how to write bash script

replace the variable with the variable value. To prevent this type of replacement, you can use quotation marks: Let's take a look at an example. suppose there are some files in the current directory, two jpg files, mail.jpg and tux.jpg. #! /Bin/sh Echo *. jpg This will print the result of "mail.jpg tux.jpg. Quotation marks (single quotation marks and double quotation marks) will prevent such wildcard extension: #! /Bin/sh Echo "*. jpg" Echo '*. jpg' This will print "*. jpg" twice. Single quote

This time, the simplest form of the script will be implemented. The script has only commands, labels, and jumps, and it looks like a compilation, but it's good to read. Although the syntax of this scripting language is very simple, the most basic elements are still available. As a scripting engine, the script itself is best not to involve specific areas in order

Vim mytar.sh#!/bin/bash#read-p "Three files:" File1 file2 file3read-p "Destination:" DEST--Specify compressed directory and file name read-p "compress[gzip| BZIP2}XZ]: "COMP--Input compressed format case $COMP ingzip) tar-zcf ${dest}.tar.gz $file 1 $file 2 $file 3;; bzip2) tar-jcf ${dest}.tar.bz2 $file 1 $file 2 $file 3xz) tar-cf ${dest}.tar $file 1 $file 2 $file 3 XZ ${dest}.tar;*) echo "unknow." Exit 9;; EsacTest

TopicFTP is often used in daily work, sharing and downloading files, for some unfamiliar with ftp command line personnelUsing FTP for Shared file management is a headache.and FTP If some files need to be uploaded or downloaded regularly every day, it is meaningless for people to repeat the same work.So how do I write a script that automatically downloads or uploads ftp files?Answer reference: 1. ftpput.sh u

You can see in this article: http://www.bkjia.com/Article/201102/83631.html If the ewebeditor filters scripts such as asa, cer, cdx, php, and aspx, add an ashx upload type and upload an ashx script. The script content is as follows:Using System;Using System. Web;Using System. IO;Public class Handler: IHttpHandler { Public void ProcessRequest (HttpContext context ){Context. Response. ContentType = "text/pl

() iflen (input) ==0:continues.send (Input) input=input.split () ifInput[0]== ' Get ':print ' getfile withopen (input[1], ' WB ') asf:Nbsp;f.write (S.RECV (1024x768)) Time.sleep (0.2) ifs.recv (1024x768) == "OOK": print "downfinshnbsp ..." continue NBSP;NBSP;DATANBSP;=NBSP;S.RECV (1024x768) printdataI've been learning Python all the time, but it's always intermittent. Can't insist. Learn for a long time to write a simple socket, this IQ let people

Tags: Shell bash shell variable shell script Yang ShufanIn some complex Linux maintenance work, a lot of repetitive input and operation is not only time-consuming and error-prone, but writing a proper shell script, can be batch processing, automating a series of maintenance tasks, greatly reducing the burden on administratorsShell

Turn from: The world of the Intelligence ReporterThis article combines a number of examples to illustrate how to write a shell script.Why Shell ProgrammingIn Linux systems, although there are a variety of graphical interface tools, sell is still a very flexible tool. The shell is not just a collection of commands, but also a great programming language. You can automate a large number of tasks by using the shell, which is particularly well-suited to sy

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 Nginx-y}Yum_installPw=/etc/nginx/nginx.confRead-p "Please enter group name:" zuRead-p "Please enter the first IP address:" Ip1Read-p "Please enter a second IP address:" IP2Read-p "Please enter a

file;Text Editor:Line Editor: SEDFull Screen Editor: Nano,vi,vimThe first line shelf: gives the shebang, the interpreter path, indicating the interpreter program file that interprets the execution of the current script;Common interpreters:#!/bin/bash#!/usr/bin/python#!/usr/bin/perlAdd a comment with a comment beginning with #;Indent inModerately add blank lines;Blank lines in the

This article describes how to read and write a MySQL database in a shell. This paper mainly introduces how to connect the MySQL database in the shell, how to create the database in the shell, create the table, insert the CSV file, read the MySQL database, export the MySQL database as XML or HTML file, and analyze the core statement. The method described in this article is suitable for PostgreSQL, and in the case of MySQL, it is simpler to read and