Shell Special Symbol/cut,sort,wc,uniq,tee,tr,split command

Shell Special Symbol Cut command

Shell Special Symbols

* *任意个任意字符* ？任意一个字符* #注释字符* \脱义字符* |管道符

Command cut
cut is used to intercept a field in the form of: #cut –d ' separator character ' [-cf]n,n is a number.

Options:
- D is followed by a delimiter, and delimited characters are enclosed in single quotes.
- c is followed by the number of characters.
The number of blocks is followed by- F .

[Email protected] ~]# cat/etc/passwd |head-2
Root:x:0:0:root:/root:/bin/bash
Bin:x:1:1:bin:/bin:/sbin/nologin
[[email protected] ~]# cat/etc/passwd |head-2 |cut-d ":"-F 1
Root
Bin
[Email protected] ~]# cat/etc/passwd |head-2 |cut-d ":"-F
Root:x
Bin:x
[[email protected] ~]# cat/etc/passwd |head-2 |cut-d ":"-F 1-3
root:x:0
Bin:x:1
[Email protected] ~]# cat/etc/passwd |head-2 |cut-c 4
T

Sort_wc_uniq command

Sort command
sort is used for sorting, in the format sort[-t delimiter][-kn1,n2][-nru], where N1 and N2 refer to numbers, and other options have the following meanings.

Options:
- n means sorting with pure numbers
- R indicates reverse ordering
- u means to repeat
-T followed by a split character, as with the-D option of cut
The -kn1,n2 indicates that the N1 interval is sorted to the N2 interval and can be written only-kn1, that is, the N1 field is sorted

[[Email protected] Document]# sort 1.txt
<
>
[
1111
11222
22333
444444411
Adm:x:3:4:adm:/var/adm:/sbin/nologin
[[Email protected] Document]# Sort-n 1.txt//letter defaults to 0
<
>
[
Adm:x:3:4:adm:/var/adm:/sbin/nologin
1111
11222
22333
444444411
[[Email protected] Document]# SORT-NR 1.txt//reverse order Display
444444411
22333
11222
1111
Adm:x:3:4:adm:/var/adm:/sbin/nologin
[
>
<

WC command

The WC command is used to count the number of lines, characters, or words of a document. The common options for this command are:
- L(count rows)
- M (Number of statistics characters)
- W(number of statistical words)

[[Email protected] Document]# cat 2.txt
Hello World
111
222
111,222
[Email protected] document]# wc-l 2.txt
4 2.txt
[Email protected] document]# wc-m 2.txt
2.txt
[Email protected] document]# wc-w 2.txt
5 2.txt

Uniq command
uniq used to delete duplicate rows
Options:
- C Count repeats

[[Email protected] Document]# cat 2.txt
Hello World
111
222
111,22
222
Aa
345
222
Aa
456
456
[[Email protected] Document]# sort 2.txt |uniq-c
1 111
1 111,22
3 222
1 345
2 456
2 AA
1 Hello World

Tee_tr_split command

Command Tee
Tee followed by the file name, its role is similar to redirect, the specific gravity of a function, the file is written to the following file and displayed on the screen, usually used for pipe characters | After.
Options
-a added meaning

[[Email protected] Document]# sort 2.txt |uniq-c |tee 4.txt
1 111
1 111,22
3 222
1 345
2 456
2 AA
1 Hello World
[[Email protected] Document]# sort 2.txt |uniq-c |tee-a 4.txt
[[Email protected] Document]# cat 4.txt
1 111
1 111,22
3 222
1 345
2 456
2 AA
1 Hello World
1 111
1 111,22
3 222
1 345
2 456
2 AA
1 Hello World

Command TR
TR for substitution characters

[[Email protected] Document]# echo "Asklinux" |tr ' [al] ' [Al] '
Asklinux
[[Email protected] Document]# echo "Asklinux" |tr ' [A-z] ' [A-z] '
Asklinux

Command split

Split is used to cut documents.

Options:
- b means that the document is split by size in bytes
- L to divide the document by the number of rows

[[Email protected] Demo]# du-sh 5.txt
652K 5.txt
[[Email protected] Demo]# split-b 200k 5.txt
[[Email protected] Demo]# ls
5.txt Xaa xab xac xad
[[Email protected] Demo]# split-l 4000 5.txt
[[Email protected] Demo]# ls
5.txt xaa xab xac xad xae

Shell special symbol under

* $变量前缀，!$组合，正则里面表示行尾* ；多条命令写到一行，用分号分割* ~用户家目录，正则表达式表示匹配符* &放到命令后面，会把命令丢到后台* >  >>   2>  2>>  &>* []指定字符串中的一个，[0-9],[a-zA-Z][abc] * ||和&&，用于命令之间

[[Email protected] Demo]# rm-f xa*; LS//SEMICOLON usage
5.txt

[[Email protected] document]# ls 1.txt | | Wc-l 2.txt//When the previous command is executed correctly, the following command will no longer execute
1.txt
[[Email protected] document]# ls 1.txt && wc-l 2.txt//When the previous command is executed correctly, the following command executes
1.txt
2.txt

Shell Special Symbol/cut,sort,wc,uniq,tee,tr,split command