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

#!/bin/bash #Write a script#1. Set the value of the variable file to/etc/passwd#2. Say hello to each user in/etc/passwd and say what the ID is.#shaped like:#Hello,root,your UID is 0. FILE=/etc/passwd COUNT= ' Wc-l${file}| Cut-f1-d" "` forIinch'

There are several commands on the Linux system for file search, such as: Locate,wheris and find are more commonly used in work.1.locate command: Locate the lookup file is based on the/var/lib/mlocate database, which contains all the local file

1. List of files and directories 1.1 more common Linux top-level virtual directory names and their contents: Directory Use / The root directory of the virtual directory. Files are not usually stored here

First, Shell script introduction The 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. The shell is a scripting language; Can use logic

In the shell script, the variable definition, the reference each has the different way, in addition, very commonly has the file attribute judgment, the logical operation, the numerical operation and so on, the following record their attribute

Recently around here for a long time ah, now reluctantly come out, share a little understanding of their ownExit statusA program once run must have only two kinds of results, either success or failure, the result of success is the same, the reason

1, write script/root/bin/systeminfo.sh, display the current host system information, including hostname, IPV4 address, operating system version, kernel version, CPU model, memory size, hard disk size#!/bin/bashecho "hostname: `hostname`"echo "ipv4

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#############################################

Example one: Web server Nginx Script service monitoring[Email protected]/server/scripts] #cat jiance_ng.sh#!/bin/bashif! Ss-lntup|grep [N]ginx &>/dev/nullThen/etc/init.d/nginx startecho "Nginx dead,but It's OK" |mail-s "WHW11" [email

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

What is direct assignment?1. The way the author directly assigns parameter values is called direct assignment.2. In general, an indirect assignment is assigned by an interactive method.Example 1:varl=arppinging.comThis is a direct assignment that is

 Shellscript Common script:ForLoopsWheil Many loops can be replaced with a for loopFor loop syntax structureFor variable name in variable Value listDoinstructionDoneFor ((EXP1;EXP2;EXP3))DoinstructionDoneScript instance:For 99multiplication

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

Write a simple alarm system with the shell Create a directory structure mkdir -p /usr/local/sbin/mon/{bin,conf,shares,mail,log}mon //主目录bin //主程序目录shares //子程序目录mail //发邮件目录log //日志目录Program Main entry

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

#!/bin/bashremote_ip=$1if[!-N" $"] ; Then Echo "Please usage./without_password remote_host!"Exit1Else Echo "The remote_host you input is $remote _ip"fiSSH[Email protected] $remote _IP"mkdir. ssh; chmod. SSH"Ssh-keygen-t RSASCP~/.SSH/id_rsa.pub

1.1 The following table is a logical operatorTips:！ Inverse: A logical value that is opposite to a logical value.-A Chinese meaning is with (&&): Two logical values are true return values are true, and vice versa is false.-O Chinese meaning yes or

1.bash supports one-dimensional arrays (multidimensional arrays are not supported) and does not qualify the size of the array(1) define an array:Array_name= (value0 value1 value2 value3)OrArray_name= (Value0Value1value2Value3)or individually defined: