Open Source Software : Shell Script Tasks

Author: Prantik Kesariya - 24BCE11016 Course: Open Source Software Linux

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Project Overview

This project contains five Bash shell scripts written as part of the Open Source Audit assignment. Each script demonstrates core Linux shell scripting concepts and must be run on a real Linux system.

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Scripts

Script 1 : System Identity Report

File: script1_system_identity.sh
Topics: Unit 1 & 2

Displays a welcome screen with key system information including the Linux distribution name, kernel version, current user, home directory, system uptime, date/time, and the open-source license covering the OS.

Concepts used: variables, echo, command substitution $(), basic output formatting

How to run:

./script1_system_identity.sh

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Script 2 : FOSS Package Inspector

File: script2_package_inspector.sh
Topics: Unit 2

Checks whether a chosen open-source package is installed, shows its version, and prints a short philosophy note about the package using a case statement.

Concepts used: if-then-else, case statement, dpkg, pipe with grep

How to run:

./script2_package_inspector.sh

Note: Change the PACKAGE variable inside the script to check a different package.

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Script 3 : Disk and Permission Auditor

File: script3_disk_permission_auditor.sh
Topics: Unit 2

Loops through a list of important system directories and reports the permissions, owner, and disk usage of each. Also checks if the chosen software's config directory exists.

Concepts used: for loop, ls -ld, du, awk, cut

How to run:

./script3_disk_permission_auditor.sh

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Script 4 : Log File Analyzer

File: script4_log_analyzer.sh
Topics: Units 2 & 5

Reads a log file line by line, counts how many lines contain a given keyword, retries if the file is empty, and prints the last 5 matching lines.

Concepts used: while read loop, if-then, counter variables, command-line arguments ($1, $2)

How to run:

./script4_log_analyzer.sh /var/log/syslog error

Argument	Description	Required
$1	Path to the log file	Yes
$2	Keyword to search for (default: error)	No

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Script 5 : Open Source Manifesto Generator

File: script5_manifesto_generator.sh
Topics: Unit 5

Asks the user three interactive questions and composes a personalised open-source philosophy statement, then saves it to a .txt file.

Concepts used: read for user input, string concatenation, writing to a file with > and >>, date command, aliases (demonstrated via comment)

How to run:

./script5_manifesto_generator.sh

The output file will be named manifesto_<username>.txt

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Setup & Execution

Prerequisites

• A Linux system (Ubuntu, Fedora, CentOS, etc.) or WSL on Windows
• Bash shell

Steps

# 1. Make all scripts executable
chmod +x script*.sh

# 2. Run any script
./script1_system_identity.sh
./script2_package_inspector.sh
./script3_disk_permission_auditor.sh
./script4_log_analyzer.sh /var/log/syslog error
./script5_manifesto_generator.sh

Running on Windows (via WSL)

# Open PowerShell and type:
wsl

# Navigate to the project folder
cd /mnt/d/Open\ source\ project/

# Make scripts executable and run
chmod +x script*.sh
./script1_system_identity.sh

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Shell Scripting Concepts Summary

Concept	Used In
Variables & echo	Script 1, 2, 3, 4, 5
Command substitution $()	Script 1
if-then-else	Script 2, 3, 4
case statement	Script 2
for loop	Script 3
while read loop	Script 4
grep, awk, cut	Script 2, 3, 4
Command-line arguments $1	Script 4
read for user input	Script 5
File redirection > >>	Script 5
date, whoami, uname	Script 1, 5