The OPTION commands sets the logical value of a number of flags that control the behavior of \madx.

OPTION, flag=logical;

Because all attributes of OPTION are logical flags, the following two statements are identical: \madxmp OPTION, flag = true;
OPTION, flag; And the following two statements are also identical: \madxmp OPTION, flag = false;
OPTION, -flag;

Several flags can be set in a single OPTION command, e.g. \madxmp OPTION, ECHO, WARN=true, -INFO, VERBOSE=false;

The available flags, their default values and their effect on \madxwhen they are set to TRUE are listed in table \ref{table:options}.