Shell

This article mainly introduces the Linux Shell Script series tutorial (vi): array and associative array, this article explained what is the array and associative array, the definition prints the ordinary array, the definition prints the associative

If you are a maintenance engineer, you are likely to face dozens of, hundreds of or even thousands of servers, in addition to bulk operations, environmental synchronization, data synchronization is also essential skills. When it comes to "sync,"

The shell is also called a command-line interface, which is the interface between the user and the computer under the *nix operating system. The term shell refers to programs in the operating system that provide access to kernel services. This

The commonly used HBase startup scripts are: 1. $HBASE _home/bin/start-hbase.sh Start the entire cluster 2. $HBASE _home/bin/stop-hbase.sh Stop the entire cluster 3. $HBASE _home/bin/hbase-daemons.sh Start or stop, all regionserver or

Use the Shell to judge #!/bin/sh mypath= "/var/log/httpd/" myfile= "/var/log/httpd/access.log" #-x parameter determines whether the $mypath exists and has executable permissions if [!-X "$myPath"]; Then mkdir "$myPath" FI # Here's the-D

This article explains what the process of a Linux command is going through when it executes. And the approximate sequence of these processes.1.1 Shell parsing command lineThe approximate operation of the shell when reading and executing commands is

ObjectiveThe shell script was recently restarted due to job requirements. Although most of the commands are often used by themselves, they are always hard to read when written in scripts. And I always find it hard to read when I look at scripts

Now mostly use the Xshell, because Xshell has a personal free, or Chinese interface, for this level four is barely over, really good.Putty because it is too small, so often a lot of features can not be satisfied.SecureCRT in function with Xshell

1.2.1 Echo's quote questionFor the use of ECHO, note that the special case of single and double quotes is the point. To print "Hello world!" As an example.Echo Hello world!Hello world!Echo ' Hello world! 'Hello world!Echo " Hello world! "

Linux in any case is to use the shell command, in the actual use of the shell, programming experience is very easy to get started, but a little more difficult is the shell inside the symbols, a variety of special symbols when we write the shell

Original address: http://blog.sina.com.cn/s/blog_62eb16bb01014dbh.htmlOnce the trap captures the signal, there are three ways to react:(1) Execute a procedure to process this signal(2) The default action to accept the signal(3) Ignoring this

In daily work, a lot of things to deal with the computer often, especially high frequency use of some professional software, or play some keyboard streaming nature of the game, you should be familiar with the commonly used shortcut keys, so play not

1 about test testing, see the man documentationThe judgment of an expression(EXPRESSION) #EXPRESSION is True! EXPRESSION #EXPRESSION is FalseExpression1-a EXPRESSION2 #both is true,-o means orWhether the string is empty, equal-N string #the length

1. Monitor CPU utilization (via Vmstat tool)#!/bin/bash#====================================================# Author:lizhenliang-email:[email Protected]# Create DATE:2015-02-01# DESCRIPTION:CPU Utilization Monitor# blog:lizhenliang.blog.51cto.com#===

many times when using the Linux shell, we need to handle the file name or directory name, the usual operation is to extract the file name from the path, extract the directory name from the path, extract the file suffix name, and so on. For example,

There are three types of quotes in the shell: single quotes, double quotes, and anti-quotes. The single quotation mark ' character nonalphanumeric, enclosed by single quotes, appears as a normal character. When special characters are enclosed in

As already mentioned, variable names can only contain numbers, letters, and underscores, because some variables that contain other characters have special meanings, and such variables are called special variables.For example, $ represents the ID of

From: http://blog.csdn.net/xyp84/article/details/4435899 Today, I wrote a shell script, which runs normally on my machine. To my colleagues, run the syntax error near unexpected token error. I can check the shell script on the left and right, but

Linux Command Line and shell script programming Daquan: Version 2ndBasic InformationAuthor: (US) Blum (R.) Bresnahan. c.) [Translator's introduction]Translator: Wu HaifengSeries name: Turing programming SeriesPress: People's post and

Execute shell commands in the program to automatically obtain all the online IP addresses and open ports in the LAN (Linux), shelllinuxPreface The question is a bit long. It is actually the following: first, let the Shell command be executed in the