To output, even if to a screen. If a hacker says that a program
printed a message
, he means this; if he refers to printing a
file, he probably means it in the conventional sense of writing to a
hardcopy device (compounds like ‘print job’ and
‘printout’, on the other hand, always refer to the
latter). This very common term is likely a holdover from the days when
printing terminals were the norm, perpetuated by programming language
constructs like C's
printf3.
See senses 1 and 2 of tty.