Utility Pro

Overview

Masters the command-line environment by turning raw text and unstructured data into actionable insights. Combines Rust-powered search tools (ripgrep, fd, bat), structured data shells (Nushell), JSON manipulation (jq/yq), and modern HTTP clients (xh) for high-performance CLI workflows.

Core philosophy: Replace legacy text-parsing pipelines (grep/awk/sed chains) with purpose-built tools that understand structure. ripgrep understands gitignore rules, fd understands file types, jq understands JSON, and Nushell understands tables.

When to use: Codebase-wide search and analysis, multi-file refactoring, JSON/YAML transformation pipelines, API debugging, directory navigation, log parsing, disk usage auditing, dependency tracing.

When NOT to use: GUI-based tasks, complex application logic (write a script instead), tasks requiring interactive prompts.

Quick Reference

Pattern	Tool / Command	Key Points
Text search	rg "pattern" -g "*.tsx"	10-100x faster than grep, respects .gitignore
File search	fd -e pdf or fd "pattern"	Fast alternative to find with smart defaults
Syntax-highlighted read	bat file.ts	Cat with syntax highlighting and git integration
Directory jump	z project-name	Remembers frequently visited directories
Fuzzy search	fzf or CTRL-T / CTRL-R	Interactive selection for files and history
Tree view	eza --tree --level=2	Metadata-rich ls replacement with tree support
JSON query	jq '.items[] | select(.active)'	Full functional programming for JSON
YAML query	yq '.config.database' file.yml	jq-like syntax for YAML files
HTTP request	xh POST api.example.com/v1/data key=value	Colorized, user-friendly HTTP client
Multi-file refactor	fd -e tsx -x sed -i 's/Old/New/g' {}	Find files then execute transforms
Structured shell	ls | where size > 1mb | sort-by size	Nushell tables instead of text parsing
Log parsing	rg "ERROR" --json | jq 'select(.type == "match") | .data.lines.text'	Combine ripgrep JSON output with jq filters
File preview with search	fzf --preview 'bat --color=always {}'	Browse files with syntax-highlighted preview
Find recently changed	fd --changed-within 1h	Find files modified within a time window
Export count by file	rg -c "pattern" -g "*.ts" | sort -t: -k2 -rn	Count matches per file, sorted by frequency
JSON format conversion	yq -o json config.yml	Convert between YAML, JSON, CSV, and other formats
Advanced regex search	rg -P "(?<=function\s)\w+" --only-matching	PCRE2 for lookahead/lookbehind patterns
Git-aware file listing	eza -la --git --icons	Show file metadata with inline git status

Tool Overview

Category	Modern Tool	Replaces	Key Advantage
Text search	ripgrep (rg)	grep, ag, git grep	Speed, .gitignore awareness, Unicode
File search	fd	find	Smart defaults, regex, parallelism
File viewer	bat	cat, less	Syntax highlighting, git diff markers
Directory jump	zoxide (z)	cd, autojump	Frecency-based ranking, fzf fallback
Fuzzy finder	fzf	manual piping	Universal selector for any list
File listing	eza	ls, tree	Tree view, git status, icons
JSON processing	jq	awk, python oneliners	Typed, functional JSON transforms
YAML processing	yq	sed on YAML	jq-compatible syntax for YAML
HTTP client	xh	curl, httpie	HTTPie syntax, Rust speed, single binary
Structured shell	Nushell	bash + awk/sed	Typed tables, native format conversion

Common Mistakes

Mistake	Correct Pattern
Using grep instead of ripgrep for codebase search	Use rg which is 10-100x faster and respects .gitignore by default
Piping ls output into grep for file filtering	Use fd for file discovery, or eza -D / eza --ignore-glob for listing
Writing complex awk scripts for structured data	Use Nushell or jq which natively understand JSON, CSV, and YAML
Running rm -rf in scripts without a dry-run step	Always add a verification or dry-run step before destructive operations
Using capturing groups in regex when not needed	Prefer non-capturing groups (?:...) for better performance in large-scale scans
Searching node_modules or .git directories	Use rg which skips these by default, or configure exclusions explicitly
Forgetting select(.type == "match") on rg --json	ripgrep JSON emits begin, match, context, end, and summary message types
Using curl with verbose flag syntax	Use xh which provides colorized output and HTTPie-compatible request-item syntax
Parsing text output between tools with cut/tr	Use Nushell pipelines that preserve structured data through every stage
Anchoring regex with .* at the start	Anchor with ^ when possible; unanchored .* causes expensive backtracking

Installation

All tools are available via common package managers. Most are single statically linked binaries.

Tool	macOS (Homebrew)	Linux (apt/cargo)
ripgrep	brew install ripgrep	apt install ripgrep or cargo install ripgrep
fd	brew install fd	apt install fd-find or cargo install fd-find
bat	brew install bat	apt install bat or cargo install bat
zoxide	brew install zoxide	cargo install zoxide
fzf	brew install fzf	apt install fzf
eza	brew install eza	cargo install eza
jq	brew install jq	apt install jq
yq	brew install yq	snap install yq or go install
xh	brew install xh	cargo install xh
Nushell	brew install nushell	cargo install nu

Shell integration (add to shell config after installing):

Tool	Shell Integration Required
zoxide	eval "$(zoxide init zsh)" (or bash/fish equivalent)
fzf	Source keybinding and completion scripts from fzf install

Delegation

• Large-scale codebase search and analysis: Use Explore agent to run ripgrep queries, trace dependencies, and map code patterns
• Multi-file refactoring workflows: Use Task agent to coordinate fd, sed, and verification steps across an entire project
• Pipeline architecture for data transformation: Use Plan agent to design structured pipelines combining jq, Nushell, and API tools

References

• Modern Unix Toolbox -- ripgrep, fd, bat, zoxide, fzf, eza, terminal setup
• Advanced Regex and jq -- named captures, lookahead/lookbehind, jq filters, integrated pipelines
• Nushell Structured Data -- table paradigm, API interaction, scripting, Unix interop