messing with lines

tput.sh

#!/bin/bash

# os::text::save_cursor saves the current cursor position if it is called in a TTY
# to allow us to provide os::text::clear_from_saved_cursor
function os::text::save_cursor() {
	if [ -t 1 ]; then
		tput sc
	fi
}

# os::text::clear_from_saved_cursor clears all terminal contents from the last saved
# cursor if it is called in a TTY
function os::text::clear_from_saved_cursor() {
	if [ -t 1 ]; then
		tput rc
		tput ed
	fi
}

for (( i = 0; i < 10; i++ )); do
	echo "interstitial line $i"
	os::text::save_cursor

	for (( j = 0; j < ${COLUMNS}; j++ )); do
		for (( k = 0; k < "${ROWS}"; k++ )); do
			echo -n "X"
		done
	done
	
	os::text::clear_from_saved_cursor
done