1$6 !~ /^ack/ && $5 !~ /[SFR]/ {
2          # given a tcpdump ftp trace, output one line for each send
3          # in the form
4          #   <send time> <seq no>
5          # where <send time> is the time packet was sent (in seconds with
6          # zero at time of first packet) and <seq no> is the tcp sequence
7          # number of the packet divided by 1024 (i.e., Kbytes sent).
8          #
9          # convert time to seconds
10          n = split ($1,t,":")
11          tim = t[1]*3600 + t[2]*60 + t[3]
12          if (! tzero) {
13                    tzero = tim
14                    OFS = "\t"
15          }
16          # get packet sequence number
17          i = index($6,":")
18          printf "%7.2f\t%g\n", tim-tzero, substr($6,1,i-1)/1024
19          }
20