tput clear or
clear (to clear the screen), though common is not a standard command.
tput clear and
printf are standard, the escape sequence to clear the screen may vary from terminal to terminal,
tput clear would query the termcap or terminfo databases for the sequence for the terminal specified with the
$TERM environment variable; with
printf, here we hard code the sequence for DEC terminals (starting with the VT100 terminal from the late 70s) and as specified by ANSI X3.64 where
\33[H takes the cursor to the home position, and
\33[J clears til the end of the screen (leaving scrollback buffer and alternate screen, where supported, alone) which is recognised by most terminals and terminal emulators.