清除scr不起作用

我一直没有能够使用“清除scr”命令，因为我得到以下错误：

root@server:~# clear The program 'clear' is currently not installed. You can install it by typing: apt-get install ncurses-bin bash: clear: command not found root@server:~# apt-get install ncurses-bin Reading package lists... Done Building dependency tree Reading state information... Done ncurses-bin is already the newest version. 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. 

我正在使用Ubuntu Server 9.10。

前一阵子我用ncurses库做了一些开发，所以我毫无疑问的破了一些东西。