I have a very big text file, about 80GB, and I need to cut a part form it that lies between two given lines. The part I need is not big, and I have not enough space left on the hard drive to do things like:
head -n 10000000 filename > auxiliary_part tail -n 1000 auxiliary_part > needed_part How do I do that?
sed -n '3,10p' big-file.txt > your-section.txt Replace 3 and 10 with your range of lines. The sed commands basically says print (p) everything between lines 3 and 10. The -n tells it to do it quietly, otherwise it prints out the input as its reading the file.
q command so that sed can skip the rest of the file. Something like 3,$p;10q would work and keep you from having to repeat the ending line number. Pipe one to the other:
head -n 10000000 filename | tail -n 1000 > needed_part 