Shell

Site was DDoS attack, so wrote a foot to resist, to achieve the way: 1. Attack characteristics, different IP constantly post Web page, resulting in excessive resource consumption2. Analyze Nginx Access log, Judge post feature to obtain Client

In order to more easily know the memory usage on the server, and according to the memory use size to restart the service, I only the whole fault alarm, if you want to automatically restart the service, we will have to modify their own. Script

Principle: awk command, split formatted TXT (TXT file format with "|") divided) into groups, then spliced into HTML format (html-head-title-body-table) Shell Source #!/bin/sh file_input= ' txt.log ' file_output= ' txt2html.html ' td_str= '

> and when it comes to I/O redirection, let's get to know file descriptor (FD) first. The operation of the program, in most cases, is the processing of data (data), which is read from where? And where to send it? This is the function of file

If you manage more sites and servers, every time you modify a configuration file, it's pretty painful. The idea is to use a shell script to generate bulk configuration files and configuration data. The following script is a shell script for batch

Previously used Ubuntu, the installation of uninstall software is basically using apt-get this very simple, and the process of software dependencies will automatically help us deal with, similar to the fool-like installation. In addition, in the

The Linux shell can be user-defined, and can be invoked randomly in a shell script. Here's how it's defined, and what the call needs to pay attention to. First, define the shell function (define functions) Grammar: [Function] funname [()]

1, login to the host and enter ssh-keygen-t RSA Prompt for enter file in which to save the key (/ROOT/.SSH/ID_RSA): Input/root/.ssh/sea_rsa Enter the relevant pathname and filename as prompted and generate two files (followed by two options to

First, Shell introduction The design of many Unix-like operating systems is stunning. Even today, the UNIX-style operating system architecture remains one of the best designs ever. One of the most important features of this architecture is the

Method 1: Add a variable to an integer value by using expr, or an integer if it is performed correctly, or an error is executed, $? will be a value that is non 0 Copy Code code as follows: Expr $args + 0 &>/dev/null Method 2

#/usr/bin/env Bash # Name:get_network_info.sh # author:purple_grape # This was a script to gather network inf Ormation of your Linux system. # Test under Ubuntu 10.04 only. #---------------------------- nic=eth0 mac= ' lang=c ifconfig $NIC | awk '/

BASH shell set font and background color Echo-e "\e[31mtest\e[41m" \e[30m change the display color of a character to black \e[31m change the display color of a character to red \e[32m change the display color of a character to green \e[33m change

1. Take today's time Copy Code code as follows: $date-D "Now" +%y-%m-%d 2. Take yesterday time Copy Code code as follows: $date-D "Yesterday" +%y-%m-%d $date-D "1 days ago" +%y-%m-%d # # D,--date=string

Many people use shell scripts to accomplish simple tasks and become part of their lives. Unfortunately, shell scripts can have a very large impact when they run an exception. It is necessary to minimize this type of problem when writing scripts. In

Each language has his own string manipulation method, the shell is the same, the following in an example of the way, a simple introduction of common methods. 1, get string length Copy Code code as follows:

1shell is an interface between the user and the kernel to interoperate, 2shell commands that can be run include Linux commands, built-in commands, utilities, user programs, shell scripts 3shell characters: 4. Get command help: Man,info.--help 5

Scene:The Redis keys value needs to be monitored, and monitoring scripts are executed using the Crond cycle. If there is an exception, notify by email.First, install the MSMTPDownload softwarewget http://sourceforge.net/projects/msmtp/files/msmtp/1.4

5. Bash 's operators5.1 numeric operations and operators5.1.1 Declare declaring variable types: #declare [+/-] [ option] Variable name Options Description - set type properties for variable

The shell itself is a program written in C, which is a bridge for users to use Unix/linux, and most of their work is done through the shell. The shell is both a command language and a programming language. As a command language, it interprets and

[Email protected] ~]#CatJiechen.SH #!/bin/bash# Design a shell program to calculate the factorial of N, required: #1. Receive parameters from the command line n;#2to determine the legality of n immediately after the commencement of the program, that