bash - Print Record Number with a prefix -

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i have shell script creates csv output file below (on separate lines) :

aaa,111 bbb,222 ccc,999

i want have record number first column in above output such as,

dm1,aaa,111 dm2,bbb,222 dm3,ccc,999

how create variable dm within shell script?

use awk:

awk '{print "dm" nr "," $0}' input.csv >output.csv

or

... | awk '{print "dm" nr "," $0}' >output.csv

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