I have a file called "data_prova.dat" in my folder, as you can see:
gnuplot> !ls
data_prova.dat
But when I ask gnuplot to plot it, it says:
warning: Skipping unreadable file "./data_prova.dat"
No data in plot
which is just false, because:
wc -c data_prova.dat
2640413132 data_prova.dat
Can this be because the file is too large?