Shell

1, write a small script named getarp.sh, log the MAC address of each host in the LAN:1. Writing getarp.sh script files(1) Send ARP request via arping command, record MAC address according to feedback result.(2) Assign a network segment address (such

If Else judgment statement　　If statementSyntax Format 1:if condition then statement 1 Statement 2 ... Statement NFISyntax Format 2:Often used in terminal command prompt　if [conditional];then statement; fi　　If Else statementSyntax format:if

See if the script syntax has errors:Bash-n modify_suffix.shTrack executionSh-x modify_suffix.sh AAA1.${var} 2.$ (cmd) 3. () and {} 4.${var:-string},${var:+string},${var:=string},${var:?string} 5.$ ((exp)) 6.$ (Var%pattern), $ (var%%pattern), $

First, System variablesPerform an env, set view system, or environment variable directly at the command line prompt. ENV displays user environment variables, set shows the shell predefined variables and user variables. Can be exported to user

Google Chrome app store has a powerful SSH client (which can replace Putty). The key is that it is integrated into the web page. below is: Its strength is exactly what Chrome's powerful native client has created. The native client can be

Start password for Shell application programming. Welcome to welcome. Description: If you want to lock access to the terminal but do not want to exit and log on again, you can write a script.Program. When the script is called, you can exit only

To delete a process named "ABC", follow these steps!   1. view the process, for example, a process named ABC. You can view its details as follows: PS-Aux | grep-I "ABC"// View all processes that contain ABC characters;   2. Remove the grep

From http://vc88.javaeye.com/blog/658764   Shell if interpretation statement[Front and back Spaces] Leading space[-A file] true if the file exists.[-B file] If the file exists and is a special block file, it is true.[-C file] If the file exists

/** Reference address of this article: * /// Note: If I use ubuntu11.4 and run shell script sh test, an error is returned. Run/bin/bash test to obtain the correct result. String Truncation in Shell STR = "abc123abcabc" # Calculate the length of

1. Preface This is a series of learning documents. Based on the spirit of Internet sharing, it mainly comes from the shell area on the Forum. It has been organized and is the content of a book. Therefore, copyright belongs to the original author

Netsh (Network shell) Configure network interfaces, Windows Firewall, routing & remote access. SyntaxNetsh [Context] [Sub-context] command KeyThe contexts and commands available vary by platform, the list below is for Windows 2008.Use interactive

Creation: 00:49:46Author: unlinuxFrom: http://www.Unlinux.com MeI am a newbie myself. I haven't been in touch with Linux for a long time. Recently I encountered a problem when I learned the bash Export command (the book says that export is changing

Linux Shell script programming-SCP command details Command: SCP There are three common methods to copy files between Linux: The first is FTP, that is, one of the Linux installation FTP server, so that another client program using FTP can be used to

Address: http://www.examw.com/linux/all/114976/index.html Test command usage. Function: Checks files and comparison values. 1) judgment Expression If test (expression true) If test! The expression is false. Test expression 1-A expression 2 both are

1. What is shell?The operating system interface. The shell can call the corresponding hardware through the kernel.2. What is Bash?Bourne again shell (BASH) is actually a version of shell.3. BASH Shell functions:1) command compilation function

In the process of system O & M, log files are often very large. In this case, we need to split the log files. Here, we use shell scripts to split the files :#! /Bin/bash Linenum = 'wc-l httperr8007.log | awk '{print $1 }'' N1 = 1 File =

Shell: common date methods Obtain the time string in LinuxCommand date# Output the current time of 23 days in the format of yyyymmdd$ Date + % Y % m % d-date = '23 days ago' $ Date-uThu Sep 28 09:32:04 UTC 2006 $ Date-RThu, 28 Sep 2006 17:32:28 + 080

Java Sorting Algorithm Implementation Code-shell sorting /** * The Java sorting algorithm implements code-shell sorting. * * @ Author old zizhu Java century network (java2000.net) * */ Public class test { Public static int [] A = {10, 32, 1,

This article is also the fifth chapter of "Learning the bash Shell" 3rd Edition, five of Flow Control's reading notes, but we will not limit it to this. Flow control is a common part of any programming language, including while and util, which are

// Use shell to search for multiple files find. -type f | xargs grep flash description: find the files in the front directory and Its subdirectories that contain flash files // record the xargs command: xargs obtains the parameter list and one