I get the following error in the Data Loader cmd when trying to Upsert some custom object records;
"field name provided, does not match an external ID"

My GCD_ID__c field is categorised as an External ID and the same sdl file works perfectly when i use the Apex Data Loader tool rather than the cmd. So the mappings are definitely correct.

Maybe i am missing something in my xml file?

Okay folks, I know this is a n00b question but I can't remember if or how to initialize a string with a set of arguments.

 

What I want to do is something like this

 

 

List<String> alphabet = { 'a' , 'b' , 'c' ...  };

 

How can I do this?