在公司中，当我登录到某些服务器时，将显示我的上次登录名和一个巨大的横幅：
me@my-laptop$ ssh the-server
Last login: Mon Feb 8 18:54:36 2016 from my-laptop.company.com
************************************************************************
* *
* C O M P A N Y I N F O R M A T I O N S Y S T E M S *
* *
* !WARNING! Your connection has been logged !WARNING! *
* *
* This system is for the use of authorized personnel only. *
* Individuals using this *computer system without authorization, *
* or in excess of their authority as determined by the Company *
* Code of Ethics and Acceptable Use Policy, are subject to having all *
* of their activities on this system monitored, recorded and/or *
* terminated by system personnel. *
* If such monitoring reveals possible evidence of criminal activity, *
* Company may provide said evidence to law enforcement officials, *
* in compliance with its confidentiality obligations and all *
* applicable national laws/regulations with regards to data privacy. *
* *
* This device is maintained by Company Department *
* admin@company.com *
************************************************************************
me@the-server$ 当然，我不希望每次登录时都显示这个巨大的横幅，但我想保留上次登录时间和主机。
如果我使用touch ~/.hushlogin该横幅，则不会显示该横幅，但也会丢失
最后的登录信息。实际上，什么都没有显示：
ssh the-server
me@the-server$如何删除横幅，但保留上次登录时间和主机，如下所示：
ssh the-server
Last login: Mon Feb 8 18:54:36 2016 from my-laptop.company.com
me@the-server$
last -w | grep "$USER" | head -n1 | perl -lane 'END{print "Last login: @F[3..6] $F[8] from $F[2]"}'因为lastlog要截断我的主机名。