Add command line for scripts using gempy on BE

docs/expert/operations/ctp7.md

@@ -6,6 +6,14 @@ linked below, you will find various expert level documentation to set up
 and configure the CTP7, as well as various hints to debug and resolve
 various issues.
 
+## Launching a pyhton script with `gempy` on the AMC
+
+To launch a script that needs to access the registers through gempy, that is installed on the BE, one can use the command line in this way:
+
+``` bash
+ssh gempro@gem-shelfXX-amcYY "bash -l -c 'python -'" < <path-to-my-python-script>
+```
+
 ## In-depth CTP7 overview
 
 The CTP7 runs a special 32-bit version of linux located on a 32GB flash