Set the cursor position in the command line to byte position {pos}. The first position is 1. Use |getcmdpos()| to obtain the current position. Only works while editing the command line, thus you must use |c_CTRL-_e|, |c_CTRL-R_=| or |c_CTRL-R_CTRL-R| with '='. For |c_CTRL-_e| and |c_CTRL-R_CTRL-R| with '=' the position is set after the command line is set to the expression. For |c_CTRL-R_=| it is set after evaluating the expression but before inserting the resulting text. When the number is too big the cursor is put at the end of the line. A number smaller than one has undefined results. Returns FALSE when successful, TRUE when not editing the command line. Can also be used as a |method|: GetPos()->setcmdpos()