When you first boot up your new LFS system, the logon screen will be
nice and plain (as it should be in a bare-bones system). Many people
however, will want their system to display some information in the
logon message. This can be accomplished using the file /etc/issue.
The /etc/issue file is a plain text
file which will also accept certain escape sequences (see below) in
order to insert information about the system. There is also the file
issue.net which can be used when
logging on remotely. ssh however, will only use it if
you set the option in the configuration file and will not interpret the escape sequences shown
below.
One of the most common things which people want to do is clear the
screen at each logon. The easiest way of doing that is to put a
"clear" escape sequence into /etc/issue. A simple way of doing this is to issue
the command clear >
/etc/issue. This will insert the relevant escape code
into the start of the /etc/issue file.
Note that if you do this, when you edit the file, you should leave
the characters (normally '^[[H^[[2J') on the first line alone.
![[Note]](../images/note.png)
Note
Terminal escape sequences are special codes recognized by the terminal. The ^[ represents an ASCII ESC character. The sequence ESC [ H puts the cursor in the upper left hand corner of the screen and ESC 2 J erases the screen. For more information on terminal escape sequences see https://invisible-mirror.net/xterm/ctlseqs/ctlseqs.html
The following sequences are recognized by agetty (the program which usually
parses /etc/issue). This information is
from man agetty where
you can find extra information about the logon process.
The issue file can contain certain
character sequences to display various information. All issue sequences consist of a backslash (\)
immediately followed by one of the letters explained below (so
\d in /etc/issue would insert the current date).
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, e.g., i686.
n Insert the nodename of the machine, also known as the hostname.
o Insert the domainname of the machine.
r Insert the release number of the kernel, e.g., 2.6.11.12.
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
number of current users logged in.
v Insert the version of the OS, e.g., the build-date etc.