Linux

RHEL7 replaces iptables with FIREWALLD, but iptables can still be used The rule table is to accommodate the rule chain, if the rule table is allowed state, that rule chain is set to the forbidden rule, if the rule table is a forbidden state, that

task target: Customizing the Yum repository: Createrepo, customizing the repo file, installing the HTTPD package with the Yum command, uninstalling the HTTPD package: Yum –y Remove software name, using Yum Install component ' KDE Desktop ': Yum–y

Linux Ugo PermissionsIn the enterprise usually have a file server, it is well known that there are many departments in the company, then file permissions on the file server should be differentiated according to the department or individual, simply

installation is commonly used: remote network installation, U disk installation, CD-ROM installation three ways, the following for the installation of CD1. The boot interface appears, choose to install or upgrade the existing system, select the

1.cd:[-l 丨 [-p[-e]] [dir]CD DIR: Switch the working directory toCD: Switch The working directory to the home directory of the currently logged in userCD-: Switch working directory to previous working directory: Switch back and forth between two

Task: Mount the disc file to the/media directory, go to the packages directory under the/media directory, view all RPM packages installed on the system, see if the system is installing the DHCP package, install the DHCP package, view the DHCP

Outline:Installation and Login commands: Login, shutdown, halt, reboot, install, mount, Umount, Chsh, exit, last;Document processing commands: File, mkdir, grep, DD, find, MV, LS, diff, Cat, ln;System Management Related commands: DF, top, free,

Delete UserUseradd User NameUserdel User Namepasswd PasswordSwitch usersCtrl+alt+f2Get root privileges Su-rootDay Date Calendar calDate Modified on date month of year (Root permission)Init 0 shutdown init 6 restartPWD View Current Location/

Common directivesLS Display file or directory-l list File details L (list)-a lists all files and directories under the current directory, including Hidden A (all)mkdir Creating a Directory-P Create directory, if no parent directory, create p (parent)

Embedded Linux Driver Development processIn embedded systems, the operating system is driven by a variety of drivers to control hardware devices. A device driver is an interface between an operating system kernel and a hardware device that shields

Ubuntu does not have the concept of a drive letter, there is only one root directory/, all files under it /: root directory, only directory under the general root directory, under Linux there is only one root directory. Everything starts here.

Today's internet, the vast majority of web sites, services, games are running on Linux above, although the Linux distribution is numerous, as long as play cooked a distribution, understand the essence of Linux, the basic architecture, design

1. Use WINSCP to store the JDK compression package in/usr/local/.2. The file cannot be installed with the RPM-IVH command because it is a compressed package file.In the console, enter the tar XZVH jdk1.8.0_60 command to extract the JDK files into

The arithmetic operations in Linux are mainly in the following ways:1 Arithmetic expansion:Format: $ (arithmetic)Such as:[Email protected] ~]# r=$ ((3+5))[Email protected] ~]# echo $r8[Email protected] ~]# r=1[[email protected] ~]# echo $

A. The purpose of the cat command is to connect files or standard input and print. This command is commonly used to display the contents of a file, or to connect several files to display, or to read from a standard input and display it, often in

1. Search　　In VI and VIM if you open a large file, it is not easy to find the corresponding content, you can use your own search keywords to search and locate:In the VI and VIM interface input: "/" (backslash), then there will be an input box for

1. View system disk allocation DF2. View all disk devices on the machine cat/proc/partitions3. Create a mount point and create a directory/mnt/ntfs4. Mount Mount-t ntfs/dev/sdb1/mnt/ntfs /dev/sdb1 is hard drive,/mnt/ntfs Local mount point5.

As just the beginning of the students, nothing but video, books, web site posts and other learning methods, although the video is detailed, but the time required to spend is also huge, as far as I know very few people can persevere in a series of

A physical memory and virtual memory         We know that reading and writing data directly from physical memory is much faster than reading and writing data from a hard disk, so we want all of the data read and written to be done in memory, and

Common git commands 1. Basic commandsGit branch view local branchesGit branch-r view remote branchGit checkout xxx switch BranchGit pull origin master // synchronize from remote to local, master or branch nameGit pull origin xxxGit checkout-B xxx: