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The awk command language is case sensitive. Change:
awk 'begin {fs=ofs=","} {print $15,$1,$2,$3,$4,$5,$6,$7,$8,$9,$10,$11,$12,$13,$14}' ad.data>ad.csvto:
awk 'BEGIN {FS=OFS=","} {print...

Substitute the sequence


, ... one comma
[ ]* ... zero or more blanks
? ... a question mark
[ ]* ... zero or more blanks
, ... one comma

with


, , ... the string...

^ ... begin of line, as you already pointed out
\s ... whitespace character (blank, tab)
<=k ... a string literal