Shell

SedSED: it is called a streaming editor, and its working scenario is typically in the editor, where a piece of text is read in the SED in a row and then output in the specified way, which is its most basic usage.First, the basic operation of

Little brother just contact Linux, a lot of things on Linux is more unfamiliar, so write a blog, as their work summary and technology accumulation bar, but also spur their efforts to learn.The reason for today's title is to put Export,source, Bash's

First, using the shell script to implement the progress bar#!/bin/bashfunction proc ()   4 {  5     count=0   6     bar= ""   7     lable= ("|"   "/"   "-"   "\")   8     while [  $count  -le  100 ]  9     do 10              let index=count%4 11     

Topic 1:1-100 summationNon-recursive version:#!/bin/bashsum=0while [$val-le]dolet sum+=vallet val++doneecho $sumsum =0for i in {1..100}doif [$i = = 1]; Thenbar=${bar}${i}elsebar=${bar}+${i}filet Sum+=idoneecho $bar = $sumsum =0for ((i=1; iOperation

#需求Original content 10.221.29.30 modified: qq1-5f ansible_ssh_host=10.221.29.30Original content 10.225.32.75 modified: qq6-10f ansible_ssh_host=10.225.32.75Original content 10.221.249.127 modified: qq11-15f ansible_ssh_host=10.221.249.127#文件展示[Email

1, 1-100 number summation① non-recursive methodShell650) this.width=650; "src=" Http://s1.51cto.com/wyfs02/M02/83/0B/wKiom1dpIcHBcRrUAABevxRp8l8674.jpg "title=" Sum1.jpg "style=" Float:none; "alt=" wkiom1dpichbcrruaabevxrp8l8674.jpg "/>Operation

Read command: Primarily used in the shell to read input, variables, text1. accept input from the standard input (keyboard) and assign the input data to the SET variable"Press Enter--indicates that the input is complete""If more data is entered than

An efficient development environment is undoubtedly of great help to our daily work, and time is saved by these tiny details.Next, I'll show you how to configure ZSH+INCR to create the ultimate and efficient development environment.First, let's look

In shell scripts, all of our variables are stored as strings. So it becomes very important for the interception of strings.In a shell script, if you want to specify a string for interception, there are several ways to do it:The following examples

#!/bin/bashwhile read Linedo for file in/home/local/test/* does if test-f $file then sed-n "/${line }/p "$file >>/home/local/out.txt fi Donedone Task: To file from the Home/local/test folder belowFile_1.logFile_2

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Linux There are eight ways to intercept a string. Suppose there is a variable var=http://www.aaa.com/123.htm.1. # Intercept, delete the left character, leave the right character. The code is as follows:Echo ${var#*//}where var is the variable name

several termsMute terminal (dumb terminal):A dumb terminal was usually nothing more thanA monitor and keyboard connected to the Unix system via a communication cable (usually a multiwireSerial cable multi-line serial cable, also called ribbon cable).

expression format for conditional judgments:File Judging type:[[Email protected] ~]# [-E/ROOT/1] && echo yes | | echo no #注意 [] inside the space, the first command is true print Yes, otherwise print noyes[[email protected] ~]# [-F/ROOT/1] && echo

Create loops in shell scripts to append echo content redirection to a file650) this.width=650; "Src=" Http://s1.51cto.com/wyfs02/M01/82/E7/wKioL1dj6XHwzJ-tAAAoItNjmwc457.png-wh_500x0-wm_3 -wmp_4-s_2295541797.png "title=" qq picture

The summation of 1...100Non-recursive:   #!/bin/bash read num count=1 sum=0 val= ""  ret= ""  while  [  $count  -le  $num  ] do    if [  $count  -eq   $num  ];then        val= $count     else         val=${count} ' + '     fi   

Three ways:1.While Read lineDoDone2.For line in ' cat filename 'DoDone3.Cat FileName | While Read lineDoDoneCases:Reads data from the Math_file file, outputs the maximum, minimum, and average values1.650) this.width=650; "src="

1 #!/bin/bash23 str= "Http://www.baidu.com/test.htm"45 #echo ${str}The result of the operation is:http://www.baidu.com/test.htmMethod One: #截取, delete the left character, leave the right characterEcho ${str#*//}#*//means to delete the first//number

---restore content starts---Primary stage:--File operation:--Document as a whole: increase, delete, copy, move;--File content: Append, overwrite, empty;--Regular expression:--String:--interception, splicing;echo "ABCD" > ShellTest.log: Writes "ABCD"

First question: Recursion and non-recursion of Fibonacci sequencesNon-recursive:650) this.width=650; "Src=" Http://s1.51cto.com/wyfs02/M00/82/EF/wKiom1dl-8rD92igAAB-pImrC88891.png-wh_500x0-wm_3 -wmp_4-s_582408408.png "title=" series non-recursive