Freaks City

Logical Operators && - Logical AND || - Logical OR ! - Logical NOT Integer Comparisons Traditional numeric comparison operators: -eq - Equal -ne - Not equal -gt - Greater than -ge - Greater than or equal -lt - Less than -le - Less than or equal Alternative syntax using double parentheses: (("5" < "10")) ((&qu ...

Project Structure OverviewThe automation solution is organized into specific directories to separate concerns:lib/: Contains external Java libraries required for the setup, including dom4j for XML parsing and the MySQL JDBC driver.software/: Stores the binary packages for Hadoop and Hive (e.g., hadoop-2.6.0-cdh5.10.0.tar.gz).scripts/: Houses th ...

When managing extended file transfers or computational tasks on a remote server, foreground execution frequently encounters session timeouts or network drops. If a command is already running in the foreground and needs to be moved to the background without restarting, Linux job control provides a reliable workflow to achieve persistent executio ...

Data integrity is a critical component of server administration. Relying on manual intervention often leads to inconsistent recovery points. To mitigate this risk, an automated solution utilizing a Bash script provides a reliable mechanism for performing consistent dumps, compressing the output, and securely replicating archives to a remote ser ...

Directory Navigation and Path Resolution 1. pwd Prints the absolute path of the current working directory. This is useful for verifying your exact location within the filesystem hierarchy. 2. cd Changes the active shell directory. It accepts both absolute paths (originating from the root /) and relative paths (originating from the current worki ...

Creating Files with touch Syntax touch [options] filename Key Options Option Description -m Update modification timestamp -d Set specific datetime Examples # Create file in current directory $ touch example.txt # Create file with absolute path $ touch /tmp/sample.txt # Create multiple files $ touch file1.txt file2.txt file3.txt $ ...

Developing and testing interactive programs locally often proves cumbersome due to the intricacies of process communication. While tools like testlib.h are standard in competitive programming, they can sometimes be overly complex or dififcult to configure for quick debugging. An efficient alternative involves using native Linux features like na ...

Vim Process inspection: ps -ef | grep PID Delete text: Ctrl+U: Remove all characters before cursor Ctrl+K: Remove all characters after cursor Batch replacement in Vim: :%s/old/new/g Example: :%s/docker\.io/registry.cn-hangzhou.aliyuncs.com\/acs-sample/g Paste formatted code: :set paste Show line numbers: :set nu Delete all content: :%d ...

CPU Utilization Threshold Alert Monitor processor load and trigger a notification when usage exceeds a defined limit. This implementation calculates active CPU time by subtracting the idle percentage reported by top. #!/usr/bin/env bash ALERT_LIMIT=75 CURRENT_LOAD=$(top -bn1 | awk '/^%Cpu/ {print 100 - $8}') if awk "BEGIN {exit !($CURR ...

Obtaining sub-second precision in Linux environments requires leveraging either shell built-ins or external libraries. The GNU date command supports nanosecond resolution via the %N directive, while Python’s standard library offers flexible multipliers for milliseconds or microseconds. # Capture current timestamp with nanosecond precision NANO_ ...