echo "making directory tmp-testing"
rm -rf tmp-testing
mkdir tmp-testing
echo ""
echo "chdir: tmp-testing, REDIRECT: echo 'Hi, mom' TO  hello.txt"
cd tmp-testing
echo "Hi, mom!" > hello.txt
ls
cat hello.txt
echo "Testing pipes:  PIPE FROM ls -l TO wc"
ls -l | wc
echo "Removing tmp-testing directory"
rm hello.txt
cd ..
rmdir tmp-testing
echo
