decrement <target> [by <number>]
decrement command adds to an existing variable, property, or attribute. It defaults to adding the value
1, but this can be changed using the
by modifier. If the target variable is null, then it is assumed to be
0, and then decremented by the specified amount. The
decrement command is the opposite of the
increment command command.
If you target a string variable, then
+= to add the string to the end of the target variable.
set counter to 5 decrement counter by 2 -- counter is now 3 decrement newVariable -- newVariable is defaulted to zero, then decremented to -1