Pry (software)

Pry REPL
Developers	John Mair (banisterfiend), Conrad Irwin, …many more
Stable release	0.11.1 / September 26, 2017 (2017-09-26)
Written in	Ruby
Operating system	Cross-platform
Platform	Ruby interpreter
Type	Ruby shell
License	[3] MIT License
Website	pry.github.io
Repository	github.com/pry/pry

Pry is an interactive shell for the Ruby programming language. It is notable for its Smalltalk-inspired¹ ability to start a REPL within a running program. This lets programmers debug and modify the current state of a system.

Pry exposes most of its introspective capabilities using a filesystem metaphor.² For example, it has a cd command to start interacting with a particular object, and uses ls to list methods and variables.

It is possible to start Pry at any point inside a running program.³ Due to the reflective nature of Ruby, this lets the programmer inspect the program, change its current state, or correct the source code without restarting the process.

A number of third party plugins are available for Pry,¹ these add tighter integration with other Ruby projects, enhance the abilities of Pry itself, and make Pry available over a remote connection.