Freaks City

Arithmetic Operators and Common Commands Common Arithmetic Operators Operator Description +, - Addition and subtraction *, /, % Multiplication, division, and modulo ** Exponentiation ++, -- Increment and decrement !, &&, ` <, <=, >, >= Comparison operators ==, !=, = Equality and inequality checks <&l ...

System Resource Monitoring Disk Usage Evaluation Check the available storage on the root partition: df -Th | grep '^/dev' Memory Consumption Analysis Display physical and swap memory utilization: free --human Processor Load Inspection Monitor real-time CPU usage and running processes: top -b -n 1 | head -n 5 Zabbix Database Volume Assessment ...

Application Management and Deployment Procedures When deploying applications, it's essential to follow a systematic shutdown and startup sequence. The general principle is to close applications in the reverse order they were opened. Shutdown sequence: A → B Startup sequence: B → A After deployment, verify functionality by checking the appplicat ...

Core Features of Bash Command History: Executed commands are stored in ~/.bash_history. This file contains records from previous sessions. Commands from the current active session are held in memory and written to the file upon successful logout. Tab Completion: Command completion: Press Tab after the first word of a command string. File comp ...

Navigate to the system initialization directory to create the service script:cd /etc/init.d/Create a new file named jexus within this directory:vim jexusInput the following Bash script to manage the Jexus service lifecycle. This script handles starting, stopping, and restarting the server while ensuring root privileges are present.#!/bin/bash # ...

The Hidden Challenge: SQL Files Aren't End-User Friendly Working with MySQL data exports regularly, I rarely document these tasks since they're usually stragihtforward. However, a recent scenario prompted me to record my approach due to its specific constraints: I needed to quickly take over an unfamiliar MySQL instance, extract and organize it ...

AWK Text Processing Fundamentals Column Extraction and Field Separation In AWK, you can reference columns using $0 (entire line) through $NF (last column). The following examples demonstrate column extraction: # Display entire line awk '{print}' # Display first column awk '{print $1}' # Display second column awk '{print $2}' # Display las ...

In Linux, there are several ways to execute commands that continue running even after you close your terminal session: Background execution with &: The ampersand symbol allows a command to run in the background. However, if you close your terminal (like Xshell), the process will terminate. nohup command: This allows a command to keep runni ...

While Loop FundamentalsThe while construct evaluates a condition placed after the while keyword. If the condition evaluates to true, the commands within the loop body execute. After reaching the done statement, control returns to re-evaluate the condition. This cycle continues until the condition becomes false. If the condition is initially fal ...

Concatenating StringsVariables can be joined by placing them adjacent to each other.prefix="sys" suffix="_log" combined="${prefix}${suffix}" echo "$combined" # Output: sys_logExtracting Substrings by IndexRetrieve a portion of a string by specifying the starting position and length using the format ${variable:offset:length}.text="deployment" s ...