Shell

Array manipulation of variables:Reference URL: http://www.jb51.net/article/55253.htm#直接赋值 [[email protected]-Yum Yum. repos.d]# name[0]=Chengd[[email protected]-Yum Yum. repos.d]# name[1]=Xrd[[email protected]-Yum Yum. repos.d]# name[2]=cxx#

This article is intended to accumulate a solution to small problems that are encountered when writing shell scripts at ordinary times. There are occasional updates here for later review and continuation.One, define the default values in the shell

Demand:Text in the first column of the word typeface, and so on, the second column is added, the final output characters and the final and (for the convenience of final check, gave 1)The text is as follows:Cat test.logabc 1aaa 1bbb 1ddd 1sss 1iii

1 Batch Create users:#!/bin/bashI=30Groupadd Class2While [$i-le 50]DoIf ID user$i &>/dev/nullThenecho "This user$i is exist"ElseUseradd-g class2 user$i && echo "User$i" | passwd--stdin user$i &>/dev/null && echo "This user$i is created"Fi((i++))Done2

1. Purpose(1) Shell knowledge Summary. Good memory is better than bad writing, finishing the relevant shell knowledge and combining their own practical experience to organize, the content will not involve all the knowledge points, will only cover

The first is to create the shell daemon: (shouhu.sh)#!/bin/bashtest () {        while true         do                 ls ./  >> 123.txt                 sleep 5                              done}case $1 instart)         path= "/root/shouhu.pid"       

Defining variablesA=Assigning values to variablesA=5' Number equals $ ()[Email protected] ~]# hostnameLocalhost.localdomain[Email protected] ~]# a= ' hostname '[Email protected] ~]# echo $aLocalhost.localdomain${-} to determine whether the variable

The nature of the shell The shell of the Linux system is equivalent to the "one shell" of the operating system, which is the command language interpreter, which provides the user with an interface to use the operating system. It does not belong to

Original blog, reproduced please indicate the sourceThe shell is the command interpreter.See which shells are supported by this system1 Tab Command completionThis almost every time can be used, for example, I have a file called file.txt, assuming

Using SH to write small scripts can make the job easier. Part of the content may be more unfamiliar to everyone (at least I am).is the variable related to the expansion, the following are some simple description and use of the method. To make the

Add 20 users to the CLASS01 group in bulk, the user name begins with STD, ends with a number, format: STD01---STD20Method 1#!/bin/shgroupadd class01a=stdfor ((i=1;iMethod 2:#!/bin/bashgroupadd class01for i in {1..20}doif [$i-lt];thenuseradd "std0$i"-

Brief introductionAwk is a powerful text analysis tool, with the search for grep and the editing of SED, which is especially powerful when it comes to analyzing data and generating reports. To put it simply, awk reads the file line-by-row, using

Today to write blog only to find before there is no written, my God, I was asleep ...1, what is a shell?The shell is a unix/linux system with software that acts as an interface between the kernel and the user, reads the user's input command, sends

Select Use AloneCat select01.sh #!/bin/bashecho "which car do you prefer?" Select CAR in Benz Audi volkswagendo Breakdoneecho "you chose $CAR"Run resultsSH select01.sh which car do you prefer?1) Benz2) Audi3? 1You chose BenzSelect and case are used

########################################################################## File Name:hanoi.sh# Author:free# Mail: [email protected]# Created time:2017 April 18 Tuesday 14:36 43 seconds##################################################################

The first time to write shell scripts, no experience, is to write directly, or to go through the process (￣▽￣) ~*-----------------------------------------------------------------------In general, three steps, let's do it with me.---------------------

Bash is a powerful scripting language, which is the default shell in many Linux occurrences, supports variables and special characters, and looks at what special characters it has:; Command delimiter, you can write multiple commands in one line;;

The head of the Sunset Building, the voice of the hung, Jiangnan wandering. The Wu hook to see, the railing shot all over, no one will, boarding meaning. --Deng Jiankang and Heart PavilionThe hill algorithm is a sort algorithm proposed by Hill

Q1. ArraysWe know that variables are memory space, each variable can only store a single data, a one-time assignment operation, then encountered some need to continuously store and read the task, if you still rely on the variable for multiple

#SIZE 10Direct Insert Sortvoid Insert_sort () {int i,j;int array[size+1];ARRAY[]={0,12,23,11,55,2,34,18,20,48,22};for (i=2;iArray[0]=array[i];J=i-1;while (Array[0]ARRAY[J+1]=ARRAY[J];j--;}ARRAY[J+1]=ARRAY[0];}}Binary Insert Sortvoid