Linux

The file I/O mentioned here refers to the non-cached;1. For IO operations with caching and IO operations without caching, see another article:Detailed with cache IO and without cache IOThe file IO (without the cached IO) in Linux is typically used

1, first to see the server version of the system, is 32-bit or 64-bit Uname-alinux ay131105092932706327z 2.6.32-358.6.2.el6.x86_64 #1 SMP Thu may 20:59:36 UTC, x86_64 x86_64 x86_64 GNU /linux X86_64 is 64 bit, if you're not sure, you can change the

1.rsync Introductionrsyncis a UNIX application, it can update the files and directories of two computers synchronously, and make use of the differential coding to reduce the data transmission. One of the important features of rsync that is not seen

management and scheduling of processesProcess ManagementProcess descriptors and task structuresThe process is stored in a two-way circular list called the task Queue (tasklist). Each item in the list contains all the information for a specific

grub.conf file is missing or corruptedwhen we switch to the/boot/grub directory, we will see an important configuration file grub.conf. At this point we can delete the file or move it to simulate another error, here we delete the file. And then we

In Linux sometimes you need to execute the script (test.sh) and executable (EXE) in the background, using the following method:Nohup./test.sh &Nohup./exe &The execution of this program can be completely run in the background, for what? Because if

# uname-a # View kernel/Os/cpu information# head-n 1/etc/issue # view OS version# cat/proc/cpuinfo # View CPU Information# hostname # View computer name# LSPCI-TV # list all PCI devices# LSUSB-TV # list all USB devices# lsmod # List of loaded kernel

1. View the kernel version command:1) [[email protected] ~]# cat/proc/versionLinux version 2.6.9-22.elsmp ([email protected]) (GCC version 3.4.4 200507213.4.4-2)) #1 SMP Mon Sep 18:00:54 EDT 20052) [[email protected] ~]# uname-alinux q1test01 2.6.9-2

some commands for Linux background process management: FG, BG, Jobs, &, CTRL + Z commands for everyone to learn referenceFirst, &Add to the end of a command, you can put this command in the background execution, such as Gftp &Two, CTRL + ZYou can

Compiling the kernel manuallyIn general, the core work of the kernel is directly in the kernel, and most of the other features have the following three options:1. Do not use this function2. Compile these functions into the form of modules3. Compile

Sometimes there are some problems that need us to catch the packet analysis, when you do not have a professional grasp of the package tool, you can use tcpdump to replace (the general release of the tool itself)For example, we want to analyze the

Bought an SSD hard disk, just want to compare with ordinary mechanical disk, because the desktop is installed Ubuntu system, so you want to use the Linux command simple testThe following are SSD performance data:Test write:[Email protected]:~ > Time

Whereis Find the installation path for the software-B finds only binary files-M only find help files-S find source code only-U excludes the specified type file-F Show file name only-B Find binaries in the specified directory-M Find help files in

The file search command in the CentOS system: which Which (search for "execution Files 』) [Root @ linux ~] # Which [-a] commandParameters:-A: Lists All commands that can be found, not the first command name.Example:[Root @ linux ~] # Which

Ubuntu 64-bit wps Installation First, go to the official website to download wps. Address: http://community.wps.cn/download/ Switch to the download directory and run the following command: $ sudo apt-get install ia32-libs* Then execute the

MySQL Optimization on Linux Currently, most of the MySQL running environments are on Linux. Here we provide some general and simple policies on how to optimize MySQL on the Linux operating system. These methods help improve MySQL performance. If

5 Linux free CSS editors A computer system cannot have no operating system, and developers of large companies have also developed a complex and easy-to-use operating system. Linux is regarded as a complex system, and it is still the most commonly

Basic Linux knowledge 1. User Logon Graphical logon interface and text Logon (modify logon mode,/etc/inittab) 2. X Window. Open the terminal on the GUI 3. Shell Access the shell through the terminal to deal with the system kernel 4. Console,

Linux File Operation commands 1 Bytes ----------------------------------------------------------------------------------------------View directory: ls-a or ls-r View the log file: cat file name. log --------------------------------------------------

Mysql allows remote login configurationMysql-h 10.17.11.187-uroot-ploushangTo enable remote logon, follow these steps:1. log on to Mysql-Server to connect to local mysql (only local connections are allowed by default)2. Modify the user configuration