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I apologize; I must have been asleep when I looked at your code yesterday. Change:
awk '!/^$/{ a=substr($0,1,4) print $0 > "SBSCR." a ".txt"}' harsha1.txtto:
awk '!/^$/{ a=substr($0,1,4); print $0...

print $0 > "PREFIX." a ".txt"

As we are talking 17 files only, the close although correct could be ommitted: $ awk '{print > substr ($0,1,4)}' file

awk '{F=substr($0,1,4)".txt";print >> F;close(F)}' input_file