我已经成功安装了SASS，之后，当我运行命令＆＃34; sass＆＃34;时，它并不存在。我做错了什么？
[dane@dev-vpc-01 home]$ sudo gem install sass --no-user-install
Successfully installed sass-3.5.5
Parsing documentation for sass-3.5.5
Done installing documentation for sass after 14 seconds
1 gem installed
[dane@dev-vpc-01 home]$ sass
bash: sass: command not found
[dane@dev-vpc-01 home]$ which sass
/usr/bin/which: no sass in (/sbin:/bin:/usr/sbin:/usr/bin:/opt/aws/bin)