Linux

wildcard characters and special symbolsSpecial symbols:Quotation mark series:$ () and ' run inside the command"The output of the inside command intact"" To run the special symbol parsing insideREDIRECT series:> Standard output redirection>> Standard

passwd file:File path: vi/etc/passwdOpen file There's a shuttle, and now it's time to explain the meaning of each part.　　The contents of each line in the file are the same, separated by ":", the following is the corresponding relationship:=

1, grep [content]/data/boy only display the contents of the file, others do not show.grep General Common parameters:-I: Ignore case when matching-N: The line number is displayed at the beginning of the matching content-V: Match content without

Gzip gunzip zcat bzip2 bunzip2 bzcat xz unxz xzcatA:gzip usage# gzip file Compressed files do not retain source files directly generated file.gz# Zcat file.gz can temporarily save gile.gz compressed files to other space in the terminal output for

. zip is a compressed file type common to Linux and WindowsSyntax: Zip [options] [Compressed files] [source files]Example: [[email protected] yang]# zip install.log.zip install.logAdding:install.log (deflated 9%)Unzip extracting. zip Compressed

1. Create a group testgroup;2, create a user a2012, first create it with the default settings, and then add the user to the Testgroup group. 3, create user a2013, its owner directory is/tmp/a2013, its main group is Testgroup, additional group is

Linked files take up only metadata space, which is the process of associating the metadata of a file with the dataLinks are broken down into hard links and soft joinsHard Links:The data block pointer in the inode directly points to a link to the

First, the foregoingAwk is a powerful text analysis tool. In contrast to Grep's lookup, the SED editor, awk is especially powerful when it comes to analyzing data and generating reports.To put it simply, a wk is to read the file one line at a

First, Summary of Knowledge points:What is Shell:shell is a system program provided to the user by the Linux/unix system to interpret the user's commands. It is the interface between the user and the system kernel.Common shell commands are: sh, csh,

Log into Oracle's website under Linux and download the unpacked JDK Portal The system is downloaded to the downloads directory by default. Create the folder where you want to unzip the file: Where the-p parameter represents a

some simple things to know: Linux is the operating system Like Windows, you can do exactly the same thing, but it's relatively stable. More than 80% servers in the world are Linux Andriod system is Linux, in fact, Mac system is UNIX

1, SED flow editor, to achieve the deletion of the text and replace the search,Can process multiple files at the same time more than one line of content, you can not change the original file, the entire file into the screen, you can only match to

#include #include#includestring.h>#include#ifnndef win32#include#include#endif#defineDefault_disk_path "/work"typedefstructStatfs disk,*Pdisk;//Gets the structure that contains disk space informationBOOLGetdiskinfo (Pdisk DiskInfo,Const Char*path) {

Asterisks represent any character, such as *.txt？ Represents any one character: Represents a delimiter for different commands#代表配置文件的注释| Represents a pipeline~ Represents the user's home directory-Represents the last catalog$ variable content in

First, prefaceFor bash's environment settings file, which is divided into system settings and personal settings , it is generally recommended that the user directly modify the individual settings.The test environment for this article is:

　　　My computer is the WINDOWS10 operating system, installed on the above virtual machine version 12, using the centos6.8 version of the image file installation. Note that you must use the root user to have permission to modify the contents of the

1. File or Directory PropertiesThe properties of a Linux file or directory include: The file or directory's node, kind, permission mode, number of links, the user and user group to which it belongs, the time recently accessed or modified, and so on.

Ctrl+ucut all characters before the cursor in the command line (excluding itself)ctrl+k cut all characters (including itself) after the cursor in the command lineCtrl+d Delete the character at the cursor locationctrl+h Delete the previous character

Need to download 3 packages: Address link: Link: https://pan.baidu.com/s/1lltAa6JnjJ7Mr88duixUSQ Password: 5YIW(1) rsh-0.17-14.i386.rpm(2) rsh-server-0.17-14.i386.rpm(3) rpc.rstatd-4.0.1.tar.gzFirst, installation rshSee if RSH is installed and

Mutex Amount: The mutex provides protected access to the shared resource, two states of it: Lock and unlock, to ensure that only one thread is using the shared resource for a certain period of time, and that the data type of the mutex is