What is GLOBSORT used for?

GLOBSORT is a new variable that controls the sorting order of filename expansions. You can sort globs by file size, modification time, access time, or numeric value directly within the shell.

What is the main advantage of Bash 5.3's new command substitution?

The new `${ command; }` syntax allows command execution without forking a subshell. This significantly reduces process overhead, making scripts much faster, especially when used inside loops.

How does the ${| command; } syntax work?

It executes a command and automatically captures the resulting output into the built-in `REPLY` variable. This simplifies code by removing the need for intermediate variable assignments.

Does Bash 5.3 support floating-point math natively?

Yes, Bash 5.3 introduces the `fltexpr` loadable builtin, which allows users to perform floating-point arithmetic without relying on external tools like `bc` or `awk`.

Bash 5.3 Features & Optimization

Name: Bash 5.3 Features & Optimization
Author: Jamie-BitFlight

byJamie-BitFlight

•

Developer Tools

Provides comprehensive guidance and code patterns for leveraging the latest Bash 5.3 release features, including non-forking command substitution and advanced builtins.

This skill equips Claude with specialized knowledge of the Bash 5.3 release, focusing on significant performance improvements and new syntax. It enables the creation of high-performance shell scripts using in-shell command substitution to avoid subshell overhead, utilizes the new GLOBSORT variable for precise file ordering, and implements advanced logic with new loadable builtins like floating-point math (fltexpr) and key-value arrays (kv). It is ideal for developers modernizing legacy scripts or building efficient, modern shell-based automation that requires high efficiency and reduced resource usage.

Key Features

0126 GitHub stars

02Enhanced interactive capabilities with Readline completion support in the read builtin (-E).

03Advanced file sorting control via the GLOBSORT variable (sort by size, mtime, or numeric).

04New loadable builtins for floating-point math (fltexpr), key-value arrays (kv), and date parsing (strptime).

05In-shell command substitution (${ command; }) for fork-free execution and high performance.

06Automatic output capture using the new REPLY variable capture syntax (${| command; }).

Use Cases

01Developing sophisticated shell scripts that require floating-point calculations or structured key-value data without external dependencies.

02Implementing complex file processing workflows using time or size-based glob sorting without external find/sort commands.

03Optimizing high-frequency loops by replacing expensive subshell-based command substitutions with in-shell execution.

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add jamie-bitflight/claude_skills bash-53-features

For use in Claude.ai and ChatGPT

Download Skill