Add advanced usage examples documentation

README.md

@@ -90,6 +90,7 @@ scrapingbee schedule --list
 
 ## More information
 
+- **[Advanced usage examples](docs/advanced-usage.md)** – Shell piping, command chaining, batch workflows, monitoring scripts, NDJSON streaming, screenshots, Google search patterns, LLM chunking, and more.
 - **[ScrapingBee API documentation](https://www.scrapingbee.com/documentation/)** – Parameters, response formats, credit costs, and best practices.
 - **Claude / AI agents:** This repo includes a [Claude Skill](https://github.com/ScrapingBee/scrapingbee-cli/tree/main/skills/scrapingbee-cli) and [Claude Plugin](.claude-plugin/) for agent use with file-based output and security rules.
 

docs/advanced-usage.md

@@ -0,0 +1,384 @@
+# Advanced Usage Examples
+
+Real-world workflows combining `scrapingbee` with standard shell tools. For basic usage and installation, see [README.md](../README.md).
+
+---
+
+## Piping and Text Processing
+
+### Extract titles and filter by keyword
+
+```bash
+scrapingbee scrape "https://news.ycombinator.com/" \
+  --extract-rules '{"titles":{"selector":".titleline > a","type":"list"}}' \
+  --extract-field titles \
+  | grep -i "python\|rust\|linux\|ai"
+```
+
+### Count links on a page
+
+```bash
+scrapingbee scrape "https://example.com" --preset extract-links \
+  --extract-field links | wc -l
+```
+
+### Extract domains from Google results
+
+```bash
+scrapingbee google "web scraping tools" \
+  --extract-field "organic_results.url" \
+  | awk -F/ '{print $3}' | sort -u
+```
+
+### Format extraction output as markdown list
+
+```bash
+scrapingbee scrape "https://news.ycombinator.com/" \
+  --extract-rules '{"titles":{"selector":".titleline > a","type":"list"}}' \
+  --extract-field titles \
+  | sed 's/^/- /'
+```
+
+---
+
+## Chaining Commands
+
+### Google search → scrape each result as markdown
+
+```bash
+scrapingbee google "scrapingbee tutorial" \
+  --extract-field "organic_results.url" \
+  | head -3 \
+  | scrapingbee scrape --input-file - \
+      --render-js false --return-page-markdown true \
+      --output-dir tutorial_pages/
+```
+
+### Google search → scrape → extract with AI
+
+```bash
+scrapingbee google "best restaurants paris" \
+  --extract-field "organic_results.url" \
+  | head -5 \
+  | scrapingbee scrape --input-file - \
+      --render-js false \
+      --ai-query "list of restaurant names and addresses" \
+      --output-format ndjson
+```
+
+---
+
+## Batch Processing
+
+### Scrape URLs from a file
+
+```bash
+scrapingbee scrape --input-file urls.txt \
+  --render-js false \
+  --return-page-text true \
+  --output-dir scraped_text/ \
+  --concurrency 10
+```
+
+### Process CSV input, augment in-place
+
+```bash
+# Input CSV has columns: url,company_name
+# --update-csv adds extracted data as new columns
+scrapingbee scrape --input-file companies.csv \
+  --input-column url \
+  --render-js false \
+  --extract-rules '{"title":"h1","description":"meta[name=description]@content"}' \
+  --update-csv
+```
+
+### Random sample from large URL list
+
+```bash
+scrapingbee scrape --input-file 10k_urls.txt \
+  --render-js false --sample 50 \
+  --output-format ndjson \
+  | python3 -c "
+import sys, json
+for line in sys.stdin:
+    d = json.loads(line)
+    print(f\"{d['status_code']} {d['latency_ms']}ms {d['input']}\")
+"
+```
+
+### Deduplicate and resume interrupted batches
+
+```bash
+cat urls_*.txt \
+  | scrapingbee scrape --input-file - \
