由于这个手册内容很多，所以我们使用/issue快速找到关于/etc/issue的相关内容作为参考。
connection and turn on auto-answer after 1 ring.)
/sbin/agetty -w -I ’ATE0Q1&D2&C1S0=1\015’ 115200 ttyS1
ISSUE ESCAPES
The issue-file (/etc/issue or the file set with the -f option) may con-
tain certain escape codes to display the system name, date and time
etc. All escape codes consist of a backslash (\) immediately followed
by one of the letters explained below.
b Insert the baudrate of the current line.
d Insert the current date.
s Insert the system name, the name of the operating system.
l Insert the name of the current tty line.
m Insert the architecture identifier of the machine, eg. i486
n Insert the nodename of the machine, also known as the hostname.
o Insert the NIS domainname of the machine.
O Insert the DNS domainname of the machine.
r Insert the release number of the OS, eg. 1.1.9.
t Insert the current time.
u Insert the number of current users logged in.
U Insert the string "1 user" or "<n> users" where <n> is the num-
ber of current users logged in.
v Insert the version of the OS, eg. the build-date etc.
Example: On my system, the following /etc/issue file:
This is \n.\o (\s \m \r) \t
displays as
This is thingol.orcan.dk (Linux i386 1.1.9) 18:29:30
这里我们找到\l可以解决显示当前登陆终端号问题，\n解决主机名问题，\t解决时间显示问题。既然找到了，那我们尝试修改/etc/issue文件。
#vi /etc/issue
CentOS release 6.8 (Final)
Kernel \r on an \m
\l
\n
time is \t
wq保存退出。
logout
显示如下
问题解决。
man的使用需要大家在平时的使用中慢慢摸索这样才会越用越得心应手。希望大家看了又所帮助。