07-25-2017
Quote:
how to change behaviour of standard Linux login window?
I am not really sure what you mean by that: Linux has no "login window".
Linux (like UNIXes, to which it is quite similar) has a "login" process. Whenever a terminal becomes free, this login process will start a session there and present a (text-based) login/password prompt.
What you perhaps mean by "login window" is the following: many graphical environments (GNOME, KDE, ....) don't deem it reasonable that the user uses the described login process and then start whatever graphical environment he wants. They basically intercept the login process and replace it with their own graphical version of it. Search for "gdm" (graphical display manager) for a detailed descrition of how this works.
This doesn't mean you have to use it, though. you can still trigger the native login process and use it to log in a user at the system. You will probably make use of "udev"-rules: "udev" is a kernel driver that constantly scans the system for changes in hardware. If you, for instance, put in a CD into the CD-ROM-drive and you get a nice symbol on your desktop, this is (ultimately)
udev at work. udev works from a rule-set which basically states "if this and this happens execute this list of actions".
I hope this helps.
bakunin
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UL(1) User Commands UL(1)
NAME
ul - do underlining
SYNOPSIS
ul [options] [file ...]
DESCRIPTION
ul reads the named files (or standard input if none are given) and translates occurrences of underscores to the sequence which indicates
underlining for the terminal in use, as specified by the environment variable TERM. The terminfo database is read to determine the appro-
priate sequences for underlining. If the terminal is incapable of underlining but is capable of a standout mode, then that is used
instead. If the terminal can overstrike, or handles underlining automatically, ul degenerates to cat(1). If the terminal cannot under-
line, underlining is ignored.
OPTIONS
-i, --indicated
Underlining is indicated by a separate line containing appropriate dashes `-'; this is useful when you want to look at the underlin-
ing which is present in an nroff output stream on a crt-terminal.
-t, -T, --terminal terminal
Overrides the terminal type specified in the environment with TERM.
-V, --version
Display version information and exit.
-h, --help
Display a help text and exit.
ENVIRONMENT
The following environment variable is used:
TERM The TERM variable is used to relate a tty device with its device capability description (see terminfo(5)). TERM is set at login
time, either by the default terminal type specified in /etc/ttys or as set during the login process by the user in their login file
(see setenv(1)).
SEE ALSO
colcrt(1), login(1), man(1), nroff(1), setenv(1), terminfo(5)
BUGS
Nroff usually outputs a series of backspaces and underlines intermixed with the text to indicate underlining. No attempt is made to opti-
mize the backward motion.
HISTORY
The ul command appeared in 3.0BSD.
AVAILABILITY
The ul command is part of the util-linux package and is available from Linux Kernel Archive <ftp://ftp.kernel.org/pub/linux/utils/util-
linux/>.
util-linux September 2011 UL(1)