Freaks City

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_ ...

Overview of expr The expr command is used for integer arithmetic and string operations (like length and pattern matching) in shell scripts. 1. Syntax and Basic Usage Only integer arithmetic is supported. Operators and numbers must be separated by spaces; otherwise, errors occur. The multiplication operator (*) must be escaped. When using expr i ...

Navigating the Filesystem pwd Command pwd Displays the absolute path of the current working directory. cd Command cd [target_directory] Changes the current shell session's working directory. Usage: cd ..: Move up to the parent directory. cd /home/user/docs: Navigate using an absolute path (starts from root /). cd ../projects: Navigate using ...

pwd: Print Working Directory The pwd utility outputs the absolute path of the current working directory. It is primarily used to verify your location within the filesystem hierarchy before executing path-dependent operations. Syntax pwd [options] Usage Example $ cd /var/log/nginx $ pwd /var/log/nginx cd: Change Directory The cd command ...