that were once installed as dependency of another, but not necessary anymore:
```
 brew autoremove
```
General checkup
```
 brew doctor
```

Docker

First, it's best to clean up all stopped containers (assuming these are all just disposable leftovers).
```
# Check first for stopped containers
docker ps -a
# Prune stopped containers
docker container prune
```

Clean up dangling images

# List images we currently have
docker image ls

# Prune dangling images (untagged and not being used by a container)
docker image prune

A bit more aggressive: prune all images (also tagged ones) that were created long enough ago
```
docker image prune -a --filter "until=2022-01-01"
```

Vim

(yes, I use vim too infrequently to remember these, sue me)

Change a word (e.g. interactive git rebase): :cw
show line numbers :set number