rs232 commands

Common Linux commands (9) and common linux commands The cat command is used to connect files or standard input and print. This command is often used to display the file content, connect several files, or read and display the content from the standard input. It is often used with the redirection symbol. 1. Command Format: Cat [Option] File 2. command functions: Cat has three main functions: A. the entire fi

Common Linux commands (6) and common linux commands The mv command is short for moving files. It can be used to move files or rename files. It is a common command in Linux and is often used to back up files or directories. 1.Command Format: Mv [Option] source file or directory target file or directory 2.Command function: Depending on the type of the second parameter in the mv command (whether it is the ta

Common Linux commands (4) and common linux commands The linux mkdir command is used to create a directory with the specified name. The user who creates the directory must have the write permission in the current directory, and the specified directory name cannot be an existing directory in the current directory. 1. Command Format: Mkdir [Option] Directory 2. command functions: The mkdir command can be used

Common Linux commands (22) and common linux commands The chmod command is used to change the access permissions of linux system files or directories. Use it to control access to files or directories. This command can be used in two ways. One is the text setting method that contains letters and operator expressions, and the other is the number setting method that contains numbers. In Linux, each file and di

Common O m cmd commands and O M cmd commands @ Echo offset PortNum = 3306for/f "tokens = 15" % a in ('ipconfig ^ | findstr/I/c: "IP Address "') do (set IP = % a) for/f "tokens = 5" % a in ('netstat-ano ^ | findstr "% IP %: % PortNum % "') do (set PID = % a) echo Port Number % PortNum % the corresponding PID is: % PID % pause 1. Find the process with a known port number You can also use the follow

Linux-related decompression commands and linux decompression commands ZIP We can use the following command to compress a directory: # Zip-r archive_name.zip directory_to_compress Below is a zip file: # Unzip archive_name.zip TAR Tar is a widely used document packaging format in Linux. Its advantage is that it only consumes a very small amount of CPU and time to package files. It is only a packaging tool and

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