|
참고 : http://cs.binghamton.edu/~nael/classes/cs528/proj1.html |
If we want to extract information from the "task1_out.nam" file and compute the total bytes of TCP/FTP traffic over the link from node 3 to node 4, we run the following Awk command (in file "task1_tcp.awk"):
awk '$1== "r" && $7==3 && $17==1 && $9=="tcp" {a += $11} END {print a}' task1_out.nam
In this command, "$1", "$7", "$17", and "$9" mean the 1st (event type), 7th (destination node), 17th (flow identifier) , and 9th (packet type) columns of each line in file "task1_out.nam". "a" is an Awk variable that is used to calculate the total bytes. Awk scans the input file "task1_out.nam" line by line, and parses the line column by column.
Similarly, you can run the following Awk command (in file "task1_udp.awk") to compute total bytes of UDP/CBR traffic:
awk '$1=="r" && $7==3 && $17==2 && $9=="cbr" {b += $11} END {print b}' task1_out.nam
Now you can compute the total bytes of TCP/FTP and UDP/CBR traffic and the ratios of TCP/FTP and UDP/CBR traffic by using a more elaborate Awk script (in file "task1_total.awk"):
awk '{if ($1== "r" && $7==3 && $17==1 && $9=="tcp") {a += $11} else if ($1== "r" && $7==3 && $17==2 && $9=="cbr") {b += $11}} END {printf (" tcp:\t%d\n cbr:\t%d \n total:\t%d\n tcp ratio:\t%.4f \n cbr ratio:\t%.4f\n", a, b, a+b, a/(a+b), b/(a+b))}' task1_out.nam
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