如何清除linux 緩存??

我菜我怕誰

我用putty遠(yuǎn)程登陸一臺(tái)開ssh服務(wù)的linux機(jī)器.聯(lián)結(jié)時(shí)候出現(xiàn)如下:

the server's host key is not cached in the registry . you have no guarantee that the server is the computer you think it is.
the server's rsa2 key fingerprint is : ssh-rsa 1024 34:43:45:d4:.....
if you trust this host, hit yes to add the key to pietty's cache and carry on connecting . if you want to carry on connecting just once ,without adding the key to the cache , hit No . if you do not trust this host , hit cancel to abandon the connection.

請(qǐng)問如果我選擇" YES"　，那么我怎么才能　清除linux 上的緩存，讓我的機(jī)器每次登陸這臺(tái)linux 都出現(xiàn)這個(gè)提示？？？
高手幫忙！��！謝謝�。�！