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How about this:


echo "xx yy zz" | awk 'BEGIN{FS=" "}{ for (i=1; i<=(NF-1); i++) { printf("%s,", $i); } printf("%s\n", $NF); }'

This snippet handles both a quoted 4th field and an unquoted 4th field
as long as the 4th field is always two characters long:


awk -F',' \
' { if ( substr($7,2,2) == "01" || $4 == "01"...