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+foreach
+-------
+
+Evaluate a group of commands for each value in a list.
+
+::
+
+  foreach(loop_var arg1 arg2 ...)
+    COMMAND1(ARGS ...)
+    COMMAND2(ARGS ...)
+    ...
+  endforeach(loop_var)
+
+All commands between foreach and the matching endforeach are recorded
+without being invoked.  Once the endforeach is evaluated, the recorded
+list of commands is invoked once for each argument listed in the
+original foreach command.  Before each iteration of the loop
+"${loop_var}" will be set as a variable with the current value in the
+list.
+
+::
+
+  foreach(loop_var RANGE total)
+  foreach(loop_var RANGE start stop [step])
+
+Foreach can also iterate over a generated range of numbers.  There are
+three types of this iteration:
+
+* When specifying single number, the range will have elements 0 to
+"total".
+
+* When specifying two numbers, the range will have elements from the
+first number to the second number.
+
+* The third optional number is the increment used to iterate from the
+first number to the second number.
+
+::
+
+  foreach(loop_var IN [LISTS [list1 [...]]]
+                      [ITEMS [item1 [...]]])
+
+Iterates over a precise list of items.  The LISTS option names
+list-valued variables to be traversed, including empty elements (an
+empty string is a zero-length list).  The ITEMS option ends argument
+parsing and includes all arguments following it in the iteration.