Curated reference snippets, command recipes, and architecture notes gathered across software engineering and system administration.
Key commands for keeping commit history clean, recovering accidentally dropped commits, and safely updating feature branches without noisy merge commits.
# Safely update branch on top of main
git fetch origin
git rebase origin/main
# Interactive rebase for the last 4 commits (squash/fixup)
git rebase -i HEAD~4
# Safe push that refuses overwrite if remote has changed
git push --force-with-lease
# Recover lost commits or discarded stash
git reflog
Modern Rust and Go based CLI utilities that provide syntax highlighting, faster parallel disk crawling, and sensible defaults over legacy coreutils.
# Modern grep: ripgrep (rg) ignores .gitignore and hidden files by default
rg "pattern" src/ --type rust
# Modern find: fd
fd -e md -x wc -w
# Modern cat: bat (with syntax highlighting and git diff margins)
bat README.md
# Modern ls: eza
eza -lah --icons --git
Quick one-liners for keeping local Docker host storage trimmed and inspecting network namespaces in failing containers.
# Reclaim space from dangling build caches and untagged images
docker system prune -a --volumes -f
# Inspect container resource usage stream
docker stats --format "table {{.Name}}\t{{.CPUPerc}}\t{{.MemUsage}}\t{{.NetIO}}"
# Spawn temporary debug container inside an existing container's network
docker run --rm -it --net=container:<target_container> nicolaka/netshoot
Standard best practices for generating modern elliptic-curve keys, protecting keys with secure KDF rounds, and configuring safe client defaults.
# Generate high-security Ed25519 key with 100 KDF rounds
ssh-keygen -t ed25519 -a 100 -C "user@device-label"
# Recommended ~/.ssh/config snippet
Host *
AddKeysToAgent yes
IdentitiesOnly yes
StrictHostKeyChecking accept-new