If you have a large file of data that you are trying to import, or a log file you are trying to dissect then you'll rarely want to print it directly out to the screen. Using commands like more or programs like vim can make things a little easier but you still have to run through potentially thousands of lines to find the correct block.
To load a few specific lines from a file you can use a combination of the head and tail commands. The following command will print out lines 200 to 220 from a large file called 'bigfile. The head command will print out the first 220 lines from a file, which is then piped into a tail command that prints out only the last 20 lines of the output generated by the previous command.
head -n 220 bigfile | tail -n 21
Alternatively, you can use sed to print out the same block from the large file.