Basic use of shell WC (counting the number of characters)

wc The function of the command is to count the number of bytes in the specified file 、 Number of words 、 Row number , And display the statistical results .

grammar

Basic grammar ：

wc  [ Options ]   file name 

Meaning of options ：

Example ：

wc1.txt The contents are as follows ：

1 2
34 5
 Hello 

Yes wc1.tx Make statistics , The results are as follows ：

[java@localhost java_demo]$ wc -l wc1.txt 
3 wc1.txt
[java@localhost java_demo]$ wc -m wc1.txt 
12 wc1.txt
[java@localhost java_demo]$ wc -w wc1.txt 
5 wc1.txt
[java@localhost java_demo]$ wc -c wc1.txt 
16 wc1.txt

The newline character at the end of each line is also a character ,1 A space counts 1 Characters .

（1） -l Statistics Row number .
This simple , skip .

（2） -m Statistics Number of characters

1 A Chinese character is used as 1 Character count , The result is 4 + 5 + 3 = 12 .

（3） -w Statistics Number of words .

1 One word is 1 individual word.
The first 1 That's ok ,2 A word ;
The first 2 That's ok ,34 It means a word , common 2 A word ,
The first 3 That's ok , Hello It means a word , therefore ,2+2+1=5.

（4） -c Statistics Number of bytes

use UTF-8 code , A Chinese character is converted here 3 byte ,
The first 1 Line is 4 Bytes ,
The first 2 Line is 5 Bytes ,
The first 3 Line is 7 Bytes ,
The result is 4+5+7=16 .
wc -c The result is 16 .