+      --render-js false --deduplicate \
+      --output-dir deduped_results/ \
+      --resume
+```
+
+`--resume` skips items already saved in `--output-dir` from a previous run.
+
+---
+
+## NDJSON Streaming Pipelines
+
+### Stream results and process each line
+
+```bash
+scrapingbee scrape --input-file urls.txt \
+  --render-js false --output-format ndjson \
+  | while IFS= read -r line; do
+      url=$(echo "$line" | python3 -c "import sys,json; print(json.loads(sys.stdin.read())['input'])")
+      status=$(echo "$line" | python3 -c "import sys,json; print(json.loads(sys.stdin.read())['status_code'])")
+      echo "$status $url"
+    done
+```
+
+### Transform each result with --post-process
+
+```bash
+# Extract just the page title from each scraped page
+scrapingbee scrape --input-file urls.txt \
+  --render-js false --output-format ndjson \
+  --post-process 'python3 -c "
+import sys, re
+html = sys.stdin.read()
+m = re.search(r\"<title>(.*?)</title>\", html, re.IGNORECASE)
+print(m.group(1) if m else \"(no title)\")
+"'
+```
+
+---
+
+## Monitoring and Diffing
+
+### Detect content changes on a page
+
+```bash
+#!/bin/bash
+URL="https://news.ycombinator.com/"
+SNAP="/tmp/hn_snapshot.txt"
+RULES='{"titles":{"selector":".titleline > a","type":"list"}}'
+
+new=$(scrapingbee scrape "$URL" --extract-rules "$RULES" --extract-field titles 2>/dev/null)
+
+if [ -f "$SNAP" ]; then
+  diff <(cat "$SNAP") <(echo "$new") && echo "No changes" || echo "Page updated!"
+fi
+echo "$new" > "$SNAP"
+```
+
+### Monitor price changes
+
+```bash
+#!/bin/bash
+URL="https://example.com/product"
+PREV="/tmp/price_prev.txt"
+
+price=$(scrapingbee scrape "$URL" \
+  --ai-query "current price of the product" \
+  --render-js false 2>/dev/null)
+
+if [ -f "$PREV" ] && [ "$(cat "$PREV")" != "$price" ]; then
+  echo "Price changed: $(cat "$PREV") → $price"
+fi
+echo "$price" > "$PREV"
+```
+
+---
+
+## Screenshots
+
+### Screenshot to file via redirect
+
+```bash
+scrapingbee scrape "https://example.com" \
+  --screenshot true 2>/dev/null > page.png
+```
+
+### Full-page screenshot
+
+```bash
+scrapingbee scrape "https://example.com" \
+  --screenshot true --screenshot-full-page true \
+  --output-file fullpage.png
+```
+
+### Screenshot + HTML in one request
+
+```bash
+scrapingbee scrape "https://example.com" \
+  --preset screenshot-and-html \
+  --output-file result.json
+
+# Extract the screenshot:
+python3 -c "
+import json, base64
+with open('result.json') as f:
+    data = json.load(f)
+with open('screenshot.png', 'wb') as f:
+    f.write(base64.b64decode(data['screenshot']))
+print(f\"HTML length: {len(data['body'])} chars\")
+"
+```
+
+---
+
+## Scripting Patterns
+
+### Credit budget check before batch
+
+```bash
+#!/bin/bash
+set -e
+
+credits=$(scrapingbee usage 2>/dev/null \
+  | python3 -c "import sys,json; d=json.load(sys.stdin); print(d['max_api_credit']-d['used_api_credit'])")
+url_count=$(wc -l < urls.txt)
+cost=$((url_count * 1))  # 1 credit each with render_js=false
+
+echo "Need ~$cost credits, have $credits"
+if [ "$cost" -gt "$credits" ]; then
+  echo "Not enough credits!" >&2
+  exit 1
+fi
+
+scrapingbee scrape --input-file urls.txt --render-js false --output-dir results/
+```
+
+### Custom retry logic
+
+```bash
+#!/bin/bash
+URL="https://example.com"
+MAX_RETRIES=3
+
+for i in $(seq 1 $MAX_RETRIES); do
+  if result=$(scrapingbee scrape "$URL" --render-js false 2>/dev/null); then
+    echo "$result"
+    exit 0
+  fi
+  echo "Attempt $i failed, retrying..." >&2
