Ruby 1.8没有显示在命令行上

Question

我已经从命令行在我的Ubuntu机器上安装了ruby1.8。但系统显示尚未安装ruby。

这是控制台输出：

frank@my-version3:~/apps$ sudo apt-get install ruby1.8 ruby1.8-dev irb rdoc ri
Reading package lists... Done
Building dependency tree       
Reading state information... Done
ruby1.8 is already the newest version.
ruby1.8-dev is already the newest version.
irb is already the newest version.
rdoc is already the newest version.
ri is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

frank@my-version3:~/apps$ which ruby

frank@my-version3:~/apps$ ruby -v
-bash: ruby: command not found

frank@my-version3:~/apps$ ruby
-bash: ruby: command not found

frank@my-version3:~/apps$ irb
irb(main):001:0> exit

frank@my-version3:~/apps$ 

任何想法可能出错？

Answer 1

你可以使用update-alternatives做到这个

update-alternatives --set ruby /usr/bin/ruby1.8 

获取备选方案列表

update-alternatives --query ruby

更新：对于可能遇到同样问题的用户，请参阅this link

Answer 2

在'cd'ing之后你能看到/ usr / bin中的ruby吗？您还可以运行 echo $ PATH 以查看您的路径是否设置正确。