tsoome_, echho -e gives a new line , ctrl-v esc gives ^[

ye, your goal is to output sequence ESC and c - that should reset the terminal.

still question marks afterwards

is it gnu (df? was it?)

/bin/df -h gives meaningful output. which df / /opt/local/bin/df gives questionmarks

ok so /opt/local/bin/df is likely gnu version - could it be colored output? try env NO_COLOR=true /opt/local/bin/df otherwise, send its output to file, confirm the ? marks are still in faile (cat file) and mail me the sample, lets see what is actually going on there...