在默认配置庆典在Ubuntu的，当你键入未安装软件的名称，庆典解释如何，如果如果它存在的可执行文件安装，或者如何，如果它不安装可执行文件具有非常接近的名字存在。例如使用emacs（我的机器上没有安装它）：
$ emacx
No command 'emacx' found, did you mean:
Command 'emacs' from package 'emacs23-lucid' (universe)
Command 'emacs' from package 'e3' (universe)
Command 'emacs' from package 'emacs23-nox' (main)
Command 'emacs' from package 'emacs24' (main)
Command 'emacs' from package 'emacs24-nox' (main)
Command 'emacs' from package 'emacs23' (main)
Command 'emacs' from package 'jove' (universe)
Command 'emacs' from package 'emacs24-lucid' (universe)
emacx: command not found
$ emacs
The program 'emacs' can be found in the …