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].


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[Category Command], a part of [Tclx]