How Linux displays a few lines of a file (in the middle of a few lines)

"One" starts at line No. 3000 and displays 1000 rows. The 3000~3999 row cat filename is displayed | Tail-n +3000 | Head-n 1000 "Two" display 1000 rows to 3000 rows cat filename| Head-n 3000 | Tail-n +1000 * Note the sequence decomposition of the two methods:    tail-n 1000: Show last 1000 lines    tail-n + 1000: Starting from 1000 lines, showing the head-n after 1000 rows    1000: Show front 1000 lines "three" with sed command  sed-n ' 5,10p ' filename so you can view only the lines 5th through 10th of the file.

How Linux displays a few lines of a file (in the middle of a few lines)