Shell special symbol, cut command, sort_wc_uniq command, tee_tr_split command, Shell special symbol

Shell Special Symbols

* Any of any characters

[[email protected] ~]# ls *.txt

1.txt 23.txt 2.txt David.txt

? Any one character

[email protected] ~]# ls?. Txt

1.txt 2.txt

# comment Characters

[[email protected] ~]# #echo ' OK '

\ de-Semantic characters

[Email protected] ~]# echo-e ' 123\n456\n789\t0000 '

123

55W

7890000

| Pipe character

[email protected] ~]# cat 2.txt|wc-l

2

Cut command

-b Specifies the number of bytes

-D delimiter

-F Specify segment number

-c Specifies the number of characters, if the Chinese character equals 3 bytes c=3b; English c=b

[email protected] ~]# cat 2.txt

I am Linux my QQ 1234567

[email protected] ~]# cat 2.txt|cut-b 1,2,3,4

I am

[email protected] ~]# cat 2.txt|cut-c 1,2,3,4

I am

The difference between Chinese and English

[email protected] ~]# cat 1.txt

I'm a Linux

[email protected] ~]# Cat 1.txt|cut-c 1

I

[email protected] ~]# cat 1.txt|cut-b

I

Example 2: Print out Linux my

[email protected] ~]# cat 2.txt

I am Linux my QQ 1234567

[email protected] ~]# cat 2.txt|cut-d "-f 3,4

Linux my

Sort_wc_uniq command

-N Sort Ascending by numeric value

-R Reverse

-U excludes duplicate rows

[Email protected] ~]# sort-n 2.txt

0

0

0

1

1

2

2

3

4

45

56

56

66

87

687

-R: Reverse

[Email protected] ~]# sort-r 2.txt

87

66

56

56

45

4

Go weight:

[Email protected] ~]# Sort-un 2.txt

0

1

2

3

4

45

56

66

87

-T is represented by: is a delimiter;-k3 is sorted by 3rd paragraph

[Email protected] ~]# sort-n-T:-k3 3.txt

pear:90:2.3

apple:10:2.5

orange:20:3.4

banana:30:5.5

Wc-l number of statistics file lines

Wc-c Statistic character Count

Wc-w statistics of words

Uniq

Uniq-d: Show only recurring rows

Uniq-u: Show rows that do not recur

UNIQ-C: Number of calculations

[email protected] ~]# cat Test.log

Https://www.taobao.com/1.html

Https://www.taobao.com/2.html

Https://www.taobao.com/3.html

Https://www.taobao.com/2.html

Https://www.baidu.com/inyydex.html

Https://www.baidu.com/in.html

Https://www.baidu.com/index.html

Https://jusjuu.ia/jsw/zdnst/index.html

[[email protected] ~]# awk-f ' [:/]+ ' {print $} ' Test.log |uniq

Www.taobao.com

Www.baidu.com

Jusjuu.ia

[[email protected] ~]# awk-f ' [:/]+ ' {print $} ' Test.log |uniq-c

4 www.taobao.com

3 www.baidu.com

1 Jusjuu.ia

[[email protected] ~]# awk-f ' [:/]+ ' {print $} ' Test.log |uniq-d

Www.taobao.com

Www.baidu.com

Tee_tr_split command

Tree

Tee and > similar, redirect while still on screen display

Tr

Replace character

[Email protected] ~]# echo "HELLO World" | Tr ' A-Z ' A-Z

-D: Delete

[[email protected] ~]# echo "HELLO 123 WORLD12 12" | tr-d [0-9]

HELLO World

[Email protected] ~]# echo "hello:123 world:12" | Tr-s ":" "="

Hello=123 world=12

Split

Cutting

-B Size (default unit byte)

-L Number of rows

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Shell special symbol, cut command, sort_wc_uniq command, tee_tr_split command, Shell special symbol