1. Linux 系统登录之后,显示如下
Last login: Thu Jan 1 00:00:22 UTC 1970 on ttyS0 Linux xxx 4.1.6 #1 PREEMPT Wed Jul 19 13:15:08 CST 2017 armv7l
那么这些信息是哪里获取到的呢,比如Jul19 13:15....
Kernel每次编译的时间在源码的什么位置?
include/generated/compile.h
2. Kernel版本信息存放在源码什么位置?
include/generated/utsrelease.h
3. 如何定制自己的登录前后信息?
/etc/issue, 可以选择在这里做登录提示,或者项目标志打印, 可以选择 l可以看到hostname和tty登录信息
/etc/issue: 登录之前提示信息
/etc/motd: 登录之后提示信息
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/etc/issue – escape code The issue-file (/etc/issue or the file set with the -f option) may contain 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. : 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 : Insert the nodename of the machine, also known as the hostname. o : Insert the domainname of the machine. : Insert the release number of the OS, eg. 1.1.9. : Insert the current time. u : Insert the number of current users logged in. U : Insert the string “1 user” or “ users” where is the number of current users logged in. v : Insert the version of the OS, eg. the build-date etc.
4. 如何查看系统的登录信息和一些操作log?
/var/log/auth.log