stat file

CPU Performance Metrics 1. Ratio of CPU used by user process 2. Ratio of CPU used by system process 3. Wio, waiting for I/O but the CPU is in idle state ratio. 4. CPU Idle Rate 5. CPU Ratio for context exchange 6,nice 7,real-time 8, run the length

first section CPU utilization and CPU load Under Linux/unix, CPU utilization (CPU utilization) is divided into user state, System State and idle state, respectively, the CPU is in user state execution time, system kernel execution time, and idle

One: Introduction In any computer device, files are all necessary objects, and in Web programming, the operation of files has always been a headache for Web programmers, file operations in the CMS system this is necessary, very useful, we often

Processor usage Here you will extract four data from/proc/stat: User mode (users), low priority user mode (NICE), kernel mode (System), and idle processor Time (idle). They are all located on the first line of the/proc/stat file. CPU utilization is

1, the characteristics of MySQL:1) multithreading, multi-user2) based on C/S (client/server) architecture3) Easy to use, fast query speed4) Safe and reliable2, MySQL compilation installation (* on behalf of the Keyboard tab key)1) Ready to work:

1. Create a new user accountUseradd-The user name of the new parameterParameter description:-C remarks > Add note text. Note text is saved in the remarks field of the passwd. -D login directory > Specify the start directory for user login. -eDate >

LinuxVirtual Machine Network type:Bridged (bridging mode): Virtual machines and hosts in parallel using the networkNAT (network address translation mode): Host provides network to virtual machine by converting network addressHost-only (Local mode):

Logical Backup MysqldumpThe Mysqldump Backup tool was originally written by Igor Romanenko and is typically used to complete a backup of the dump database and porting between different databases, such as upgrading from a low-version MySQL database

This article will share some common Linux command detailed usage, hope can give everybody some helpChange the directory's instruction CD CD Path : Enter the specified directory CD or CD ~: Enter your home directory CD- : Go to the

File attributes (Ls-lhi see the information)1.1 First column: Inode number 1.1.1 What is inodeThe file is stored on the hard disk, and the minimum storage unit for the hard disk is called "Sector" (sector). The size of each "sector" is 512 bytes

File types for Linux-,f: Normal fileD: Directory file, Path mappingL: Link file (symbolic link) soft ConnectDevice files:C: Character device, one-time access to a characterB: Block deviceP: Pipeline FileFi,foS: Socket file, socket 文件系统：

1. PrefaceWork involves file systems, and sometimes it is necessary to determine whether files and directories exist. I combined apue fourth chapter file and directory, summed up how to correctly determine the existence of files and directories,

1. Powerful and usable shellShell: command-line tool. Bash: A terminal used by many mainstream Linux systems (Bourne-again Shell).2. View Help CommandsLong format: Man--help; short format man-hView command details: Man [command]For example, man man

Basic Commands-2Compression and archivingPackaged:Archive, similar to packing before travellingCompression:To reduce the amount of disk space used, backups can be made to save network bandwidth when transferred over the network.Packaged compression

Linux timed Task crontab Cron Service Cron is a timed execution tool under Linux that can run a job without human intervention. Service Crond Start//Startup servicesService Crond stop//Shutdown servicesService Crond restart/

Directory Management:LS cd pwd mkdir rmdir treeFile Management:Touch Stat file RM cp mv NanoDate Time:Date Clock Hwclock calTo view text:Cat tac more less head tailCat: Connect and display (can connect to display multiple files)Split screen

Directory ManagementLS, CD, pwd, mkdir, rmdir, treeFile ManagementTouch, stat, file, RM, CP, NanoDate ManagementDate, clock, Hwcolock, CalView text filesCat, more, TAC, less, head, tailCat: Connect and display a text file-N: Display text line number-

IntroductionMpstat is the abbreviation of multiprocessor statistics and is a real-time system monitoring tool. Some statistical information about its report and CPU, which is stored in the/proc/stat file. In a multi-CPUs system, it not only can view

First, the Linux system structure1.Linux is an inverted tree structure. Everything in Linux is a file. These files are in the top-level directory of the System "/", "/" is the root directory. The "/" directory below is a level two directory, which

Regular Expressions1. Use du-sh/* to see how much memory is consumed by all directories under the root2.lsof-i: view Port3. empty the file,cat/dev/null>access_log empty a file4. If you are creating a directory under the Oldboy/ett directory, what