CentOS 7 Cheat Sheet: Essential Commands and Configurations
CentOS 7 Cheat Sheet
Root Password Recovery
- Go to CentOS rescue mode.
- Press e.
- Go to the end of the Linux line and add rd.break.
- Press Ctrl x.
- Type mount -o remount,rw /sysroot/ –> chroot /sysroot/ –> passwd root –> touch /.autorelabel –> and then “exit” * 2
Network Configuration
- nmcli d to check the network name.
- Example command: nmcli con add con-name static ifname enp0s8 type ethernet ipv4.method manual ipv4.address 192.168.2.200/24 ipv4.gateway 192.168.2.1 ipv4.dns 192.168.2.254 +ipv4.
A Comprehensive Guide to Industrial Automation and Control Systems
What is Industrial Automation and Control Systems?
SISO and MIMO Interconnection Systems
Interconnection systems can be physical or logical:
- SISO (Single Input, Single Output): A single input results in a single output. Example: Simple closed control loops.
- MIMO (Multiple Input, Multiple Output): Multiple inputs are used to control multiple outputs. Example: Complex systems with open-loop feedback.
Choosing Between PLC and DCS Systems
Consider these factors when deciding between a Programmable Logic
Read MoreAutomotive Engineering Guide: Transmission Systems, Industry Insights, and EV Technology
1. Compare Different Types of Transmission Systems in an Automobile
Manual Transmission:
- Operation: Driver manually shifts gears using a clutch and gear stick.
- Components: Clutch, gearbox, gear stick.
- Advantages: Greater control, generally more fuel-efficient, simpler design.
- Disadvantages: Requires skill, tiring in traffic, prone to driver error.
Automatic Transmission:
- Operation: Automatically changes gears, no manual shifting needed.
- Components: Torque converter, planetary gear set, hydraulic controls.
Object-Oriented Programming: Concepts and Principles
Basic Concepts of Object Oriented Programming
It is necessary to understand some of the concepts used extensively in object-oriented programming. These include:
- Objects
- Classes
- Data abstraction and encapsulation
- Inheritance
- Polymorphism
- Dynamic binding
- Message passing
1. Objects
Objects are the basic run time entities in an object-oriented system. They may represent a person, a place, a bank account, a table of data or any item that the program has to handle. They may also represent user-defined data such
Read MoreUnderstanding Process Control: Feedback, Feedforward, and Advanced Strategies
Understanding Process Control
The gain of the controller can be adjusted to make the output changes as sensitive as desired to deviations. The sign of the gain can be chosen to make the controller output increase or decrease as the error signal increases. The bias must be adjusted so that when there is no error (steady-state desired conditions), the controller output and the manipulated variable are at their nominal steady-state values. Whenever the controller gives a signal that makes the control
Read MoreIntroduction to Printed Circuit Boards (PCB) Design and Manufacturing
UNIT 1. CAD/CAE/CAM
CAD (Computer Aided Design)
Technique of designing a computer-based product and capturing its schematic diagrams using software.
Components of CAD:
- Editor: Schematic editor with a library of components.
- Processor (Database Connectivity): Renders the circuit design and connects to simulation programs or PCB layout tools.
CAE (Computer Aided Engineering)
Electronic CAE involves verifying the functionality of the designed product through computer simulations.