While checking the documentation, the process fails at )undo in ug01.
(1) -> a:=1
(1) 1
Type:
PositiveInteger
(2) -> )undo 1
>> System error:
Couldn't delete file
/home/hemmecke/v/git/NAGcdrom/development/redo.input:
No such file or directory
Since simply saying 'touch redo.input' in the unix shell makes undo work
and 'rm redo.input' makes it not work, there should be a test whether
redo.input actually exists before attempting to remove it.
In fact, I don't really know, why FriCAS should still support )undo at
all. Is there someone who is actually using it?
Ralf
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