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Use gawk, /usr/xpg4/bin/awk or nawk on Solaris:



awk 'END {
for (j = 0; ++j <= O;)
printf "%s", o[j] (j < O ? OFS : RS)
while (++i <= m)
for (j = 0; ++j <= O;)
printf...

The record sperator RS is missing for the last record.awk '{printf "%s" ($0 ~ /^[A-Za-z]/?RS $0:FS $0)} END { print RS }' infileUsing printf without format may give an error if printed data contains...

This should work as your sample file...
awk '{printf ($0 ~ /^[A-Za-z]/?RS $0:FS $0)}' infile