Unix_Linux learning (5) -- Understanding Bash and shell (1)

1. what is the shell Operating System Interface? through shell, you can call the corresponding hardware through the kernel. 2. what is Bash? BourneAgainSHell (bash) is actually a version of shell. 3. BashShell functions: 1) command compilation

Chapter 1 Introduction to Linux kernel reading notes (2)

V. Unix kernel Overview: the Unix kernel provides an executable environment for applications to run. Therefore, the kernel must implement a set of services and corresponding interfaces, which are used by applications without directly interacting

Deep understanding of Linux kernel reading notes-Chapter 2-memory addressing (2)

Pages in the hardware: 32-bit linear addresses are divided into three fields: High 10 bits: 10 bits in the middle of the page directory table: 12 bits in the page table: the second-level page table mode is used to reduce the number of RAM required

Image of AIX image and clone learning Notes

I am very entangled in the cloning and mirroring technologies of the aix system. I have read many documents and summarized them. Please criticize and correct them. Image: The same data as the source data, and synchronously update and clone the

Unzip the tar command in linux

Tar [-cxtzjvfpPN] file and directory .... parameter:-c: create a compressed file parameter command (create);-x: unlock a compressed file parameter command! -T: view the files in the tarfile! Note that c/x/t can only store files and directories of...

Vsftpdcmds_allowed permission control

Vsftpdcmds_allowedcmds_allowedABOR, CWD, LIST, MDTM, MKD, NLST, PASS, PASV, PORT, PWD, QUIT, RETR, RMD, RNFR, RNTO, SITE, SIZE, STOR, TYPE, USER, ACCT, APPE, CDUP, HELP, MODE, NOOP, REIN vsftpd cmds_allowed Cmds_allowed = ABOR, CWD, LIST, MDTM, MKD,

Modify webserver site default user group permissions

For example, when the webserver site directory is used to build the nginxwebserver for webtest, the default user and user group permissions are nginx: nginx, that is, nginx. the default user in conf and php-frm.conf is webtest: nginx: nginxnginx.

Ubuntu10.04.4 install the pinyin input method

IBus is a framework that supports multiple input methods. Problem 1: the built-in pinyin input method is incorrect in Ubuntu. by default, it cannot enter Chinese and Chinese phrases. please install other IBus-based input methods independently.

View CPU temperature in LINUX

In Linux, you can use lm_sensors to view the CPU temperature (of course, your hardware must support it first). to use this function, you must support kernel-related modules (such as I2C, next let's talk about the operation method: first check

In ubuntu, you can use eclipse to open the java program written in windows, and the Chinese characters are garbled and the font is modified.

In fact, all Chinese garbled characters are caused by different codes. To enable eclipse to display Chinese characters normally, you need to modify its character encoding steps as follows: 1. click Window in the menu bar, select Preferences2, and

Tomcat service implements configuration of multiple applications

Objective: to install tomcat on a server to implement multiple applications: Modify $ atat_home/conf/server. xml content: & lt; Serverport & quot; 8005 & quot; shutdown & quot; SHUTDOWN & quot; debug & quot; 0 & quot; & gt; & lt; Listenerclass

An error occurred while configuring SSL in Tomcat 7: '/root/. keystore' didnotfindamatchingproperty

After you replace Tomcat 6 with Tomcat 7 today, the following exception occurs in the previously used SSL: Settingproperty & amp; #39; keystoreFile & amp; #39; to & amp; #39; /root /. keystore & amp; #39; didnotfindamatchingproperty. after

How to install and use Xen in Centos5.5

Centos5.5 installation and use of XenXen is a mainstream virtual machine with minimal performance loss (but does not support windows). It can run on x86 systems and is porting to x86_64, IA64, and PPC. Porting to other platforms is technically

View service commands in linux

Linux View Service Command Linux provides the chkconfig command to update and query system services at different running levels. Syntax: chkconfig -- list [name] is used to list the service www.2cto. comchkconfig -- addname is used to add the

Linux inter-process communication (IPC)

1. pipelines: pipelines are one of the first UnixIPC formats supported by Linux. they have the following features: pipelines are half-duplex and data can only flow in one direction. two pipelines must be established when both parties need to

Implementation of the Linuxvim select all function

The implementation of the Linuxvim all-choice function has also been found to see if there are any quick methods to select all, but many of them are repeated and incorrect on the Internet, such as: 1, $ y. What is this? If you want to write it, you

Simulate beagleboard through qemu on Ubuntu

In Ubuntu, qemu is used to simulate beagleboard for QNX/Linux development on beagleboard. The trouble is that you need to connect to the beagleboard development board every time you debug it. it is difficult to connect various connections, and you

Ubuntu12.04 how to use gedit to open txt files with garbled Chinese characters

Ubuntu12.04 how to use gedit to open txt files with Chinese garbled characters Troubleshooting: ubuntu12.04 how to use gedit to open txt files with Chinese garbled characters solution: input and run the command 1gedit--encodinggb18030filename.txt by

Linuxscreen management-ssh disconnection

Linuxscreen management-do not worry about ssh disconnection function description: when using telnet or SSH to remotely log on to linux, if the connection is interrupted abnormally, the system will open a new session when you reconnect, the original

Install Adobe Flash in ubuntu12.04

Ubuntu has two browsers: chromium and firefox. ubuntu do not contain flash. In fact, installing flash is very simple. Download the install_flash_player_11_linux.x86_64.tar.gz file from the official website. My ubuntu is 64-bit .... Install adobe

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