KornShell VS brush

• Compatibility
  KornShell (ksh) maintains backward compatibility with Bourne Shell (sh), making it easy for users familiar with sh to transition without altering their existing scripts substantially.
• Advanced Scripting Features
  ksh offers advanced scripting capabilities such as associative arrays, floating-point arithmetic, and built-in regular expressions, providing more powerful and flexible scripting tools.
• Job Control
  It provides robust job control, allowing users to manage and switch between multiple background tasks and processes easily.
• Interactive Use
  ksh supports features like command aliasing, history manipulation, and inline editing, enhancing its utility in interactive command-line environments.
• Performance
  ksh scripts often execute faster than those written in other shells like csh, due to more efficient resource management and execution mechanisms.

Possible disadvantages

• Complexity
  ksh is more complex compared to simpler shells like sh, making it potentially overwhelming for beginners or those seeking simplicity.
• Portability
  Not all systems come with ksh pre-installed, and differences between ksh88 and ksh93 can lead to portability issues across different Unix-like systems.
• Learning Curve
  Due to its rich feature set, ksh has a steeper learning curve, which could be a barrier for new users unfamiliar with shell scripting.
• Limited Adoption
  Despite its capabilities, ksh is not as widely adopted as other shells like bash or zsh, meaning less community support and fewer resources available.
• Licensing
  ksh is under the Common Public License, which may pose constraints for users or organizations compared to more permissively licensed shells.

• Modern Unix Shell
  Brush is a modern, Rust-based implementation of a Unix shell that aims to be compatible with bash, offering a fresh take on the traditional shell experience with improved performance and safety guarantees inherent to Rust.
• Bash Compatibility
  Brush strives to be compatible with bash scripting and syntax, meaning users can leverage their existing knowledge and scripts without needing to learn an entirely new shell language or rewrite existing automation.
• Open Source
  Brush is an open-source project, allowing the community to contribute, inspect the code, report bugs, and help shape the direction of the shell's development.
• Written in Rust
  Being implemented in Rust provides memory safety, thread safety, and modern software engineering practices, potentially reducing bugs and security vulnerabilities compared to shells written in C.
• Cross-Platform Potential
  As a Rust-based project, Brush has the potential for good cross-platform support, making it easier to run on various operating systems including Linux, macOS, and potentially Windows.

Possible disadvantages

• Early Stage / Incomplete
  Brush is still in active development and may not yet support all bash features, built-in commands, or edge cases, which could lead to incompatibilities when running complex scripts.
• Small Community
  Compared to established shells like bash, zsh, or fish, Brush has a much smaller user community, meaning fewer resources, tutorials, plugins, and community-driven support are available.
• Limited Ecosystem
  Brush lacks the extensive ecosystem of plugins, frameworks, and customization tools that mature shells like zsh (with Oh My Zsh) or fish enjoy, which may limit its appeal for power users.
• Potential Compatibility Gaps
  Despite aiming for bash compatibility, achieving full parity with decades of bash behavior and quirks is extremely challenging, and users may encounter subtle differences or missing features that break their workflows.
• Unproven in Production
  As a relatively new project, Brush hasn't been battle-tested in production environments at scale, so relying on it for critical systems or workflows carries more risk compared to well-established shells.

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• Trying to Set-up android9(ver6) in VirtualBox

  Well now I'm at the point that I see it's calling for the Korn shell, which I'm not directly familiar with, and seemed to stop on the mouse input driver. I'll change my VBox mouse device settings and see what happens from there... Source: over 4 years ago

Tracking brush since May 2026.