This article is from the Apple II Csa2 FAQ, by Jeff Hurlburt with numerous contributions by others.
Use variables in a command this way:
120 PRINT CHR$(4) "BSAVE NARF, A$2000, L"; NB
Line 120 says that the Length of NARF is the value of variable NB. NB is used
here to represent the number of bytes (in decimal) to be saved.
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