lappend(n) Tcl Built-In Commands lappend(n) 







lappend - Append list elements onto a variable








lappend varName ?value value value ...?












This command treats the variable given by varName as a list
    and appends each of the value arguments to that list as a separate
    element, with spaces between elements. If varName does not exist, it
    is created as a list with elements given by the value arguments.
    Lappend is similar to append except that the values are
    appended as list elements rather than raw text. This command provides a
    relatively efficient way to build up large lists. For example,
    “lappend a $b” is much more efficient than
    “set a [concat $a [list $b]]” when $a is
  long.








Using lappend to build up a list of numbers.




% set var 1
1
% lappend var 2
1 2
% lappend var 3 4 5
1 2 3 4 5












list(n), lindex(n), linsert(n), llength(n), lset(n), lsort(n),
    lrange(n)










append, element, list, variable







  

    
    Tcl