Pry (software)

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Developer(s)John Mair (banisterfiend), Conrad Irwin, …many more
Stable release
0.11.1 / September 26, 2017 (2017-09-26)
Written inRuby
Operating systemCross-platform
PlatformRuby interpreter
TypeRuby shell
MIT License

Pry is an interactive shell for the Ruby programming language. It is notable for its Smalltalk-inspired[1] 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.

See also[edit]


  1. ^ a b The Pry Ecosystem — John Mair, 2012 link
  2. ^ Pry — Reuven M. Lerner, LinuxJournal, July 2012, pp28 link, or [1]
  3. ^ Interactive Debugging With Pry — Alan MacDougall, 2012 link, or [2]

External links[edit]