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lappend(n) [centos man page]

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


lappend - Append list elements onto a variable SYNOPSIS
lappend varName ?value value value ...? _________________________________________________________________ DESCRIPTION
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. EXAMPLE
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 SEE ALSO
list(n), lindex(n), linsert(n), llength(n), lset(n), lsort(n), lrange(n) KEYWORDS
append, element, list, variable Tcl lappend(n)

Check Out this Related Man Page

llength(3tcl)						       Tcl Built-In Commands						     llength(3tcl)


llength - Count the number of elements in a list SYNOPSIS
llength list _________________________________________________________________ DESCRIPTION
Treats list as a list and returns a decimal string giving the number of elements in it. EXAMPLES
The result is the number of elements: % llength {a b c d e} 5 % llength {a b c} 3 % llength {} 0 Elements are not guaranteed to be exactly words in a dictionary sense of course, especially when quoting is used: % llength {a b {c d} e} 4 % llength {a b { } c d e} 6 An empty list is not necessarily an empty string: % set var { }; puts "[string length $var],[llength $var]" 1,0 SEE ALSO
list(3tcl), lappend(3tcl), lindex(3tcl), linsert(3tcl), lsearch(3tcl), lset(3tcl), lsort(3tcl), lrange(3tcl), lreplace(3tcl) KEYWORDS
element, list, length Tcl llength(3tcl)
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