Shell special symbols, cut_sort_wc_uniq commands, and Tee_tr_split commands

Shell Special Symbols

• * Any of any characters

• ？ Any one character

• # comment Characters

• \ de-Semantic characters

• | Pipe character

• $ variable prefix,!$ combination, regular inside means end of line

• ; Multiple commands written to one line, separated by semicolons

• ~ User home directory, followed by regular expression to indicate match

• & put the command behind the command and throw it backstage.

• > >> 2> 2>> &>

• [] One of the specified characters, [0-9],[A-ZA-Z],[ABC]

• || And &&, used between commands

Cut_sort_wc_uniq command

Cut Delimited

Options

-D delimiter

-F Specify segment number

[Email protected] ~]# cat/etc/passwd |head-2 |cut-d ":"-f 1rootbin[[email protected] ~]# cat/etc/passwd |head-2 |CU T-d ":"-f 1,2root:xbin:x[[email protected] ~]# cat/etc/passwd |head-2 |cut-d ":"-F 1-3root:x:0bin:x:1

-c Specifies the number of characters

[Email protected] ~]# cat/etc/passwd |head-2root:x:0:0:root:/root:/bin/bashbin:x:1:1:bin:/bin:/sbin/nologin[[ Email protected] ~]# cat/etc/passwd |head-2 |cut-c 4t:

Sort sorts

Instance:

650) this.width=650; "Src=" Https://s2.51cto.com/oss/201711/18/dbfc28568903c4c798a6ee774b83059d.png-wh_500x0-wm_3 -wmp_4-s_3849777129.png "title=" Qq20171116232935.png "alt=" Dbfc28568903c4c798a6ee774b83059d.png-wh_ "/>

Options

-N Sorts by numbers: letters and special symbols are labeled 0

-R Reverse Order

-T delimiter-kn1/-kn1,n2

Wc

Options

-L count rows

[[email protected] a]# cat 1.txt |head-1root:x:0:0:root:/root:/bin/bash[[email protected] a]# cat 1.txt |head-1 |WC-L1

-M statistic character number

[[email protected] a]# cat 1.txt |head-1 |wc-m32[[email protected] a]# cat 1.txt |head-1 |cat-aroot:x:0:0:root:/root:/ bin/bash$

-W statistic: delimiter as a white-space character

[[email protected] a]# echo ' aaa bbb,wwww 222211$a ' |WC-W3

Uniq to repeat

# Uniq 1.txt need to sort and then go back to Weight # sort 1.txt |uniq[[email protected] a]# echo ' 2222> 1111> 2222> 1111> 1bx> 2bx>  1bx ' |sort |uniq11111bx22222bx# uniq-c count rows//sort 1.txt |uniq-c[[email protected] a]# echo ' 2221112221BX2BX1BX ' |sort |uniq-c 1 111 2 1bx 2 222 1 2BX

Tee_tr_split command

Tee and > similar, redirect at the same time also on the screen display-A//Append

[Email protected] a]# echo ' 2222 ' |tee 2.txt2222[[email protected] a]# cat 2.txt2222[[email protected] a]# echo ' 2222 ' |te E-a 2.txt2222[[email protected] a]# cat 2.txt22222222

TR replacement character, tr ' a ' B ', case replacement TR ' [A-z] ' [A-z] '

[[email protected] a]# echo ' A ' |tr ' a ' a ' a

Split Cut,-B size (default unit byte),-L line number

[[email protected] a]# du-sh 1.txt4.0k1.txt[[email protected] a]# split-b 1.txt[[email protected] a]# ls1.txt XAA Xab xac xad xae[[email protected] a]# du-sh24k. [[email protected] a]# ls-l total usage 24-rw-r--r--. 1 root root 461 November 10:34 1.txt-rw-r--r--. 1 root root 100 November 11:45 xaa-rw-r--r--. 1 root root 100 November 11:45 xab-rw-r--r--. 1 root root 100 November 11:45 xac-rw-r--r--. 1 root root 100 November 11:45 xad

This article is from the "Travels of Taoyuan" blog, please make sure to keep this source http://3622288.blog.51cto.com/9153892/1982951

Shell Special symbols, cut_sort_wc_uniq commands, and Tee_tr_split commands