Gemini CLI¶

npm install -g @google/gemini-cli

curl -fsSL https://gemini.google.dev/install.sh | bash

gemini --version

gemini auth login

export GEMINI_API_KEY="your-api-key-here"
# Add to ~/.bashrc or ~/.zshrc for persistence

gemini auth status

# Basic text generation
gemini "Explain how HTTP works"

# Code generation
gemini "Write a Python function to sort a list"

# File analysis
gemini "Analyze this code" --file src/main.py

# Use specific model
gemini "Hello world" --model gemini-pro

# Available models
gemini models list

# JSON output
gemini "What is Python?" --format json

# Markdown output
gemini "Create a README" --format markdown

# Process multiple files
gemini "Review these files for bugs" --file *.py

# Batch prompts from file
gemini --prompts-file batch_requests.txt

# Maintain conversation context
gemini chat start
gemini chat send "What is React?"
gemini chat send "Show me a component example"
gemini chat end

# Analyze images
gemini "Describe this image" --image screenshot.png

# Process documents
gemini "Summarize this document" --file report.pdf

# Generate from templates
gemini generate --template api-docs --input openapi.yaml

# Pre-commit code review
#!/bin/bash
# .git/hooks/pre-commit
gemini "Review this commit for issues" --git-diff

# Generate test cases
gemini "Generate pytest tests for" --file src/utils.py \
  --output tests/test_utils.py

# Create documentation
gemini "Generate API docs from" --file api/routes.py \
  --format markdown > docs/api.md

export GEMINI_MODEL="gemini-pro"
export GEMINI_MAX_TOKENS="2048"
export GEMINI_TEMPERATURE="0.3"
export GEMINI_OUTPUT_FORMAT="markdown"

# Security analysis
gemini "Check for security vulnerabilities" --file app.py

# Performance review
gemini "Suggest performance improvements" --file slow_function.py

# Code style review
gemini "Review code style and suggest improvements" --file *.js

# README generation
gemini "Create README from code structure" --directory src/

# API documentation
gemini "Generate API docs" --file server.py --format markdown

# Changelog creation
gemini "Generate changelog from git log" --git-log --since "1 week ago"

# Generate boilerplate
gemini "Create Express.js server with auth" --template express-auth

# Database queries
gemini "Write SQL query to find top customers" --schema schema.sql

# Error debugging
gemini "Explain this error and suggest fix" --error "$(cat error.log)"

# Best for complex reasoning
gemini "Design system architecture" --model gemini-pro

# For image analysis
gemini "Analyze UI mockup" --image design.png --model gemini-pro-vision

# For quick responses
gemini "Quick code snippet" --model gemini-flash

# Be specific about requirements
gemini "Write Python function that takes list of integers, 
        returns sorted list in descending order, 
        handles empty lists and None input"

# Provide context
gemini "Fix this React component bug" --file Component.jsx \
       --context "Error: Cannot read property 'map' of undefined"

# Use appropriate model for task
gemini "Simple calculation" --model gemini-flash     # Fast
gemini "Complex analysis" --model gemini-pro        # Thorough

# Batch similar requests
gemini "Review these files" --file *.py --batch-size 5

# Save responses
gemini "Generate tests" --file app.py > generated_tests.py

# Pipe to other tools
gemini "Extract function names" --file *.js | grep "function"

# PR review automation
gh pr diff | gemini "Review this PR for issues"

# ESLint integration
eslint --format json src/ | gemini "Explain these linting errors"

# Test result analysis
pytest --tb=short | gemini "Analyze test failures"

# Authentication problems
gemini auth logout
gemini auth login

# Rate limit errors
gemini --rate-limit 1 "Your prompt here"

# Large file handling
gemini "Analyze code" --file large_file.py --chunk-size 1000

# Enable verbose logging
gemini --debug "Test prompt"

# Check API status
gemini status check