I install pry and try to use it. gem pry require ‘pry’ #………. binding.pry

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Asked: June 16, 20262026-06-16T07:03:50+00:00 2026-06-16T07:03:50+00:00

I install pry and try to use it. gem pry require ‘pry’ #………. binding.pry

0

I install pry and try to use it.

gem "pry"    

require 'pry'
#..........
binding.pry

But there are 3 issues :

I don’t know to go to the next string (not to the next break point) or watch the value of a variable. There is no information about it!
there is a lot of different prys! pry-debug, pry, pry-db and so on and so forth. Which one should I use?
It stops there it should. But I don’t know yet (and didn’t find) how to watch the variable’s value or how to go to the next line. And it always gives in a few seconds a kind of an error below:

pry(#)> Error: execution expired
/var/lib/gems/1.9.1/gems/pry-0.9.10/lib/pry/pry_instance.rb:600:in `getbyte'
/var/lib/gems/1.9.1/gems/pry-0.9.10/lib/pry/pry_instance.rb:600:in `readline'
/var/lib/gems/1.9.1/gems/pry-0.9.10/lib/pry/pry_instance.rb:600:in `block in readline'
/var/lib/gems/1.9.1/gems/pry-0.9.10/lib/pry/pry_instance.rb:544:in `handle_read_errors'
/var/lib/gems/1.9.1/gems/pry-0.9.10/lib/pry/pry_instance.rb:589:in `readline'
/var/lib/gems/1.9.1/gems/pry-0.9.10/lib/pry/pry_instance.rb:369:in `retrieve_line'
/var/lib/gems/1.9.1/gems/pry-0.9.10/lib/pry/pry_instance.rb:304:in `block in r'
/var/lib/gems/1.9.1/gems/pry-0.9.10/lib/pry/pry_instance.rb:301:in `loop'
/var/lib/gems/1.9.1/gems/pry-0.9.10/lib/pry/pry_instance.rb:301:in `r'
/var/lib/gems/1.9.1/gems/pry-0.9.10/lib/pry/pry_instance.rb:271:in `re'
/var/lib/gems/1.9.1/gems/pry-0.9.10/lib/pry/pry_instance.rb:251:in `rep'
/var/lib/gems/1.9.1/gems/pry-0.9.10/lib/pry/pry_instance.rb:231:in `block (3 levels) in repl'
/var/lib/gems/1.9.1/gems/pry-0.9.10/lib/pry/pry_instance.rb:230:in `loop'
/var/lib/gems/1.9.1/gems/pry-0.9.10/lib/pry/pry_instance.rb:230:in `block (2 levels) in repl'
/var/lib/gems/1.9.1/gems/pry-0.9.10/lib/pry/pry_instance.rb:229:in `catch'
/var/lib/gems/1.9.1/gems/pry-0.9.10/lib/pry/pry_instance.rb:229:in `block in repl'
/var/lib/gems/1.9.1/gems/pry-0.9.10/lib/pry/pry_instance.rb:228:in `catch'
/var/lib/gems/1.9.1/gems/pry-0.9.10/lib/pry/pry_instance.rb:228:in `repl'
/var/lib/gems/1.9.1/gems/pry-0.9.10/lib/pry/pry_class.rb:154:in `start'
/var/lib/gems/1.9.1/gems/pry-0.9.10/lib/pry/core_extensions.rb:22:in `pry'
/home/alex/Documents/ruby/my_projects/controllers/my_controller.rb:24:in `block in '
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:1265:in `call'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:1265:in `block in compile!'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:835:in `[]'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:835:in `block (3 levels) in route!'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:851:in `route_eval'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:835:in `block (2 levels) in route!'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:872:in `block in process_route'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:870:in `catch'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:870:in `process_route'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:834:in `block in route!'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:833:in `each'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:833:in `route!'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:936:in `dispatch!'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:769:in `block in call!'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:921:in `block in invoke'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:921:in `catch'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:921:in `invoke'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:769:in `call!'
/home/alex/Documents/ruby/my_projects/app.rb:21:in `block in '
