The text processing of Linux

1 Cut: Split the file in some way and then output

Option:-B Select by byte

-D Custom Delimiter

-F and-D are used together to specify which area or field

[Email protected] ~]# CAT/ETC/PASSWD | Cut-d:-F 1 #以: Prints the first field as a delimiter

[email protected] ~]# Cat B.txt | Cut-b 2-3 #取每行的第2到第3字节

2 Sort: Text sort

Options:-N Sort by value

-R sorted in reverse order

-F Ignore case when sorting

-T Specify delimiter

What interval to sort by-K

[Email protected] ~]# sort Cc.txt #默认从首字符向后依次排序

11

22

22

33

34

5

[Email protected] ~]# sort-n cc.txt #按数值排序

5

11

22

22

33

34

[Email protected] ~]# Sort-rn cc.txt #按降序排列

77

56

56

56

55

34

[Email protected] ~]# CAT/ETC/PASSWD | Sort-t:-K 3-n #以: For delimiters, take third field by value

Root:x:0:0:root:/root:/bin/bash

Bin:x:1:1:bin:/bin:/sbin/nologin

Daemon:x:2:2:daemon:/sbin:/sbin/nologin

Adm:x:3:4:adm:/var/adm:/sbin/nologin

Lp:x:4:7:lp:/var/spool/lpd:/sbin/nologin

Sync:x:5:0:sync:/sbin:/bin/sync

Shutdown:x:6:0:shutdown:/sbin:/sbin/shutdown

3 Uniq: Count or delete duplicate rows

Option:-C count the number of repetitions and print them out

-D displays only duplicate rows

[Email protected] ~]# Uniq-c cc.txt | Sort-rn

3 56

2 22

1 77

1 55

1 5

[Email protected] ~]# uniq-d cc.txt

22

56

4 TR: Character processing

[Email protected] ~]# tr-d "s" < B.txt #删除文件中的s字符

[Email protected] ~]# tr-d ":" </etc/passwd #删除文档中的: No.

[email protected] ~]# Cat B.txt | tr [A-z] [a-z] > aa.txt #把小写替换成大写并且保存为aa. txt file

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The text processing of Linux