How can i see the summary or aggregate values in jmeter jtl file - jmeter

Question

Am running recorded jmeter performance script (by adding summary and aggrgate listners), in non-gui mode using Maven. After running am getting .jtl file, but am not seeing the values for summary and aggregate values.
how can i see the summary or aggregate report in .jtl file, without opening Jmeter GUI.
We are planneing to run through jenkins on daily basis. Once jtl file is generated the other script has to look the values for summary / aggregate values and show it on the dashboard.
Can anybody please help me regarding this.

Answer 1

Typically I set the results file int the Summary Report Listener and select the fields I want to get back. When you run the test via non-gui (ie through Jenkins) you will get the summary results file and it should be in your workspace.
Here is my JMX file, testing some mobile APIs. JMeter Test Plan and Results
Also to note is the Generate Summary Results Listener. Per the docs
In Non-GUI mode by default a Generate Summary Results listener named "summariser" is configured,
This will not show up in the JTL but will show up in your log file and will generate lines such as
2015/08/28 15:14:33.305 INFO - jmeter.reporters.Summariser: summary = 2200 in 169s = 13.0/s Avg: 17 Min: 2 Max: 5129 Err: 0 (0.00%)

Answer 2

The values you're used to see in Aggregate Report / Summary Report listeners are being calculated from the following metrics:
timestamp
elapsed
success
bytes
latency
For instance:
Average metric is sub of "elapsed" times for all the samplers divided by samplers count.
Median metric is a common statistical measurement basically 50% percentile
90%, 95%, 99% - are also percentiles like median
etc.
Depending on your skills set you can check i.e. Calculator.java class code to see how JMeter calculates averages, percentiles, throughput, etc. and implement some form of postprocessor, use MS Excel, LibreOffice Calc or equivalent on .jtl CSV results file.
If you need to get these results after JMeter run the easiest option are:
Vanilla Jmeter:
if you launch JMeter via Ant Task or Maven Plugin - you'll get HTML results file like:
For more information on configuring Ant and/or Maven integration refer above links or Five Ways To Launch a JMeter Test without Using the JMeter GUI guide.
Using JMeter plugins:
Console Status Logger - which prints quick stats information to stdout and jmeter.log file
0 Threads: 27/5000 Samples: 1 Latency: 5 Resp.Time: 5 Errors: 0%
1 Threads: 2350/5000 Samples: 142 Latency: 19 Resp.Time: 19 Errors: 0%
2 Threads: 4500/5000 Samples: 130 Latency: 51 Resp.Time: 51 Errors: 0%
3 Threads: 5000/5000 Samples: 153 Latency: 81 Resp.Time: 81 Errors: 0%
Loadosophia.org Uploader - which uploads your test results to Loadosophia.org cloud service where you can perform analysis, see graphs, charts, export report as PDF, etc.