假设我认为我安装了SVN。我运行命令，得到以下输出：
aoneill@aoneill-Laptop:~/Documents$ svn
The program 'svn' is currently not installed. You can install it by typing:
sudo apt-get install subversion
我的问题是：我可以更改输出，或者发现这样的情况，说出类似下面的内容，并在最后提示？
aoneill@aoneill-Laptop:~/Documents$ svn
The program 'svn' is currently not installed. You can install it by typing:
sudo apt-get install subversion
Install the package? [y/n]
谢谢！它会使包装处理更好！