Upgrade to Brush Shell 0.4.0 for Enhanced Security and Expanded Compatibility

Brush Shell 0.4.0 Enhancements

Brush, a rust-based alternative to traditional Unix shells, has released version 0.4.0, introducing significant improvements in script safety and platform support.

Script Safety Enhancements

• The set -e feature, mirroring bash’s exemption rules, has been implemented.
• set -u now generates an error when encountering unset variable references.
• The failglob option treats no-match globs as errors.
• The ERR trap has been implemented in conjunction with earlier EXIT trap work.

Platform Support Improvements

• Coprocess support is now available via the coproc command.
• A new --noglob or -f command-line flag has been added.
• Unknown command-line options now exit with code 2, aligning with bash behavior.
• Arithmetic handling has been refined, including high-radix literals, overflow and underflow behavior, and infinite-recursion detection.

Interactive Features

• An opt-in TOML configuration file at ~/.config/brush/config.toml allows for brush-specific settings outside shell scripts.
• Zsh-style preexec and precmd hooks are available behind an experimental flag.
• Terminal integration with semantic prompt and command marking can be enabled similarly.
• Readline macro support has been added, with subsequent work addressing real-world inputrc forms.

API Changes

• Embedders can add custom builtins and variable behavior without forking using API changes.
• The Shell type is now generic over a ShellExtensions parameter, providing a hook for embedders.

Brush is freely available on GitHub under the MIT license through crates.io, Homebrew, Arch Linux’s extra repository, and Nix.

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Vaibhav

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