On my debian system,
/usr/bin/tput are part of the
ncurses-bin package, and
/usr/bin/clear_console is part of the
Why should the default
.bash_logout assume that the
ncurses-bin package is installed?
Also, if run from a Linux virtual terminal (not from a serial or pseudo tty)
clear_console(1) will also clear the scrollback buffer (in addition to sending the
cl terminfo escape).
It will do that by switching back and forth to another vt , and by sending the
\e[3J "flush scrollback" escape.
On newer systems,
tput clear will also send that
\e[3J escape (but not on many distros still in use, eg. Centos 7 or Debian 9 -- on the latter, the
TERM environment variable should be set to
linux3.0, which is not the default).
See the source of
 which may be defeated by the
vgacon.scrollback_persistent=1 boot param, if your kernel was compiled with the
VGACON_SOFT_SCROLLBACK option ("Enable Scrollback Buffer in System RAM").