How might I fix the error that I encounter when, in a Cygwin bash shell, I run "vagrant up" in single-node or multi-node of https://github.com/coreos/coreos-kubernetes?
dmahar@PC09 ~/vagrant/coreos/coreos-kubernetes/single-node $ vagrant up '.' is not recognized as an internal or external command, operable program or batch file. failed generating SSL CA artifacts dmahar@PC09 ~/vagrant/coreos/coreos-kubernetes/single-node $ ls -la total 44 drwxr-xr-x+ 1 dmahar Utilisa. du domaine 0 Aug 29 16:18 . drwxr-xr-x+ 1 dmahar Utilisa. du domaine 0 Aug 29 15:56 .. -rw-r--r-- 1 dmahar Utilisa. du domaine 14 Aug 29 15:56 .gitignore drwxr-xr-x+ 1 dmahar Utilisa. du domaine 0 Aug 29 16:18 .vagrant -rwxr-xr-x 1 dmahar Utilisa. du domaine 318 Aug 29 15:56 conformance-test.sh -rw-r--r-- 1 dmahar Utilisa. du domaine 437 Aug 29 15:56 kubeconfig drwxr-xr-x+ 1 dmahar Utilisa. du domaine 0 Aug 29 16:18 -p -rw-r--r-- 1 dmahar Utilisa. du domaine 297 Aug 29 15:56 README.md drwxr-xr-x+ 1 dmahar Utilisa. du domaine 0 Aug 29 16:18 ssl -rw-r--r-- 1 dmahar Utilisa. du domaine 27395 Aug 29 15:56 user-data -rw-r--r-- 1 dmahar Utilisa. du domaine 2310 Aug 29 15:56 Vagrantfile dmahar@PC09 ~/vagrant/coreos/coreos-kubernetes/single-node $ git status On branch master Your branch is up-to-date with 'origin/master'. nothing to commit, working directory clean dmahar@PC09 ~/vagrant/coreos/coreos-kubernetes/single-node $ vagrant --version Vagrant 1.8.5 Thank you, Derek