Loop statements
while (expression)
{
statement(s);
Executed repeatedly
while expression is true.
}until (expression)
{
statement(s);
Executed repeatedly
while expression is false.
}do
{
statement(s);
Executed at least
once, and repeatedly while expression is true.
}
while
(expression)do
{
statement(s);
Executed at least
once, and repeatedly while expression is false.
}
until
(expression)for (initialisation; condition;
increment)
{
statement(s);
Execute the
initialisation statement (e.g. assigning an initial value to the loop
counter). While the condition expression is true (e.g. test for the loop
counter having reached its final value) execute the statement(s) then
the increment statement (e.g. to increment the loop
counter).
}foreach $scalar_var
(@list_var)
{
statement(s);
Execute
statement(s) once for each item in the list variable. Within the loop,
the scalar variable is an alias for the current item: changing the scalar
variable's value also changes that list item. The original scalar variable of
that name is unaffected.
}