Flush: Famous little Unix shell

What is Flush?

Flush is a console application with much of the same functionality as a simple Unix shell, written in C.

Flush supports the following:

• Running executables in your PATH, for instance ls, cd, grep, etc...
• I/O redirection
• Background tasks, with a custom implementation of the jobs command
• Pipelines

See examples below.

Demo

In the demo above, you can see some of the supported commands in this shell.

Running the application

Using cmake and make

# Navigate to the project directory
cd assignment_3

# Create a build directory, if it does not already exist
mkdir build

# Navigate to the build directory
cd build

# Compile the project using cmake
cmake ..

# Build executable using make
make

# Run the application
./flush

Without using cmake and make

# Navigate to the project directory
cd assignment_3

# Compile the project
gcc src/app.c src/background_tasks.c src/command_line_parser.c src/commands.c \
src/io_redirection.c src/linked_list.c src/logger.c src/main.c src/pipelines.c \
src/process.c -o flush

# Run the application
./flush

Functionality

# Execute some system call
ls -l
echo "Hello, world!"
sleep 2

# Change directory
cd ..
cd ~

# IO redirection
ls -l > out.txt
head -1 < README.md
head -1 < README.md > out.txt

# Start a background task
ls -l > out.txt &
sleep 10 &

# Get an overview of all background tasks
jobs

# Pipelines
ls -l | grep flush | wc -w
ls -l | grep flush > out.txt

# Terminate the program using CTRL + D