Shell

Process Control is the instruction that alters the order of the program's operation.4.1 If statement4.1.1 Single Branchan If condition expression; Then command fiExample:#!/bin/bashn=10if [$N-gt 5]; then echo yesfi# bash Test.shyes4.1.2 Dual

1, test-f file 2, [-F file] 3, [[-F file]][-F file1-a-F file2] logic with [-f file1-o-F file2] logic or [-f file1] && [-f file2] the same as a string operation best double quotes such as-n-z = = = And a space is added to both sides of the equals

#!/bin/ bash#JW = (' Wang Hao ' ' Shei Yunsheng ' ke Yang ' He Shingyu ' Repeti soldier ' Dengbellin ' Liu Dao ' ' Yang Jidong ', ' Chu Ziwen ', ' "' Yang Dong '" Huang Tinghui ' ' "," "The" "The" "The" "The" "The" "The" "The" "the" ' Zheng

Enter HBase command line./hbase ShellShow tables in HBaseListCreate a user table with info, data two column familiesCreate ' users ', ' info ', ' data 'You can also use the This command:Create ' users ', {NAME = ' info ', VERSIONS = ' 3 '}Insert

Shell TutorialsThe shell is a program written in C that is a bridge for users to use Linux. The shell is both a command language and a programming language.A Shell is an application that provides an interface through which users access the service

#! /usr/bin/expectip_array = $ (cat /tmp/ip.txt) username = rootfor ip  in ${ip_array[*]} {                 ##### #IPspawn  ssh -p 6122 [email protected]$ $ipexpect  {"(yes/ NO)? "  { send  "yes\r";  exp_continue } "Password:"  { send  "[email 

Sometimes it is necessary to start the project automatically after the start of the CentOS system, when the project is deployed in Tomcat, if the CentOS shutdown after the boot, the project has been stopped, and then need to be a manual to open each

Write a script, create a folder, enter a folder, and then use the loop to create a sequential file in the folderIdea: 1. Create the specified folder and go to the folder2. Specify a variable with a value of 0 to allow this variable to be recycled3.

In the production environment log is the operation and maintenance personnel to understand and analyze the production environment first-hand information, but the content of the log information is quite large, especially in the public cloud

Getting started with Linux shell scripts--cut commandCutThe Cut command extracts text columns from a text file or text stream.Cut grammar[[email protected] ~]# Cut- D " Delimited character " -F fields for having a specific delimiter character [[

Log-in Shell:Su–usernameSu-l usernameNon-logon Shell:SU usernameOpen Command Window under graphics terminalShell scripts that are executed automaticallyBash's configuration fileGlobal

1.HELP displays a list of all built-in commands, or the use of a built-in command #help//View all built-in commands #help built-in commands//view built-in command usage #help-S built-in command//display the syntax format of the

First, prefaceAs is known to all, Jenkins can implement project updates by default (via SVN, but our company uses git), and projects are released through (Maven plugin), but in this case under some containers (such as Tomcat), The JVM will report

First, prefaceAs is known to all, Jenkins can implement project updates by default (via SVN, but our company uses git), and projects are released through (Maven plugin), but in this case under some containers (such as Tomcat), The JVM will report

#!/bin/bash######################################################## Name:shell_exp.sh# version:v21.0# function:backup MySQL Databases Template Script# Author:zz# Create Date:2016-12-03# Description:study###############################################

You must enclose all the file names you get into the array, or the for loop will be parsed as a wildcard, or you can use a shell dictionary, as well as quotation marks.Shell Dictionary Example#!/bin/BashEcho "Shell Definition

#!/bin/Bashwhoami=' WhoAmI 'if[$#-lt"1"] then echo'[program name] [Action Object]'Exit0fi# requires two parameters, parameter one: start line, parameter two: End line, parameter three: Operation Object function seddata{ forNumxinch' IPCS | Sed-n ${1}

#!/bin/bash#2.sh# Write a shell script to get the network address of this machine. #比如: The IP address of this machine is: 192.168.100.2/255.255.255.0, then its network address is 192.168.100.1/255.255.255.0# Note: Bcast with the previous IP address

#!/bin/Bash#defind the Pathpath=/usr/Localexport Pathread-P"Please input your first name:"Firstnamereap-P"Please input your last name:"LastNameEcho-E"\nyour name is: $firstname $lastname"#useDateCreatefileRead-P"Please input your

Today in the shell script to write Fibonacci sequence calculation, has been constantly error, the main reason is because the shell script is too intelligent, in the array operation need to write a lot of symbols, it is easy to confuse, so a little