is there a command line method for exporting plots as jpg files and gif files?

As the title suggests, that is what one of my current "fool around" projects requires. I have tried to do this using the HTTP package together with the StringTools package, and had mixed results, the main issue being is that in performing the HTTP Get request it  returns an error code unless i constantly import valid "spam" from my clipboard from an external internet brower. 

I will keep working on the way i forsee this being possible, and dont ask why a want to do this from a command line approach rather than just using a search engine, yes i have a good reason for this. If you have done this before, id appreciate the help as it will enable me to improve my life quite a bit.

Ok this is an extract from the help page, i have no idea what this means nor how a procedural function that orders a finite list of objects in a certain way could possibly be described as "non deterministic", so i really really need someone to help me here please, most confusing part is in bold:

sort(L, F)
 

If F is the symbol address, then the elements are sorted by address (a non-deterministic run-time specific property of the underlying data structure)
 

Hello, i need to remove specific elements of a list but cannot do so with the conversion to a set and the use of the difference operation, because there are other repeatitions that are important so i cannot impose the condition of uniqueness in the process of excluding these elements, and want to keep other repeatitions in the original multiset.

I know this must be fairly straight forward because the "Remove Duplication" function retains the order of the original multiset

EDIT: i seem to have found a way to it using the "SearchAll" function from the ListTools package, so i can then reconstruct a second list by specifying a set of sequence ranges paritioned accordingly to the indices of the elements of the original i want removed that are obtains using this "SearchAll" function

Hello, I have attached an image that shows an example of what i want to do, but wanted to see if there was already conventional notation and a package that exists in maple. 

In general, i want to customize binary operations and assign index values, in the example here those index values are the modulo for the equivalence classes for which the binary operator may have elements of as operands, but in another example would be to say assign in to  "~"  in reference to it being the equivalence relation for a congruence class modulo that index.

Thanks in advance, 

Adam.