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echo "My working directory is: ${PWD}"
echo "My parent folder is: ${PWD%/*}"
# The lines above are expanded to:
echo "My working directory is: /home/dwmkerr/repos/github/dwmkerr/effective-shell"
echo "My parent folder is: /home/dwmkerr/repos/github/dwmkerr"
xxxxxxxxxx
folder=/home/dwmkerr/backups/2021-10-19
echo "Today's backup folder is: ${folder##*/}"
# The line above is expanded to:
echo "Today's backup folder is: 2021-10-19"