jtl2dat.sh

# Write column headers to data file
$ echo "t lt ts s lb rc rm tn dt by" > $DATAFILE

# Extract values in quotes
$ sed -n '/^<httpSample/{s/[^"]*\("[^"]*"\)[^"]*/\1 /gp}' $JTLFILE >> $DATAFILE

# Data file looks something like this...
$ head $DATAFILE

t lt ts s lb rc rm tn dt by
"319" "319" "1348598679755" "true" "service-M" "200" "OK" "Thread Group 1-1" "text" "2918" 
"2167" "2159" "1348598680583" "true" "service-J" "200" "OK" "Thread Group 1-1" "text" "2853" 
"22" "22" "1348598683251" "true" "service-A" "200" "OK" "Thread Group 1-1" "text" "6114" 
"31" "31" "1348598685752" "true" "service-M" "200" "OK" "Thread Group 1-2" "text" "2918" 
"192" "186" "1348598686284" "true" "service-J" "200" "OK" "Thread Group 1-2" "text" "2853" 
"24" "24" "1348598686977" "true" "service-A" "200" "OK" "Thread Group 1-2" "text" "6114" 
"4999" "4999" "1348598683774" "true" "service-E" "200" "OK" "Thread Group 1-1" "text" "10869" 
"190" "190" "1348598689274" "true" "service-E" "200" "OK" "Thread Group 1-1" "text" "9893" 
"9" "9" "1348598689965" "true" "service-B" "200" "OK" "Thread Group 1-1" "text" "6520"