Linux Learning Note 26--command WC

The function of the WC (Word Count) command in a Linux system is to count the number of rows, words, and bytes in the specified file, and display the results of the statistics as output.

1. Command format:

WC [Options] File ...

2. Command function:

Counts the number of lines, words, and bytes in the specified file, and displays the results of the statistics as output. This command counts the number of lines, words, and bytes in the specified file. If the file name is not given, it is read from the standard input. The WC also gives the president count of the files specified.

3. Command parameters:

-C Count bytes.

-L counts the number of rows.

-M counts the number of characters. This flag cannot be used with the-C flag.

-W count words. A word is defined as a string separated by a blank, a jump, or a newline character.

-L Prints the length of the longest line.

-HELP Display Help information

--version displaying version information

4. Usage examples:

Example 1: View the number of lines, words, and bytes of a file

Command:

WC test.txt

Output:

[email protected] test]# cat Test.txt

Hnlinux

Peida.cnblogs.com

Ubuntu

Ubuntu Linux

Redhat

Redhat

LinuxMint

[Email protected] test]# WC test.txt

7 8 Test.txt

[Email protected] test]# wc-l test.txt

7 Test.txt

[Email protected] test]# wc-c test.txt

Test.txt

[Email protected] test]# wc-w test.txt

8 Test.txt

[Email protected] test]# wc-m test.txt

Test.txt

[Email protected] test]# wc-l test.txt

Test.txt

Description

7 8 Test.txt

Number of Rows Word count bytes file name

Example 2: How to do a WC command to print only statistics do not print file names

Command:

Output:

[Email protected] test]# wc-l test.txt

7 Test.txt

[email protected] test]# cat Test.txt |wc-l

7[[email protected] test]#

Description

Using pipe lines, which is especially useful when writing shell scripts.

Example 3: Used to count the number of files in the current directory

Command:

Ls-l | Wc-l

Output:

[Email protected] test]# CD TEST6

[email protected] test6]# LL

Total 604

---xr--r--1 root mail 302108 11-30 08:39 linklog.log

---xr--r--1 mail users 302108 11-30 08:39 log2012.log

-rw-r--r--1 Mail users 11-30 08:39 log2013.log

-rw-r--r--1 root mail 0 11-30 08:39 log2014.log

-rw-r--r--1 root mail 0 11-30 08:39 log2015.log

-rw-r--r--1 root mail 0 11-30 08:39 log2016.log

-rw-r--r--1 root mail 0 11-30 08:39 log2017.log

[Email protected] test6]# Ls-l | Wc-l

8

[Email protected] test6]#

Description

The number contains the current directory

####################

I used the WC command:

ls | WC:WC are often used in conjunction with pipelines.

Linux Learning Note 26--command WC