add s4cmd CLI example

README.md

@@ -7,6 +7,21 @@ export AWS_ACCESS_KEY_ID="${MY_AWS_ACCESS_KEY_ID}"
 export AWS_SECRET_ACCESS_KEY="${MY_AWS_SECRET_ACCESS_KEY}"
 ```
 
+## s4cmd examples
+
+S4cmd supports the regular commands you might expect for fetching and storing
+files in S3: `ls`, `put`, `get`, `cp`, `mv`, `sync`, `del`, `du`.
+
+Details see [README.md](/usr/share/doc/s4cmd/README.md.gz)
+
+```
+sudo apt install s4cmd
+export S3_ACCESS_KEY_ID="${MY_AWS_ACCESS_KEY_ID}"
+export S3_SECRET_ACCESS_KEY="${MY_AWS_SECRET_ACCESS_KEY}"
+s4cmd  --endpoint-url=https://rise-s3.zib.de ls
+```
+
+
 ### Links
 
 * [ceph S3 examples](https://github.com/ronaldddilley/ceph-s3-examples)