Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)

问题:

I am trying to run mysql client on my terminal. I have installed the latest mysql gem.

   ~ git:(master)  ruby -v     ruby 1.8.7 (2010-01-10 patchlevel 249) [universal-darwin11.0]       ~ git:(master)  rails -v     Rails 2.3.14       ~ git:(master)  which mysql     mysql: aliased to nocorrect mysql       ~ git:(master)  which ruby     /usr/bin/ruby       ~ git:(master)  which rails     /usr/bin/rails       ~ git:(master)  gem list  *** LOCAL GEMS ***  actionmailer (2.3.14) actionpack (2.3.14) activerecord (2.3.14) activeresource (2.3.14) activesupport (2.3.14) builder (2.1.2) bundler (1.0.21) capistrano (2.9.0) capybara (0.3.9) cgi_multipart_eof_fix (2.5.0) childprocess (0.2.2) columnize (0.3.4, 0.3.3) cucumber (0.9.4) cucumber-rails (0.3.2) culerity (0.2.15) daemons (1.1.4) database_cleaner (0.6.7) diff-lcs (1.1.3) expertiza-authlogic (2.1.6.1) fastercsv (1.5.4) fastthread (1.0.7) ffi (1.0.10, 1.0.9) gdata (1.1.2) gem_plugin (0.2.3) gherkin (2.2.9) highline (1.6.2) hoptoad_notifier (2.4.11) json (1.4.6) json_pure (1.6.1) linecache (0.46) mime-types (1.16) mongrel (1.1.5) mysql (2.8.1) mysql2 (0.3.7) net-scp (1.0.4) net-sftp (2.0.5) net-ssh (2.2.1) net-ssh-gateway (1.1.0) nokogiri (1.5.0) rack (1.1.2) rack-test (0.6.1) rails (2.3.14) rake (0.9.2) rbx-require-relative (0.0.5) rdoc (3.11) RedCloth (4.2.8) rgl (0.4.0) ruby-debug (0.10.4) ruby-debug-base (0.10.4) rubyzip (0.9.4) selenium-webdriver (2.8.0, 2.7.0