sorting by creation time in ls(), , * This message: [ Message body ] [ More options

You could do it indirectly by saving your command history (a good idea 
in any case :-) ),  doing {something} to dump it to a file, and 
sorting/seeking to see in what order you created items.

Or, if you're really creative ^_^,  write some sort of script/function 
which automatically creates a metafile (e.g. if the variable is VAR, the 
metafile is .VARtime) from the output of date().

> When trying to remember what did I do in the session, especially after
 > coming back to it after a few days, I'd like to mimic Unix's ls -ltrh --
 > does R retain the timing a certain variable is created? If not, would
 > it make a useful addition, to have ls with an option to sort by creation
 > time?
 >