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When you run a shell script, you have two primary options:
./script.sh: This command runs the script in a new shell. Any variables set or changed in the script do not affect the parent shell.
source script.sh: This command runs the script in the current shell (no new shell is created). Any variables set or changed in the script affect the parent shell.
In this guide, we explore the differences between running shell scripts with source script.sh and ./script.sh, understanding variable scopes, and utilizing special variables like $@, $*, $0, and $#. Additionally, we cover the nuances of exit statuses, file testing with various options, and arithmetic tests. Finally, we compare methods for variable testing and command substitution. Understanding these concepts will enhance your command line efficiency and scripting capabilities.
This article explains how to create a user account with various custom settings in Linux using a Bash script. It covers checking for root user privileges, prompting for user details, creating groups, and setting up home directories and shells. Each command is explained to help understand its purpose and usage in the script.
This article provides a comprehensive guide for IT professionals on bash scripting, explaining each command prompt instruction in detail. It covers variable usage, user input, arithmetic operations, text processing with sed and awk, handling script arguments, and basic control structures like loops and conditionals.
In this guide, we walk through the process of setting up and configuring a Squid proxy server on an Ubuntu machine. We cover updating and upgrading the system, installing Squid and network tools, managing the Squid service, verifying its network listening, modifying the configuration, and testing the setup on a VirtualBox VM. Each command is explained in detail to help you understand its purpose and functionality.