Linux--is an operating system, released in 1991 by Linus Torvalds, the core is the kernel version number

1. Server: 1u/2u/4u server, generally DELL/HP/IBM
2.red Hat (component first, charge)/centos (adapted from Redhat)/ubuntu (Graphical interface System)/suse (developer use)
3.centos Download: (i386:32 bit/x86-64:64 bit) depends on the server physical memory size, less than 8G Select 32 bits, and vice versa 64 bits. The installation process is the same.
4.centos-6.5-i386-bin-dvd1.iso 4G: Contains all installed files.
5. Installing vmware-create a new virtual Machine-typical-linux (RedHat)
6.Network adapter:bridged (virtual machine built and the same as its own machine)/nat (virtual machine creation, Internet access via host)/host-only (do not access the network)/custom (custom mode)/lan segment
7.cd/dvd:useiso image file: Download DVD file, display: show resolution
8.Install or upgrade an existing system upgrade version
9.Install system with basic video driver: Install a new version, minimal
10. Server noise, high thermal requirements, need to be hosted in the room, we operate the server through the Remote Management tool management: PUTTY/XSHELL/SECURECRT (telnet plaintext transmission)
11.dhclient: auto-Generate IP
12.xshell Set name/protocol: ssh/Host: ip/and other information, set the terminal code display UTF-8
13.ifconfig: View information such as virtual machine IP.
14.uname-r: Check the kernel version of the Linux system: This version number is odd is the development version, even for the stable version. 2 (Major Version). 6 (Minor version: development or stability). 32 (number of modifications) -358.e16.i686
15.LS Viewing catalog files
16. Root file System "/" Tree directory structure: Bin: The executable command for ordinary users; ETC: storage configuration file; media: mount point; OPT: third-party application installation directory; root: Home directory for superuser; boot: Home directory for normal users ; MNT: mount point, Configuration mapping file; sbin: executable command for Superuser; dev: Store device files
17.linux Partition: Establish a basic partition → Set up an extended partition → Divide the extended partition into several logical partition primary partitions p+ extended partitions e:p+e<=4 extended partitions can be partitioned logically (can be used).
18.fdisk-l: View disk status. DEV/SDA:A: first hard drive; B: Second hard drive; C: Third hard drive. DEV/SDA1: Represents the first partition of the first hard disk (the representation of a hard disk partition: In Linux is represented by hd*x or sd*x, where * represents a, B, c ... number 1, 2, 3 ... HD is mostly IDE hard disk; SD is mostly SCSI or Mobile storage)
19.date: Displays the current time of the system, 1752/09 Western calendar and lunar replacement.
20.cal 09 1752: View calendar for specific dates
21.history: View the command history.
22.pwd: Show Current position
23.CD: Switch directory; CD/CD ~: Return to home directory; CD.: Back to parent directory; CD.: Current directory; CD-: Go back to last directory
24.shutdown-r now/reboot/: Restart
25.halt/shutdown-h now: Turn off the machine

Linux--is an operating system, released in 1991 by Linus Torvalds, the core is the kernel version number