I have the rake tasks in my rails application. i want to run a commandline commands with in rake task. how can i do this. i tried by the following but fails
desc "Sending the newsletter to all the users"
task :sending_mail do
run "cd #{RAILS_ROOT} && ar_sendmail -o -t NewsLetters -v"
system "cd #{RAILS_ROOT} && ar_sendmail -o -t NewsLetters -v &"
end
The above run command throws run method undefined & System command not throwing any errors but not executed.
Rake sh built-in task
This is probably the best method:
task(:sh) do
sh('echo', 'a')
sh('false')
sh('echo', 'b')
end
The interface is similar to Kernel.system but:
echo b
run is used by Capistrano and other things for launching commands, but Rake often makes use of Kernel#system instead.
Your command might be being run, but not working. Why not make a wrapper shell script you can test independently, or try and kick off using the full path:
newsletter_script = File.expand_path('ar_sendmail', RAILS_ROOT)
if (File.exist?(newsletter_script))
unless (system(newsletter_script + ' -o -t NewsLetters -v &'))
STDERR.puts("Script #{newsletter_script} returned error condition")
end
else
STDERR.puts("Could not find newsletter sending script #{newsletter_script}")
end
It would seem odd to have your script not in scripts/
The system call should return true on success. If this is not the case, either the script returned an error code, or the command could't be run.
File.expand_path is used to...expand paths, basically. It will properly join two paths together, like appending ar_sendmail on your Rails path, whatever that is. It's also good for eliminating things like ../../ when required, giving you the proper, full path.ar_sendmail is otherwise you won't be able to launch it properly. Your shell has a PATH which can differ from what Ruby will use, and that can make scripts work even when they're not in the directory you're in.This links may help you run command line command into ruby ...
http://zhangxh.net/programming/ruby/6-ways-to-run-shell-commands-in-ruby/
Calling shell commands from Ruby
http://blog.jayfields.com/2006/06/ruby-kernel-system-exec-and-x.html
%x[command].each do |f|
value = f
end
#sh. It has the shortcoming of using /bin/sh, not bash however.To use bash from Rake's sh method, see this answer to a duplicate question: stackoverflow.com/questions/9796028/…