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fn fact [n]{
if (math $n == 0) {
return 1
} else {
return (math $n * (fact (math $n - 1)))
}
}
echo (fact 5)Coding works best on desktop or with an external keyboard.
Factorial Calculator - Elvish Typing CST Test
Factorial Calculator — Elvish Code
Calculates factorial of a number recursively.
fn fact [n]{
if (math $n == 0) {
return 1
} else {
return (math $n * (fact (math $n - 1)))
}
}
echo (fact 5)Elvish Language Guide
Elvish is a modern, expressive shell and scripting language designed for interactive use and automation. It emphasizes structured data, pipelines, modularity, and user-friendly syntax, combining features from traditional Unix shells with modern programming concepts.
Primary Use Cases
- ▸Interactive shell for Unix/Linux systems
- ▸Automation scripts for system tasks
- ▸Structured data pipelines and processing
- ▸Custom command extensions
- ▸Rapid prototyping of shell scripts
Notable Features
- ▸Structured data pipelines with lists, maps, and records
- ▸Modern, user-friendly syntax
- ▸Built-in support for functions, modules, and namespaces
- ▸Interactive editing and command completion
- ▸Error handling and rich debugging features
Origin & Creator
Created by Jeffrey Shu, first released in 2014.
Industrial Note
Elvish is particularly useful in environments where shell automation, interactive data processing, and structured scripting pipelines are needed.
Quick Explain
- ▸Elvish provides a powerful, object-oriented command pipeline system.
- ▸It supports structured data types like lists, maps, and records in pipelines.
- ▸Ideal for interactive shell use, scripting, and automation on Unix-like systems.
Core Features
- ▸Pipeline-based data processing
- ▸Variables, functions, and closures
- ▸Modules and package management
- ▸Structured data types (list, map, record)
- ▸Interactive REPL with autocomplete
Learning Path
- ▸Learn basic Elvish shell commands
- ▸Practice pipelines with structured data
- ▸Write functions and closures
- ▸Explore modules and namespaces
- ▸Develop scripts for automation tasks
Practical Examples
- ▸Automated system backups
- ▸Processing CSV or JSON files via pipelines
- ▸Interactive task runners
- ▸Custom shell command modules
- ▸Data parsing and reporting scripts
Comparisons
- ▸More modern than Bash/Zsh for structured data
- ▸Supports object-like pipelines
- ▸Smaller ecosystem than traditional shells
- ▸Easier to learn for modern scripting tasks
- ▸Better for modular and interactive workflows
Strengths
- ▸More expressive than traditional shells like Bash or Zsh
- ▸Supports structured data natively in pipelines
- ▸Interactive features for productivity
- ▸Extensible with custom modules
- ▸Modern scripting for system automation
Limitations
- ▸Smaller ecosystem compared to Bash/Zsh
- ▸Learning curve for users familiar with traditional shells
- ▸Limited adoption in enterprise environments
- ▸Not pre-installed on most systems
- ▸Some older shell scripts may need rewriting
When NOT to Use
- ▸Legacy shell scripts requiring Bash/Zsh
- ▸Environments where installation of new shell is restricted
- ▸Extremely high-performance batch processing
- ▸Systems with no support for Elvish packages
- ▸Projects requiring large enterprise library ecosystems
Cheat Sheet
- ▸var = value - variable assignment
- ▸fn myFunc { } - define function
- ▸list
- ▸use myModule - import module
- ▸echo $var - print value
FAQ
- ▸Is Elvish shell still maintained?
- ▸Yes, actively developed with community contributions.
- ▸Can I use Elvish instead of Bash?
- ▸Yes, for modern scripting and structured pipelines, but Bash may be better for legacy scripts.
- ▸Is Elvish cross-platform?
- ▸Primarily Unix/Linux, with experimental macOS support.
- ▸Why learn Elvish today?
- ▸For structured shell scripting, automation, and interactive pipelines.
30-Day Skill Plan
- ▸Week 1: Basic shell commands and variables
- ▸Week 2: Pipelines with lists and maps
- ▸Week 3: Functions, closures, and modules
- ▸Week 4: System automation and REPL testing
Final Summary
- ▸Elvish is a modern shell designed for structured, interactive scripting.
- ▸Supports structured data, pipelines, functions, and modular scripts.
- ▸Ideal for automation, interactive REPL, and modern Unix scripting workflows.
- ▸Provides a more expressive alternative to traditional shells like Bash or Zsh.
Project Structure
- ▸scripts/ - main Elvish scripts
- ▸modules/ - reusable modules
- ▸tests/ - validation scripts
- ▸docs/ - documentation and usage notes
- ▸configs/ - shell configuration files
Monetization
- ▸Automation scripts for businesses
- ▸Custom CLI tool development
- ▸Training for modern shell scripting
- ▸Consulting on structured shell workflows
- ▸Documentation and tutorials
Productivity Tips
- ▸Use REPL for iterative testing
- ▸Modularize scripts using modules
- ▸Leverage structured data in pipelines
- ▸Document pipelines and functions
- ▸Reuse modules across scripts
Basic Concepts
- ▸Variables and assignments
- ▸Lists, maps, and records
- ▸Functions and closures
- ▸Pipeline syntax and data flow
- ▸Modules and namespaces
Official Docs
- ▸Elvish official documentation
- ▸Elvish GitHub repository
- ▸Community tutorials and guides