4 setterm --clear command require arguments for execution
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sudo sh -c "TERM=linux setterm -foreground black >/dev/tty0"
sudo sh -c "TERM=linux setterm -clear all >/dev/tty0"

This will change the font color to black, than clears the screen.

Or in a single line:

sudo sh -c "TERM=linux setterm -foreground black -clear all >/dev/tty0"

And set it back to normal:

sudo sh -c "TERM=linux setterm -foreground white -clear all >/dev/tty0"
sudo sh -c "TERM=linux setterm -foreground black >/dev/tty0"
sudo sh -c "TERM=linux setterm -clear >/dev/tty0"

This will change the font color to black, than clears the screen.

Or in a single line:

sudo sh -c "TERM=linux setterm -foreground black -clear >/dev/tty0"

And set it back to normal:

sudo sh -c "TERM=linux setterm -foreground white -clear >/dev/tty0"
sudo sh -c "TERM=linux setterm -foreground black >/dev/tty0"
sudo sh -c "TERM=linux setterm -clear all >/dev/tty0"

This will change the font color to black, than clears the screen.

Or in a single line:

sudo sh -c "TERM=linux setterm -foreground black -clear all >/dev/tty0"

And set it back to normal:

sudo sh -c "TERM=linux setterm -foreground white -clear all >/dev/tty0"
3 added 98 characters in body
source | link
sudo sh -c "TERM=linux setterm -foreground black >/dev/tty0"
sudo sh -c "TERM=linux setterm -clear >/dev/tty0"

This will change the font color to black, than clears the screen.

Or in a single line:

sudo sh -c "TERM=linux setterm -foreground black -clear >/dev/tty0"

And set it back to normal:

sudo sh -c "TERM=linux setterm -foreground white -clear >/dev/tty0"
sudo sh -c "TERM=linux setterm -foreground black >/dev/tty0"
sudo sh -c "TERM=linux setterm -clear >/dev/tty0"

This will change the font color to black, than clears the screen.

sudo sh -c "TERM=linux setterm -foreground black >/dev/tty0"
sudo sh -c "TERM=linux setterm -clear >/dev/tty0"

This will change the font color to black, than clears the screen.

Or in a single line:

sudo sh -c "TERM=linux setterm -foreground black -clear >/dev/tty0"

And set it back to normal:

sudo sh -c "TERM=linux setterm -foreground white -clear >/dev/tty0"
2 added 135 characters in body
source | link
sudo sh -c "TERM=linux setterm -foreground black >/dev/tty0"
sudo sh -c "TERM=linux setterm -clear >/dev/tty0"

This will change the font color to black, than clears the screen.

sudo sh -c "TERM=linux setterm -clear >/dev/tty0"
sudo sh -c "TERM=linux setterm -foreground black >/dev/tty0"
sudo sh -c "TERM=linux setterm -clear >/dev/tty0"

This will change the font color to black, than clears the screen.

    Notice added Insufficient explanation by ramblinjan
1
source | link