r2d2 commands

Detailed explanation of CentOS commands (ps commands) The ps command is used to display information about the current process.1. Command FormatPs [parameters]2. Command Parameters -A: displays all processes. -N: displays all processes that do not match the specified parameter. -A: displays all processes except the control process and the five-stop process. -D: display all processes except the con

Details of Common commands on Linux servers and Common commands on linuxI. User 1. useradd is used to create an account. Useradd newname // create newnamepasswd newname // set change the password. After entering this command, you will be prompted to enter the password 2. delete a user userdel newname 3. Switch users su - youruser 4. ssh remote login ssh -l root 192.168.0.11ssh root@192.168.0.11 Specified P

Summary of common linux commands and parameters (basic) and common linux commands 1. user's home directory (~) In linux, users all have their own home directories. you can place your own configuration files and other things. pwd: list the current directory. optional parameter-P: when the current directory is a link directory, the real path is displayed. ls: List Files And Directories: optional parameter:-a:

Mysql modifies columns, adds columns, deletes common column commands, and mysql commands Alter table: add, modify, and delete TABLE columns, constraints, and other TABLE definitions. View column: desc table name; Alter table t_book rename to bbb; Add column: alter table name add column name varchar (30 ); Delete column: alter table Name drop column name; Alter column name MySQL: alter table bbb change nnnnn

Summary of Common commands in linux and summary of Common commands in linuxClear terminal screen Clear terminal screen usageClearCommand orCtrl + LCombination of shortcut keys. However, this operation does not actually clear the screen. If you scroll up, you can still see the previous output. So you can also useResetCommand to truly clear the terminal screen.Definition of the command line Environment [Ro

Linux-Common commands for daily system management and Common commands for linux1: W view the overall load of the system. You cannot view the specific load, such as memory or disk.23:25:20 up 13 min, 2 users, load average: 0.00, 0.01, 0.01User tty from login @ IDLE JCPU PCPU WHATFlex tty1-0.01 s 0.01 s-bashFlex pts/0 192.168.75.1 0.00 s 0.02 s 0.00 s tmuxThe first line shows the time, system running time, nu

How to fix rpm commands (accidentally delete rpm commands) When executing the rpm-e -- nodeps command, I did not note that I wrote the rpm-e -- nodepsrpm command. As a result, the rpm was uninstalled. I can do this! You can also stop yourself. But if it commits suicide, it should be able to be revived. Think about the solution. If you use the reinstall method to solve this problem, it will not be resolved.

Xin Xing sorts out common query commands in Linux, and Xin Xing sorts out linux commands. View version, operating system, or cpu Information File:/etc/issue view OS version/proc/cpuinfo view cpu Information Command: hostname to view the computer name uname to view the operating system information lspci to list all pci devices Lsusb list all usb devices lsmod list to load modules View system resource usage

Arp for linux commands and arp for linux commandsArp commands are used to display and modify IP addresses used by the Address Resolution Protocol (ARP) to the Ethernet MAC (Ethernet physical address) conversion table.Arp syntax format: arp [-evn] [-H type] [-i if] -a [hostname]arp [-v] [-i if] -d [hostname] [pub]arp [-v] [-H type] [-i if] -s hostname hw_addr [temp]arp [-v] [-H type] [-i if] -s hostname hw_a

Common Linux commands-file search command find, common linux commands Command name: findCommand path:/bin/findSyntax: find [search range] [matching condition]Function Description: file search ExampleFind/etc-name initFind the file init In the/etc directory-Iname is case insensitive.* Represents a wildcard? Represents a character Find/-size + 204800Search for files larger than MB in the root directory+ N

Detailed description of vi commands and vi commands Esc switch mode Esc + I insert before the cursor Esc + a Insert after cursor Esc + o line feed Esc + u undo Esc + dl delete a character Esc + dd delete a row Esc + x delete a character Esc + yy copy a row at the cursor + p paste it to the next row of the cursor Esc + q do not save and exit Esc + wq! Force exit after saving Pwd current path S

Common Linux commands and common linux commandsCommand [Option] [parameter]------------------------ Positioning ------------------------Cd webapps/-- locate webappsCd .. -- return to the parent directoryCd--- return to the last directoryCd -- return to the home directory-- Display the complete path of the current filePwd-- Clear screenCtrl + L------------------------ Demonstration ------------------------Ls -- display the file list--- Display detailsL

Detailed explanation of jstat commands and display results, and detailed explanation of jstat commands Reference Original:Http://blog.163.com/yangshuo_qq/blog/static/2554680201272871350110/Http://zizihaier.iteye.com/blog/1157245 Jstat1. jstat-gc pidThe gc information is displayed, and the gc count and time are displayed.The last five items are the young gc count, young gc time, full gc count, full gc time,

Record some recently used commands, record usage commands (Command to paint in green) View the device USB command:Ls/dev/ttyUSB * The serial number of the device first inserted into the PC is small, for example, the OpenJTAG device and USB to serial port device are successively inserted. They are ttyUSB0 and ttyUSB1 respectively. Logon telnet command:Telnet local host 4444 Ln command: This command

Common Git commands and common Git commands Mkdir:XX (create an empty directory XX refers to the directory name) Pwd:Shows the path of the current directory. Git initChange the current directory to a manageable git repository and generate a hidden. git file. Git add XXAdd xx files to the temporary storage area. Git commit-m "XX"Comments are followed by the submitted file-m. Git statusView repository status

Summary of Common commands for android development and common commands for android Development 1. compile the project Enter the project directory, for short, 2. Installation Project Ant debug install, which version should be determined during installation. Note: Go to the project directory and execute this statement. 3. Start the android Simulator Emulator-avd av, av is the name of the simulator 4. list

Common linux commands and linux commands 1. Network Parameter Setting command 1. ifconfig: Query and SET network card and IP network segment parameters 1.1 man manual Definition DESCRIPTION Ifconfig is used to configure the kernel-resident network interfaces. It is used at boot time to set up interfaces as necessary. After that, it is usually only needed when debugging or when system tuning

[Django] user permission operation commands (1), django operation commands To create a py file for testing, add the following code to the file. # Coding: UTF-8 import OS. environ. setdefault ("DJANGO_SETTINGS_MODULE", "www. settings ") ''' when the Django version is greater than or equal to 1.7, add the following two statements: import djangodjango. setup () otherwise, the error django will be thrown. core.

Summary of Common commands for GDB debugging in Linux, and Common commands for gdb Prepared by: longshike Email: longshike2010@163.com 2016-01-05 Gdb is the default debugging tool in Linux. When compiling a program file, such as debug. c. To use gdb for debugging, you must add cc-g or gcc-g before the terminal command to compile debug. c can be obtained using the following command: gcc -g -o debug debug.c E

Common nmap commands and nmap commands 1) obtain the system type and open port of the remote host nmap -sS -P0 -sV -O -SS tcp syn scan (also known as semi-open or stealth scan)-P0 allows you to Disable ICMP pings.-SV: Enable System Version Detection-O attempts to identify remote operating systems Other options: -A: Enable the operating system fingerprint and version detection at the same time.-V: Output S