Split large file into smaller files without disturbing the entry chunks

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05-10-2018

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Code:

awk '
NR == 1 {("stat -c%s " FILENAME) | getline SZ           # right at the start: read file size into SZ variable
         SZ /= 8                                        # calculate chunk size
         FN = FILENAME "_" ++c;                         # determine first output file name
        }

        {if (CNT > SZ)  {if (FN) close(FN)              # if chunk size reached: close old file
                         FN  = FILENAME "_" ++c;        # determine next output file name
                         CNT = 0                        # reset size count
                        }
         CNT += length                                  # sum up line lengths into CNT
         print $0 ORS > FN                              # print line to output file incl. empty line
        }
' RS= file                                              # empty record separator means: empty line, i.e.
                                                        # double line feed, is a record separator

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