Both cURL and wget are command-line download tools, but they have significant differences in design philosophy, features, and use cases. Understanding these differences helps choose the right tool for actual work.
Core Differences
| Feature | cURL | wget |
|---|---|---|
| Design Goal | Data transfer tool | File download tool |
| Protocol Support | 20+ protocols | Mainly HTTP/HTTPS/FTP |
| Bidirectional Transfer | ✅ Supports upload & download | ❌ Mainly download |
| API Testing | ✅ Very suitable | ❌ Not suitable |
| Recursive Download | ❌ Not supported | ✅ Supports site mirroring |
| Resume Download | ✅ Supported | ✅ Supported |
| Background Download | ❌ Needs nohup | ✅ Native support |
| Config File | ✅ .curlrc | ✅ .wgetrc |
| Cookie Support | ✅ Full support | ✅ Supported |
| Output Format | Flexible & controllable | Simple & intuitive |
Feature Comparison
1. Protocol Support
# cURL supports multiple protocols curl https://api.example.com # HTTPS curl ftp://ftp.example.com/file # FTP curl sftp://sftp.example.com/file # SFTP curl scp://host.example.com/file # SCP curl smtp://mail.example.com # SMTP curl ldap://ldap.example.com # LDAP # wget mainly supports HTTP/HTTPS/FTP wget https://example.com/file.zip # HTTPS wget ftp://ftp.example.com/file # FTP
2. Upload Capability
# cURL supports upload curl -T file.txt ftp://ftp.example.com/ curl -F "file=@upload.pdf" https://api.example.com/upload # wget doesn't support upload # Need other tools like ftp, scp
3. API Interaction
# cURL is perfect for API testing curl -X POST https://api.example.com/users \ -H "Content-Type: application/json" \ -H "Authorization: Bearer token" \ -d '{"name":"test"}' # wget is not suitable for API testing wget --post-data='name=test' https://api.example.com/users # Limited functionality, doesn't support complex headers
4. Recursive Download
# wget excels at recursive website download wget --mirror --convert-links --adjust-extension \ --page-requisites --no-parent \ https://example.com/ # cURL doesn't support recursive download # Need other tools or scripts
Use Case Comparison
Choose cURL When
# 1. API development and testing curl -v https://api.example.com/users curl -X POST -H "Content-Type: application/json" -d '{}' https://api.example.com/users # 2. Need to upload files curl -F "file=@upload.pdf" https://api.example.com/upload # 3. Complex HTTP operations curl -X PATCH -H "Authorization: Bearer token" https://api.example.com/users/1 # 4. Multi-protocol support needed curl sftp://user@host.com/file curl smtp://mail.example.com # 5. Need flexible output control curl -w "%{http_code}\n" -o /dev/null -s https://api.example.com
Choose wget When
# 1. Download entire website wget --mirror https://example.com/ # 2. Background download of large files wget -b https://example.com/large-file.zip # 3. Batch download wget -i urls.txt # 4. Polite download following robots.txt wget --recursive --level=1 https://example.com/ # 5. Simple file download wget https://example.com/file.zip
Command Comparison
| Task | cURL | wget |
|---|---|---|
| Simple download | curl -O https://example.com/file.zip | wget https://example.com/file.zip |
| Specify filename | curl -o myfile.zip https://example.com/file.zip | wget -O myfile.zip https://example.com/file.zip |
| Resume download | curl -C - -O https://example.com/file.zip | wget -c https://example.com/file.zip |
| Rate limit | curl --limit-rate 1M -O file.zip | wget --limit-rate=1m file.zip |
| Background | nohup curl -O file.zip & | wget -b file.zip |
| Follow redirects | curl -L https://example.com | wget https://example.com (default) |
| Recursive | ❌ Not supported | wget -r https://example.com |
| POST request | curl -X POST -d 'data' URL | wget --post-data='data' URL |
Performance Comparison
# Test download speed # cURL time curl -s -o /dev/null https://example.com/large-file.zip # wget time wget -q -O /dev/null https://example.com/large-file.zip # Conclusion: Both have similar download performance, differences are mainly in features
Project Selection Advice
Web Development/Backend Development
Recommend cURL because:
- API testing and debugging
- Need to send various HTTP methods
- Need to set complex request headers
- Need to handle JSON data
- Need to upload files
# Daily development examples # Test API curl -X POST https://localhost:3000/api/users \ -H "Content-Type: application/json" \ -d '{"name":"test"}' # View response headers curl -I https://api.example.com/health # Performance test curl -w "@curl-format.txt" -o /dev/null -s https://api.example.com
Operations/System Administration
Recommend wget because:
- Download packages and files
- Background download tasks
- Website backup and mirroring
- Batch download
# Operations scenarios # Download package wget https://dl.example.com/software-1.0.tar.gz # Background download wget -b https://example.com/backup.tar.gz # Website mirror wget --mirror --convert-links https://internal-docs.example.com/
Data Scraping/Crawling
Recommend wget because:
- Recursive download capability
- Follows robots.txt
- Automatic link conversion
# Data scraping example wget --recursive --no-clobber --page-requisites \ --html-extension --convert-links \ --restrict-file-names=windows \ --domains example.com \ --no-parent https://example.com/data/
Combined Usage
In actual work, both can be used together:
#!/bin/bash # Combined usage example # Use cURL to get download link DOWNLOAD_URL=$(curl -s https://api.example.com/releases/latest | jq -r '.download_url') # Use wget to download file (supports resume and background) wget -c -b "$DOWNLOAD_URL" -O latest-release.tar.gz # Use cURL to verify download result curl -I "file://$(pwd)/latest-release.tar.gz"
Summary
| Scenario | Recommended Tool | Reason |
|---|---|---|
| API development/testing | cURL | Comprehensive features, fine control |
| File download | wget | Simple to use, background support |
| Website mirroring | wget | Strong recursive download |
| Multi-protocol transfer | cURL | Supports 20+ protocols |
| Script automation | cURL | Flexible output control |
| Batch download | wget | Supports reading URLs from file |
Recommendation: Learn and master both, choose the most appropriate tool based on specific scenarios.