Java Bash Shell

This project is a Shell Application that mimics a subset of Bash scripting capabilities in Java. This includes common Unix commands and salient features like redirection, substitution, sequence commands and piping. This project was completed for National University of Singapore's CS4218 Software Testing.

Getting Started

Prerequisites

Have Java 8 or later installed on your machine.

Installation

1. Clone the repo

   git clone https://github.com/nicholas-gcc/java-bash-shell.git

2. Compile the project

   javac -d bin src/main/java/sg/edu/nus/comp/cs4218/*.java src/main/java/sg/edu/nus/comp/cs4218/**/*.java

   This command compiles all the Java files in the specified directories and saves the compiled bytecode files in the bin directory.

3. Run the entry point of the application

   java -cp bin sg.edu.nus.comp.cs4218.impl.ShellImpl

Usage

Supported Features

1. Piping

   echo "Hello, world!" | tee output.txt

2. I/O Redirection

   cat file.txt | wc -l > line_count.txt

3. Sequence Commands

   cp sample.txt new.txt; cut -c 6-7 new.txt

4. Command Substitution (With single quotation marks)

   echo "'cat file.txt'"

5. Globbing

   ls somePattern*

Commands

Command	Flags Supported
cat	-n
cd	N/A
cp	-r, -R
cut	-b, -c
echo	N/A
exit	N/A
grep	-v,-i, -c, -H
ls	-R, -X
mv	-n
paste	-s
rm	-r, -d
sort	-n, -r, -f
tee	-a
uniq	-c, -d, -D
wc	-c, -l, -w