Shell

Tag: Date command displays case false cmd put who bar inputShell Exercise: Write a script to do the following: Enter a number, and then run the corresponding command. The command is displayed as follows: *cmd meau** 1--date 2--ls 3--who 4--pwd When

Simple little script, big God DetourImplementation steps:1 Writing scripts2 Doing recurring planning tasks1 scripting[Email protected] ~]# vim tar.shScript content:#!/bin/bash#编写备份脚本, the file name contains a date label after the backup, preventing

Experimental environmentCommand descriptionThe declare and typeset commands are bash's built-in commands (BUILTIN commands), both of which function exactly the same way to set variable values and properties.Typeset is now deprecated and replaced by

Program: Instruction + dataProgram Programming Style:Program: command-centric, data-serving instructionObject type: Data-centric, instruction serves dataShell program: Provides programming capabilities to interpret executionHow to handle the

I. Process Control statements1. If statement①IF Single branch: one condition one resultIf condition then command fi②IF Dual Branch: One condition two resultsIf condition then command Else command 2fi③IF Multi-Branch: Multiple conditions

sudo spctl--master-disable open application from any source when installed;sudo lsof-i:9000;sodu kill-9 pid; View port occupancy and kill process;The Rmic compiler generates stub classes and skeleton classes;/home Install software Boot of the

File expression-e filename true if filename exists-d filename If filename is a directory, true-F filename True if filename is a regular file-L filename True if filename is a symbolic link-r filename If filename is readable, true-W filename if

2017 the latest enterprise face Test shell (i)**********************************************Enterprise Shell face question 1: Batch generate random character file name case ***********************************************Use the For loop to bulk

Vmware Tools works with shell scripts to automatically shut down the ESXI6.0 processPrerequisites: Each virtual server in the ESXi host needs to install the VMware Tools tool and use it with the script, otherwise it will not be able to shut down

Using http://www.weiruoyu.cn/?p=368Shell script monitors hard disk space remaining space email alerts1. First look at the disk, and how to use the script [[email protected] ~]# df -h File System                 capacity    used  

#!/bin/bash############################################## #Author: Liuzhengwei-[email protected] #QQ: 1135960569# Last modified:2017-08-16 16:05#filename:nginx_logrotate.sh#description:######################################### # # # # #back_dir

Requirements: List which commands are most used and enter them into Chy1.txtIdea: Our command is all there is a history file/root/.bash_history This file, you need to sort the commands used

A. For statement1. Use the For statement to add users in bulk650) this.width=650; "src=" http://s3.sinaimg.cn/bmiddle/006OWCmEzy7cGLCj6ued2&690 "Name=" Image_operate_ 75451500196244212 "alt=" shell script some basic statements of the use of "title="

Getting Started with Shell scripting--NextThis article introduces the following: Logical operators (&, | 、!、 ^), test commands, script execution procedures1. Logical operators(1) & and && short circuit andTrue, False1 0And:1 & 1 = 11 & 0 = 00 & 1 = 0

The following is a script for the installation and modification of nginx.conf scripts written by the shell script, which is relatively simple:#!/bin/bashfunction Yum_install () {Yum Install Epel-release-yYum Install

1.bcCommon calculation Tools , and supports floating-point arithmetic:[Email protected] shell]# echo | Bc2floating point number accuracy problem not resolved[Email protected] shell]# echo "1.2*1.2" | Bc1.4[Email protected] shell]# echo "scale=2;1.2

I. Brief INTRODUCTION 1. What is a shellThe shell is a program written in C that is a bridge for users to use Linux.The shell is a command language and a programming language.The shell can also refer to an application that provides an interface that

Command editing ability (history):One of the great features of Bash is that "he can remember the commands he used!""This is a really great feature!" Because I just have to press the "up and Down" button in the command line to find the front/rear

The shell script in Crontab writes the top information to the file:Note:1, Top-n 1 for Execution 1 exit (default top is not exited),-D 1 for 1 seconds2, crontab need to add/bin/bash# CRONTAB-E*/5 * * * */bin/bash/usr/local/bin/top.sh# VI

Is the shell script used to determine whether the strings are equal? (Code instance), shell scriptShell script to determine whether the strings are equal Basic Elements 1) Declaration of variables 2) Use of if Statements 3) Use of echo 2. The