Shell

install MAILX, rely on it to send mailyum install mailxEditing a configuration filevim /etc/mail.rc #添加如下内容set [email protected]set smtp=smtp.163.comset [email protected]set smtp-auth-password=xxxset

The case selection statement in the shell script can be combined with the read instruction to achieve a good interactive response operation, case receives one or more parameters passed in by the read instruction, and then the case is selected

Case statementcase $变量名 in "值1"） ? 如果变量的值等于值1,则执行程序1 ;; ?"值2"） ? 如果变量的值等于值2,则执行程序2 ;; ? ...省略其他分支... ? *) ? 如果变量的值都不是以上的值,则执行此程序 ;;esac ?//case反过来写"case语句的使用实例"#!/bin/bashread "please input yes /no": chocase "$cho" in "yes") ? ? echo "输入正确！";; ?"no"

VariableA variable is a named memory spaceAll variables in the shell are treated as character variables by default, and bash does not support floating-point variablesNaming rules for variables:You cannot make a reserved word in a program: for

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. # #

Case one:Monitoring Web Site Directory ( /var/html/www ) If all files are tampered with (the contents of the file have been changed), if there is a file name (e-mail) to print the changes, the scheduled task every 3 minutes to execute onceMonitoring

The issue cannot be removed after using HBase shell entry in Xshell:In the HBase shell, the wrong input instructions can not be deleted using backspace and delete, the use of the people know that this is a lot of pits, there is much distress!OK,

Shell: is an outer layer of the kernel Protection tool, and is responsible for the completion of user-to-kernel interaction;Provides an interface for users to interact with the kernel, which receives commands entered by the user and sends it to the

Chapter 1th whileLooping Statementsin a programming language , a while loop is a statement of a control flow that uses an expression that returns a Boolean value that, when the return value of the expression is true , repeats the condition of the

One, the shell quotes1. "", double quotation marks (do not retain the full content, such as encountered $, anti-quotes, \ etc will execute the corresponding shell)echo "Today is `date`" -> Today is Wed Aug 2. Single quotation mark (full retention

Logical operations in shell programming, with or without, short-circuit operations, XOR operations, we use the simplest way to understand the XOR.XOR: ^XOR two values, same as false, different for trueUnderstandably, two values refer to binary

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

Before using shell to write scripts, sometimes not only to define a configuration file, often have a template, different environments directly replace the same template content to use, however, until then, has been used in the SED, awk, grep and so

1.1 If statement(1) If conditional statement syntax: Single branch structureif [condition]ThenInstructionsFiOrif [Condition];thenInstructionsFiIf single branch condition Chinese programming Image grammarIf [you have a room]SoI'll marry you.Fruit

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

Backs up all modified files in the current directory within the last 24 hours in a "tarball" (Files that have been processed by tar and gzip).The program code is as follows:#!/bin/bashBACKUPFILE=backup-$(date +%y-%m-%d)#

#!/bin/bashif [$]thenbackup_level=$1elsebackup_level=0fibackup_user=sysbackup_user_pw=oracle#catalog_user=rman #catalog_user_pw =rmanlog_file=/oracle/admin/$ORACLE _sid/rman_backup.logecho "Beginning rman backup ..." > $log _ filedata>> $log

There is the following text, where the first 5 lines of content are1,111,111:13,443,253,4562,222,222:13,211,222,1221,111,111:13,643,543,5443,333,333:12,341,243,1232,222,222:12,123,123,123After processing with the shell script, output in the

Mass production of random character filenamesRequirement: Use the For loop to create 10 batches of HTML in the/oldboy directory. Each of these files needs to contain 10 random lowercase letters plus a fixed string of Oldboy.#!/bin/bash[!-d/oldboy] &&

Sometimes in some service management scripts to see the $ "$string", after some tests, found that the outside of the quotation marks is the same as No. Just turned the man bash and found an explanation.(1). If there is no special custom bash