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I'm in Chapter 6 of the RoR Tutorial and can't seem to get the command 'tail -f log/development.log' to work. Using Mac OS X 10.6.6, Ruby 1.9.2, Rails 3.0.3 with RVM. I'm trying to run it in a sanboxed Rails console, here's the output of what's going on:
Trenton-Scotts-MacBook-Air:sample_app TTS$ rails c --sandbox
Loading development environment in sandbox (Rails 3.0.3)
Any modifications you make will be rolled back on exit
ruby-1.9.2-p136 :001 > tail -f log/development.log
SyntaxError: (irb):1: syntax error, unexpected tIDENTIFIER, expecting keyword_do or '{' or '('
tail -f log/development.log
^
from /Users/TTS/.rvm/gems/ruby-1.9.2-p136/gems/railties-3.0.3/lib/rails/commands/console.rb:44:in `start'
from /Users/TTS/.rvm/gems/ruby-1.9.2-p136/gems/railties-3.0.3/lib/rails/commands/console.rb:8:in `start'
from /Users/TTS/.rvm/gems/ruby-1.9.2-p136/gems/railties-3.0.3/lib/rails/commands.rb:23:in `<top (required)>'
from script/rails:6:in `require'
from script/rails:6:in `<main>'
ruby-1.9.2-p136 :002 >
Any thoughts?
409
Rails is configured to create separate log files for each of the three default environments: development, test and production. By default it puts these log files in the log/ directory of your project. So if you open up that folder you'll see a development. log and test.
Rails makes use of the ActiveSupport::Logger class to write log information. Other loggers, such as Log4r , may also be substituted. By default, each log is created under Rails. root/log/ and the log file is named after the environment in which the application is running.
Rails uses six different log levels: debug, info, warn, error, fatal, and unknown. Each level defines how much information your application will log: Debug: diagnostic information for developers and system administrators, including database calls or inspecting object attributes. This is the most verbose log level.
One of the best tools in a rails developers arsenal is the rails console, being extremely useful for brainstorming, debugging, and testing. Having it log active record queries directly to the console can improve readability and convenience over looking through the development logs to see what SQL queries have been run.
Tail is not a Ruby command. You should run it directly in terminal:
$ tail -f logs/development.log
#=> output
#=> ctrl+c
$ rails c --sandbox
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