In case of the first, you can call the program using system().
In case of the latter, things get tricky - you need a pipe to the program to supply it the filename, but you also need to read its results. A pipe to it could be done using
open my $prog, "|program"; print $prog "$filename\n";
Reading its results could be done using backticks as in
`program`. To combine both however, you need
IPC::Open2.
Update: (Hours later.) Oopsie. Has to be
print $prog "$filename\n";
and not
print $prog, "$filename\n";
of course. I'm surprised noone caught else this sooner.
Makeshifts last the longest.
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