[SAC-HELP] "Cut" command in SAC

[Mac Green]

How exactly do I implement the CUT command in SAC for a case like this:

I have a file called     data.sac
The number of points=N
I want only the first M points of the file.

It is the option given in the help files that Uses B and N, but I can not
implement it.

Thanks in advance.
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