[cc65] C64 drive direct access question

I would like to use the "M-W" command to send commands from the C64 to the
1541 drive but I'm a little stuck on the syntax I need to use. The BASIC 2.0
command is:

-----------------
(from page 105 of "Inside Commodore DOS")

t=18 : rem track
s=0 : rem sector
job=176 : rem $b0 = seek

print#15,"M-W"chr$(6)chr$(0)chr$(2)chr$(t)chr$(s)
print#15,"M-W"chr$(0)chr$(0)chr$(1)chr$(job)
-----------------

How to I do the chr$(x) with cbm_write? Is this correct?

cbm_write(15, "m-w\x06\x00\x02\x18\x00", 8);

Thanks,
/*Raj*/

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