Tiny Shell is a simple and light-weight virtual shell program. You can run 1) any command-line program and 2) Input / Output redirect. It limits to use command-line arguments.
Run the run script file like following:
./run.sh
Input.txt file to the screen:
cat < Input.txt
Write messages from command-line to Output.txt:
cat > Output.txt
Write messages from Input.txt to Output.txt:
cat < Input.txt > Output.txt