Shell

Process Control StatementsIn the shell if multiple commands are entered in the terminal, the commands are placed in the background if they are separated by &, and a collection of commands is represented if delimited. Shell allows logical operators

This is I learn to make notes or to make notes on their own easy to remember the format is very important examples are reference I also made the color on the impression notes to distinguish it on the top of it. read for interactive scenarios

One, pipe and operation controlPipe character |: To pass the output of a file to the following commandgrep: A command used to filter a specified keywordApplication Examples:[[email protected] ~]# ls |wc-l//list How many rows are in the current

Shell Introduction The shell is a command interpreter that provides interaction between the user and the machine Supports specific syntax, such as logical judgment, looping Each user can have their own specific shell CentOS7

Format 1:if condition; Then statement; FiFormat 2:if condition; Then statement; else statement; FiFormat 3:if ...; Then ...; Elif ...; Then ...; else ...; FiLogical judgment expression: if [$a-gt $b]; If [$a-lt 5]; If [$b-eq 10] et-gt (>); -lt (=); -

I. Logical judgment in shell Scripts 1, Judgment statement IFA) without elseFormat:if 判断语句；then commandfiInstance:[[email protected] shell]# vim if01.sh //判断数值大小第一种方法用[]，注意前后空格#! /bin/basha=5if [ $a -gt 3 ];then echo

1. Exit status of the command (1), (Kw:exit status)Each command has an exit state, represented by a non-negative integerStatus code 0 indicates that the command is running without errorsNon-0 Status code indicates a command errorThe range of status

To master a language, you must first master its grammar. As in C, the shell has its own syntax.VariableAs a rule, shell variables usually begin with an underscore, consisting of letters, numbers, and underscores of any length. There are two types of

Operating system: CentOS 7.2SendMail Automatic Alarm#完成时间: 2018.04.16#!/bin/bash#CPU 1,5,15###########################################################If [-e Detection_script]ThenMkdir-p/detection_script/Fi#############################################

1.shell script gets the native IP address:localhostip= ' lc_all=c ifconfig 'inet addr:'127.0.0.1' | '{print $}'"$localhostIP"2. Automate the setup of an IPSec test environment:#!/bin/Bash#sudo Suecho"Get root! "apt-get Install Strongswan-

Tag: Class begins with regular expression find parenthesis expression matches between awkRegular expressions and wildcard characters:1. The regular expression is used to match the qualifying string in the file , and the Regex contains the match .

There are three main steps to completing tasks and monitoring manually:1. mission_cron.php (timed automatic task script):2. Mission_cron_monitor (run by crontab, monitor the above script):#/bin/bash# Monitor the timer and disconnect the reboot. # #

First, the expression of the blockBecause the shell can not define a two-dimensional array, so can only use one-dimensional array to represent the box, Tetris can be divided into 7 categories, each type of block is composed of four types of small

Preface: Before we get to the point, let's review the conditional tests on scriptingOne, Process Control Over-programming languagesA. Sequential executionB. Select executionC. Cyclic execution Sequential executionAs the name implies, it is

One: function classification Local function (local variable)local variable name. modifications to variables in the local function are only valid during the current function run. Func1 () {local Name=test;echo "func1:name= $name"; local

Shell Scripting Learning RecordWhy learn shell scripts?In some complex Linux maintenance work process, a large number of repetitive input and interactive operation is not only time-consuming and difficult, and error-prone, however, writing shell

cat raid_fzt.sh#!/bin/bash#data:2018.3.9#check raid status and mail to  Someonedir= "/home/s/ops/pantheon/argos/raid.check"   #  script directory cd  $DIRLOG = ' raid_ Check.2018-03-09_11:17:31 ' #LOG =$ (ls -t raid_check. ' date + "%F" '. * | xargs 

1.1 How to use a file to test an expressionWhen we need to process an object in programming, we need to test the object and only take action to meet the requirements. The benefit of this is to avoid program errors and to consume system resources

23. Shell Introduction, Command history, command completion and aliases, wildcard characters, input and output redirectionFirst, Shell introductionThe shell is the intermediate medium that the system interacts with the computer hardware, it is just

The company project used Springboot. Applications that are developed need to be automatically uploaded to the server. Although the current thermal deployment is not fully mastered. First use the shell to simplify deployment.# upload Key Sshloginkey=/