# DevOps & Cloud

> Tools for working with Cron, Docker, Nginx, and system permissions (Chmod).

- **Source:** DevDreaming (https://devdreaming.com)
- **Canonical URL:** https://devdreaming.com/tools/category/devops-cloud

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Tools for working with Cron, Docker, Nginx, and system permissions (Chmod).

All tools run client-side in your browser -- no signup, no upload.

## Tools in this category

- [Cron Expression Editor](https://devdreaming.com/tools/cron-expression-generator) -- A visual UI to build and validate Cron job schedules (e.g., `* * * * *`).
- [Chmod Calculator](https://devdreaming.com/tools/chmod-permission-calculator) -- Visually calculate UNIX file permissions (e.g., 755, 644) from checkboxes and output the numeric/symbolic code.
- [HTAccess Redirect Generator](https://devdreaming.com/tools/htaccess-redirect-generator) -- Create correct 301 and 302 redirect rules for Apache's `.htaccess` file.
- [Gitignore Generator](https://devdreaming.com/tools/gitignore-generator) -- Generate optimized `.gitignore` files for various languages and frameworks (Node, Python, Next.js).
- [CIDR Calculator](https://devdreaming.com/tools/cidr-range-calculator) -- Calculate IP address ranges and subnets from a CIDR block.
- [User Agent Parser](https://devdreaming.com/tools/user-agent-parser) -- Extract browser, OS, and device information from a raw User-Agent string.
- [HTTP Status Reference](https://devdreaming.com/tools/http-status-reference) -- Quick reference guide for HTTP status codes with descriptions and categories.
- [MIME Type Finder](https://devdreaming.com/tools/mime-type-finder) -- Look up MIME types for common file extensions with searchable reference.
- [Port Number Reference](https://devdreaming.com/tools/port-number-reference) -- Reference guide for common network ports with service names and protocols.
- [File Size Calculator](https://devdreaming.com/tools/file-size-calculator) -- Convert file sizes between bytes, KB, MB, GB, and TB.
- [ENV File Generator](https://devdreaming.com/tools/env-file-generator) -- Create .env files with environment variables and comments.
- [HTTP Header Parser](https://devdreaming.com/tools/http-header-parser) -- Parse and analyze HTTP request/response headers with category labels.

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