Shell logon information
Local terminal login information: / etx / issue (only on tty1-tty6 effective, remote login is invalid)
\ D displays the current system date
\ S displays the operating system name
\ L display terminal No. login
\ M display hardware architecture
\ N display hostname
\ O Display domain
\ R displays the kernel version
\ T displays the current system time
\ U Displays the current logged-in user's serial number
Remote terminal login: /etx/issue.net
Escape can not be used in file /etx/issue.net
Whether to display the logon information in the ssh configuration file / etc / ssh / sshd_config decision, adding "Banner /etc/issue.net" line before they can be displayed.
Welcome message after login: / etc / motd
Log on locally and remote login can be displayed in this welcome message.