You can download a file using curl with the following:
curl -o <filename> -H 'X-Auth-Token: <authentication token="">' <storage url="">/<container>/<filename>
For example:
curl -o setup.py -H 'X-Auth-Token: AUTH_tk6253106a51034423b2e3f0ca4b179817' http://127.0.0.1:8080/v1/AUTH_test/bob/setup.py (http://127.0.0.1:8080/v1/AUTH_test/bo...)
This downloads the file 'setup.py' from the container 'bob'.
You can also use the swift application provided by python-swiftclient:
swift -A <url for="" authentication=""> -U <username> -K <key> download <container> <filename>
For example:
swift -A http://127.0.0.1:8080/auth/v1.0 -U test:tester -K testing download bob setup.py