SHELL

bash -s flag

#use -s flag with ln command to create symbolic links in linux
sudo ln -s "path/to/actual/file" my_sym_link.txt

bash "-z" flag

# -z flag returns true if NULL or uninitialized variable

if [ -z "$NULLVAR" ]; then
	echo "Not initialized"
else
	echo "Exists"
fi
# Not initialized