Head in Linux, TAIL,WC command

There are several commands for reading files in the Linux system: Head, tail, WC. Let's explain these commands.

1. Head: Show Previous lines

Head file: Display 1-10 rows (default is 10 rows)

Head-n file: Display 1-20 rows
Head-n -20 file: Displays 1-120 rows, 20 means no 20 rows are displayed

2. Tail: Show the following linesTail, similar to head, only describes the usage of "+":
Tail-n +100 file: Displays 10-140 rows, +100 means the first 99 rows are not displayed
If you want to display 10~20 line: head-n | Tail-n 10 This is a pipe command.

3. WC: How many words in the query file, how many lines, how many charactersExample: cat/etc/man.config | WC
- L: How many rows are listed- W: How many words are listed- m: lists how many characters

Head in Linux, TAIL,WC command