+  sleep $((i * 2))
+done
+echo "All $MAX_RETRIES attempts failed" >&2
+exit 1
+```
+
+> **Note:** The CLI has built-in `--retries` and `--backoff` flags, so manual retry is only needed for custom logic.
+
+---
+
+## Google Search Workflows
+
+### Compare search results across countries
+
+```bash
+for cc in us gb de fr; do
+  echo "=== $cc ==="
+  scrapingbee google "best vpn" --country-code $cc \
+    --extract-field "organic_results.title" 2>/dev/null | head -3
+done
+```
+
+### Search and summarize with AI
+
+```bash
+scrapingbee google "climate change" --search-type news \
+  --extract-field "organic_results.url" 2>/dev/null \
+  | head -3 \
+  | scrapingbee scrape --input-file - --render-js false \
+      --ai-query "one-sentence summary of the article" \
+      --output-format ndjson 2>/dev/null \
+  | python3 -c "
+import sys, json
+for line in sys.stdin:
+    d = json.loads(line)
+    print(f\"[{d['input'][:60]}]\")
+    print(f\"  {d['body']}\")
+    print()
+"
+```
+
+### Google AI mode
+
+```bash
+scrapingbee google "how does CRISPR work" --search-type ai-mode \
+  --extract-field "ai_mode_answer.response_text"
+```
+
+---
+
+## Export and Format Conversion
+
+### Merge batch output to single NDJSON file
+
+```bash
+scrapingbee export --input-dir batch_results/ --format ndjson --output-file all.ndjson
+```
+
+### Flatten nested JSON to CSV
+
+```bash
+scrapingbee export --input-dir batch_results/ --format csv --flatten --output-file flat.csv
+```
+
+### Select specific CSV columns
+
+```bash
+scrapingbee export --input-dir batch_results/ --format csv --flatten \
+  --columns "_url,title,description" --output-file selected.csv
+```
+
+---
+
+## LLM / RAG Chunking
+
+### Split page into chunks for embeddings
+
+```bash
+scrapingbee scrape "https://en.wikipedia.org/wiki/Web_scraping" \
+  --return-page-markdown true \
+  --chunk-size 1000 --chunk-overlap 100 \
+  | python3 -c "
+import sys, json
+for line in sys.stdin:
+    chunk = json.loads(line)
+    print(f\"Chunk {chunk['chunk_index']}/{chunk['total_chunks']}: {len(chunk['content'])} chars\")
+"
+```
+
+---
+
+## Presets
+
+```bash
+# Fastest possible scrape (no JS rendering, 1 credit)
+scrapingbee scrape URL --preset fetch
+
+# Get all links on a page
+scrapingbee scrape URL --preset extract-links --extract-field links
+
+# Get all emails on a page
+scrapingbee scrape URL --preset extract-emails --extract-field emails
+
+# Screenshot only
+scrapingbee scrape URL --preset screenshot --output-file page.png
+
+# Screenshot + HTML in one request
+scrapingbee scrape URL --preset screenshot-and-html --output-file both.json
+```
+
+---
+
+## Tips
+
+- **Use `--render-js false`** whenever possible — 1 credit vs 5, and faster. `--preset fetch` is a shorthand.
+- **Use `--verbose`** to see credit costs — output goes to stderr so it won't break pipes.
+- **Use `--extract-field`** for pipe-friendly output (one value per line) instead of parsing JSON manually.
+- **Use `--output-format ndjson`** for streaming batch results to stdout.
+- **Use `--deduplicate`** to avoid wasting credits on duplicate URLs in batch input.
+- **Use `--sample N`** to test your pipeline on a small subset before running a full batch.
+- **Use `--resume`** to restart interrupted batches without re-fetching completed items.
+- **Use `--post-process`** to transform each batch result with a shell command.
+- **Use `SCRAPINGBEE_API_KEY` env var** in scripts and CI instead of `scrapingbee auth`.