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:1265:in `call'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:1265:in `block in compile!'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:835:in `[]'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:835:in `block (3 levels) in route!'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:851:in `route_eval'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:835:in `block (2 levels) in route!'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:872:in `block in process_route'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:870:in `catch'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:870:in `process_route'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:834:in `block in route!'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:833:in `each'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:833:in `route!'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:936:in `dispatch!'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:769:in `block in call!'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:921:in `block in invoke'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:921:in `catch'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:921:in `invoke'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:769:in `call!'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:755:in `call'
/var/lib/gems/1.9.1/gems/rack-flash3-1.0.1/lib/rack/flash.rb:120:in `call'
/var/lib/gems/1.9.1/gems/rack-timeout-0.0.3/lib/rack/timeout.rb:16:in `block in call'
/usr/lib/ruby/1.9.1/timeout.rb:68:in `timeout'
/var/lib/gems/1.9.1/gems/rack-timeout-0.0.3/lib/rack/timeout.rb:16:in `call'
/var/lib/gems/1.9.1/gems/rack-1.4.1/lib/rack/session/abstract/id.rb:205:in `context'
/var/lib/gems/1.9.1/gems/rack-1.4.1/lib/rack/session/abstract/id.rb:200:in `call'
/var/lib/gems/1.9.1/gems/rack-protection-1.2.0/lib/rack/protection/xss_header.rb:22:in `call'
/var/lib/gems/1.9.1/gems/rack-protection-1.2.0/lib/rack/protection/path_traversal.rb:16:in `call'
/var/lib/gems/1.9.1/gems/rack-protection-1.2.0/lib/rack/protection/json_csrf.rb:17:in `call'
/var/lib/gems/1.9.1/gems/rack-protection-1.2.0/lib/rack/protection/base.rb:47:in `call'
/var/lib/gems/1.9.1/gems/rack-protection-1.2.0/lib/rack/protection/xss_header.rb:22:in `call'
/var/lib/gems/1.9.1/gems/rack-1.4.1/lib/rack/logger.rb:15:in `call'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:129:in `call'
/var/lib/gems/1.9.1/gems/rack-1.4.1/lib/rack/head.rb:9:in `call'
/var/lib/gems/1.9.1/gems/rack-1.4.1/lib/rack/methodoverride.rb:21:in `call'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/showexceptions.rb:21:in `call'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:99:in `call'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:1389:in `block in call'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:1471:in `synchronize'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:1389:in `call'
/var/lib/gems/1.9.1/gems/rack-1.4.1/lib/rack/builder.rb:134:in `call'
/var/lib/gems/1.9.1/gems/rack-1.4.1/lib/rack/urlmap.rb:64:in `block in call'
/var/lib/gems/1.9.1/gems/rack-1.4.1/lib/rack/urlmap.rb:49:in `each'
/var/lib/gems/1.9.1/gems/rack-1.4.1/lib/rack/urlmap.rb:49:in `call'
/var/lib/gems/1.9.1/gems/rack-1.4.1/lib/rack/lint.rb:48:in `_call'
/var/lib/gems/1.9.1/gems/rack-1.4.1/lib/rack/lint.rb:36:in `call'
/var/lib/gems/1.9.1/gems/rack-1.4.1/lib/rack/showexceptions.rb:24:in `call'
/var/lib/gems/1.9.1/gems/rack-1.4.1/lib/rack/commonlogger.rb:20:in `call'
/var/lib/gems/1.9.1/gems/sinatra-1.3.3/lib/sinatra/base.rb:136:in `call'
/var/lib/gems/1.9.1/gems/rack-1.4.1/lib/rack/chunked.rb:43:in `call'
/var/lib/gems/1.9.1/gems/rack-1.4.1/lib/rack/content_length.rb:14:in `call'
/var/lib/gems/1.9.1/gems/rack-1.4.1/lib/rack/handler/webrick.rb:59:in `service'
/usr/lib/ruby/1.9.1/webrick/httpserver.rb:138:in `service'
/usr/lib/ruby/1.9.1/webrick/httpserver.rb:94:in `run'
/usr/lib/ruby/1.9.1/webrick/server.rb:191:in `block in start_thread'
pry(#)>

Alright, I install

gem "debugger"

and add the breakpoint

debugger

Nothing happens at all.

Log file is not what I’m looking for. I just want to debug a Sinatra application. How do I do that?

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1 Answer

Editorial Team · Answer 1 · 2026-06-16T07:03:51+00:00

Editorial Team

2026-06-16T07:03:51+00:00Added an answer on June 16, 2026 at 7:03 am

In your Gemfile:

gem "pry"
gem "pry-nav"

Run bundle. Then whenever the script encounters binding.pry, you will have a shell opened. You can see where you are with whereami, you move to the next line with next, continue running the script with continue. If you want to inspect a variable, just type its name.

See pry-nav for more info.

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