lvarpush var string ?indexExpr?
The lvarpush command pushes (inserts) string as an element
in the list contained in the variable var. The element is
inserted before position indexExpr in the list. If index is
omitted, then 0 is assumed. If var does not exists, it is
created.
If the expression indexExpr starts with the string "end", then
end is replaced with the index of the last element in the
list. If the expression starts with "len", then len is replaced
with the length of the list. Note the value of "end" means
insert the string ''before'' the last element.
See also lvarpop.
Category Command, a part of Tclx