Linux Common commands: Head command

Head and tail are as simple as their name, which is used to display the beginning or end of a number of chunks of text, the head is used to display the beginning of the file to the standard output, and tail to see the end of the file.

1. Command format:

Head [parameters] ... [File] ...

2. Command function:

The head is used to display the beginning of the file to the standard output, and the default head command prints the first 10 lines of its corresponding file.

3. Command parameters:

-Q Hide file names

-V Show file name

-c< bytes > Display bytes

-n< rows > rows displayed

4. Usage examples:

Example 1: Display the first n rows of a file

Command:

Head-n 5 Log2014.log

Output:

[Email protected] test]#CatLog2014.log the- on the- Geneva the-Geneva the-Geneva the- to the- . the- - the- , the- the the-Ten the- One the- A==============================[email protected] test]#Head-N5Log2014.log the- on the- Geneva the-Geneva the-Geneva the- to[Email protected] test]#

Example 2: Displaying the first n bytes of a file

Command:

Head-c Log2014.log

Output:

Head  - Log2014.log -[Email protected] test]#

Example 3: The file's contents except the last N bytes

Command:

Head-c -32 Log2014.log

Output:

[Email protected] test]#Head-C- +Log2014.log the- on the- Geneva the-Geneva the-Geneva the- to the- . the- - the- , the- the the-Ten the- One the- A[Email protected] test]#

Example 4: Output file except the last n rows of the entire content

Command:

Head-n-6 Log2014.log

Output:

Head -N-6  log2014.log---- Geneva ----07 [email protected] test]#

Linux Common commands: Head command