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With that sparse specification, limited sample extent, just guessing the record structure (8 fields) and assuming the second record to be incomplete, how about
awk -F^ '{while (NF <= 7 && 1 ==...

Hi.

Utility csplit was designed for these kinds of tasks, so:
csplit -k -z data1 '/^A/' '{*}'
produces byte counts and creates files:
56
56
42
56

xx00 xx01 xx02 xx03
Sample, contents...

Just in case the input file does not start with an "A" record, try awk '/^A/ || NR==1 { if(F) close(F); F=sprintf("%s%d", NAME, ++N) } { print > F }' NAME="File" inputfile

You could also do file0001, file0002, etc, etc, which sorts more nicely in a directory listing, by putting "%s%04d" in sprintf instead.

Why 'file' and not 'file4', or does that matter?

awk '/^A/ { if(F) close(F); F=sprintf("%s%d", NAME, ++N) } { print > F }' NAME="File" inputfile Use nawk on solaris.