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Wildcards Shell wildcards are used for filename and directory name matching. They are processed by the shell and appear exclusively in command arguments. Wildcard Patterns Pattern Description * Matches any sequence of characters, including empty strings ? Matches exactly one character [] Matches any single character within the specif ...

The tee command acts as a splitter in a pipeline, reading from standard input and writing simultaneously to standard output and one or more files. Its core value is allowing operators to inspect a data stream in real time while preserving it for later processing or auditing. command | tee [options] file [file2 ...] Options Overview -a, --appe ...

The Linux terminal serves as the interface between users and the kernel, interpreting shell commands that control system operations. Mastering these commands is essential for effective system management. Keyboard Shortcuts Ctrl+Alt+T: Launch new terminal Ctrl+Shift+N: Open terminal in current directory Privilege Escalation The sudo comand all ...

The pipe operator (|) is one of the most powerful features in Linux, enabling you to chain multiple commands together. This article explores how pipes work, how they differ from redirection, and demonstrates practical filter command usage. How Pipe Operators Work A pipe connects the standard output of one command to the standard input of anothe ...

To verify the connectivity of all IP addresses within a network segment, multiple approaches can be used. Two methods are presented here: a single-process implementation and a multi-process version. Single-Process Ping Implementation (Sequential Processing) #!/bin/bash read -p "Enter the network portion of the IP address: " network_ip ...

Linux shell configuration files—.bashrc, .bash_profile, and .profile—control how your command line environment behaves. Each file serves a distinct purpose based on shell type and session mode. Understanding these differences helps you set up aliases, environment variables, and startup commands correctly. .bashrc: Interactive Non‑Login Shell Co ...

MariaDB Installation yum install mariadb mariadb-server mariadb-libs -y systemctl start mariadb netstat -tnlp | grep :3306 MariaDB runs without a default password, allowing direct access via the mysql command. Database Setup CREATE DATABASE school DEFAULT CHARACTER SET utf8; Table Definitions CREATE TABLE student ( s_id VARCHAR(20), s ...

Introduction to Redirection There are situations where saving the output of a program to a file is necessary for later analysis. For instance, if you have a compiled program named myprog, you can disassemble it and store the result in a file called output using the following command: objdump -d myprog > output The > symbol is used for re ...

Effective system administration relies on robust monitoring scripts. This guide explores best practices for implementing service health checks and automated recovery using Bash conditional logic. 1. System Resource Monitoring To monitor system memory and alert administartors, we can leverage the free utility. The following script checks if avai ...

Conditional Expression Syntax Bash supports four syntax forms for condition testing: Syntax Description test expression Uses the test command [ expression ] Single brackets, functionally identical to test [[ expression ]] Double brackets, enhanced version of the above ((expression)) Double parentheses, typically used with if statem ...