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Free online tools to generate, calculate,
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Unix Utils

Unix and Linux command-line tools. Permission calculators, cron expression builders, shell script linting, and command explainers.

Awk Quick Builder
Generate awk one-liners for column selection, sum, average, count, group-by, and CSV/TSV processing. Live preview with sample data.
Bash Expansion
Try ${var#pattern}, ${var:-default}, ${var:offset:length}, ${var/find/replace} and more with instant live results.
Chmod Calculator
Convert between octal (755) and symbolic (rwxr-xr-x) Unix file permissions. Visual checkboxes, recursive commands, and umask preview.
Cron Expressions
Free online cron expression generator, parser, and schedule builder. Build with presets, a friendly schedule builder, or a visual field editor.
Curl Command Builder
Build complex curl commands with a friendly UI. Configure HTTP method, headers, JSON or form body, authentication, and options.
Find Command Builder
Interactive find and fd command generator. Build commands by name, type, size, modification time, and actions like exec or delete.
ls -l Decoder
Paste any ls -l output line and decode file type, permissions, owner, group, size, and timestamps into a readable breakdown.
Port Service Lookup
Search port numbers and service names. Look up 22 → SSH, 5432 → PostgreSQL, and more. IANA registered ports plus common unofficial services.
Sed One-Liner
Build common sed one-liners for search-and-replace, line deletion, field extraction, and more. Preview before and after results instantly.
Command Explainer
Paste any Unix/Linux command and instantly see a breakdown of each argument, flag, and option with clear descriptions.
Shell Paste Checker
Paste any Bash or Zsh snippet and instantly see warnings, suggestions, and best practices. All analysis runs locally in your browser.
Umask Calculator
Calculate effective file and directory permissions after applying umask. Visual bitwise breakdown, common presets, and shell commands.

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