Thanks Rick and Ken for your offerings on splitting lists.
I now understand why eval has to be used. I had been living in hope
that there was some command that would take a list as an argument and
return the list split out into arguments. I've now put my brain
into gear: a TCL command always returns a list, there is no way a
command can be used to split a list into separate arguments.
If I understand correctly the eval command works as follows:
1. takes its arguments and uses the same algorithm as concat
to build a command.
2. passes that command to the TCL interpreter.
I suppose eval does one other thing between 1 & 2. It takes the list
that results from the concat command and splits it into separate
arguments to pass to the interpreter. Because the eval command is
done in C code it is able to do this magic.
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