UNIVERSITY OF WEST ATTICA
SCHOOL OF ENGINEERING
DEPARTMENT OF COMPUTER ENGINEERING AND INFORMATICS

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Operating Systems I

Bash Scripts

Vasileios Evangelos Athanasiou
Student ID: 19390005

GitHub · LinkedIn

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Supervision

Supervisor: Vasileios Mamalis, Professor

UNIWA Profile

Co-supervisor: Georgios Pentaris, Postdoctoral Researcher

UNIWA Profile

Athens, January 2022

Bash Scripts Assignment

This repository contains a comprehensive assignment for Linux shell scripting, designed to enhance students’ proficiency in managing the Linux file system and processes through Bash scripts.

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Table of Contents

Section	Folder/File	Description
1	assign/	Assignment material for the Bash Scripts workshop
1.1	assign/OS1_Lab_Ask-2-2021-22.pdf	Assignment description in English
1.2	assign/ΛΣ1_Εργ_Ασκ-2-2021-22.pdf	Assignment description in Greek
2	docs/	Bash script scenarios and explanations
2.1	docs/Bck-Script.txt	Backup script scenario in English
2.2	docs/Bck-Σενάριο.txt	Backup script scenario in Greek
2.3	docs/Cmpdir-Script.txt	Compare directories script scenario in English
2.4	docs/Cmpdir-Σενάριο.txt	Compare directories script scenario in Greek
2.5	docs/Createpvs-Script.txt	Create PVS script scenario in English
2.6	docs/Createpvs-Σενάριο.txt	Create PVS script scenario in Greek
2.7	docs/Mfproc-Script.txt	Mfproc script scenario in English
2.8	docs/Mfproc-Σενάριο.txt	Mfproc script scenario in Greek
2.9	docs/Searching-Script.txt	Searching script scenario in English
2.10	docs/Searching-Σενάριο.txt	Searching script scenario in Greek
3	src/	Bash script source files
3.1	src/bck.sh	Backup script
3.2	src/bck1.sh	Backup variant 1 script
3.3	src/bck2.sh	Backup variant 2 script
3.4	src/cmpdir.sh	Compare directories script
3.5	src/createpvs.sh	Create PVS script
3.6	src/mfproc.sh	Mfproc processing script
3.7	src/searching.sh	Searching script
4	README.md	Repository overview and usage instructions

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Project Overview

The assignment covers five Bash scripts that handle:

1. Searching Files – Using find, ls, and grep to filter by permissions, modification time, and directory access.
2. Directory Comparison (cmpdir) – Identifying unique and common files, moving them, and creating hard links.
3. Directory Creation (createpvs) – Creating directories with proper permissions and ownership.
4. Backup (bck) – Archiving files/directories using tar with optional scheduling via cron or at.
5. Process Management (mfproc) – Displaying processes by user or state (Running, Sleeping, Zombie).

The goal is to strengthen Linux CLI skills and shell scripting expertise.

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Requirements

• Operating System: Linux (or WSL for Windows)
• Shell Environment: Bash or compatible
• Commands Used: find, ls, grep, chmod, chown, tar, cron, at, ps, etc.

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Installation & Usage

1. Clone the Repository

git clone https://github.com/Operating-Systems-I/Bash-Scripts.git
cd Bash-Scripts

2. Make Scripts Executable

chmod u+x searching.sh createpvs.sh cmpdir.sh bck.sh bck1.sh bck2.sh mfproc.sh

3. Run Scripts with Arguments

./searching.sh $1 $2
./createpvs.sh $1 $2 $3 $4
./cmpdir.sh $1 $2 $3
./bck.sh $1 $2 $3
./bck1.sh $1 $2 $3 $4
./bck2.sh
./mfproc.sh