ubuntu出现乱码，而且开机登陆完出现好多关于PATH environment的错误

Last login: Thu Aug 2 16:29:10 2012 from 115.24.161.140
Command 'uname' is available in '/bin/uname'
The command could not be located because '/bin' is not included in the PATH environment variable.
uname: command not found
-bash: [: =: 期待ä¸