Linux

I. Downloads of related Resources①debian series Ubuntu is more suitable for desktop version of the operating systemHttp://www.ubuntu.org.cn/desktop②redhat series Red Hat operating systemCentOS( Same as community maintenance version of Redhat source

xargsRead data from standard input (stdin) for processing Data is separated by a space Can be processed one or more times according to the parameters, the default processing command is/bin/echo Empty lines are not processed and are

Recently, because of work needs, new learning a few Linux commands, record. Content Reference Related BlogsHttps://www.cnblogs.com/ggjucheng/archive/2013/01/13/2856901.htmlHttps://www.cnblogs.com/peida/archive/2012/12/28/2837345.htmlhttp://blog.csdn.

Account======================================View account:#id is looking at the ID information of the current login account, identifyUid=0 (Root) gid=0 (root) group =0 (Root)Subordinate group of the main groupThe UID system is used to identify the

There's a principle in safety, called the principle of least privilege.According to this principle, to start an application or process, you should give it the minimum permissions, according to the application permission requirements, create a user

Note: This document only records the most commonly used commands and the parameters under the command, more commands please refer to the Linux documentation or use the command Help, man, info for the corresponding queryCommon file Directory

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, quota, at,

There are two types of links: static links, dynamic links.Static linksThe content of the library is added to the executable program by the linker when it is linked.　　Advantages :? Less dependence on the operating environment, with better

The concept of time in a kernelThe kernel calculates and manages time with the help of the hardware. The hardware provides a system timer for the kernel to calculate elapsed time. SystemThe system timer triggers itself at some frequency, resulting

A basic concept of I/OCharacter device: A device that is accessed in an orderly manner by a stream of characters. such as serial port, keyboard and so on.Block device: A device in the system that does not have to access a fixed-size piece of data

One user space and kernel spaceThe Linux kernel divides the space of this 4G byte virtual address space into two parts:The highest 1G bytes (from virtual addresses 0xc0000000 to 0xFFFFFFFF) are used by the kernel, which is called "kernel space".L

The first thing to figure out is that the individual believes that the help in Linux is not intended to allow us to use it to learn new knowledge, but to help us revive our memories.There are several ways to help as follows: Help--help

Count the number of files in a folderLs-l |grep "^-" |wc-lCount the number of directories under a folderLs-l |grep "^d" |wc-lThe number of files under the statistics folder, including subfoldersLs-lr|grep "^-" |wc-lAll txt files in the

1.ls [Options] [Directory name | list all directories and files in the relevant directory-a 列出包括.a开头的隐藏文件的所有文件-A 通-a，但不列出"."和".."-l 列出文件的详细信息-c 根据ctime排序显示-t 根据文件修改时间排序---color[=WHEN] 用色彩辨别文件类型 WHEN 可以是‘never‘、‘always‘或‘auto‘其中之一 白色：表示普通文件

1th ChapterThe display failure is:the login system is displayed as: -bash-4.2$ fault2nd ChapterHow to resolve:Failure reason: The current user's environment variable file is missing or corrupt,Solution: Copy the correct files to the user's home

The Linux add environment variable is mainly implemented by adding the path variable value, as follows:If you want to add a path to $path, you can do this as follows:1, console settings, not in favor of this way, because he only to the current shell

There are 5 types of compressed package formats common to Linux: Zip tar.gz tar.bz2 tar.xz tar. ZWhere tar is a packaging format, and the suffixes such as GZ and bz2 are the means of compression: gzip and BZIP2Unzip the filename. zip :Unzip Filename.

FTP is the file Transfer Protocol protocol, which is a protocol designed to transfer files. Simply put, a server that supports the FTP protocol is an FTP server.FTP supports two modes: PORT (Active), PASV (passive).Port mode: First the FTP client

Linux installation can be roughly divided into 2 stagesFirst stage: AnacondaThe second stage: The Installinstall phase system will be automatically installed according to the parameters set in the Anaconda phase, here is the anaconda phase, this

LFS: Homemade Linux operating systemConvert E:/fs:ntfsHash cache path after external command executionReset resets when the connection tool appears garbledAlias aliasesUnalias Canceling aliasesHalt Poweroff Shutdown [Time (default in seconds)]