Update README

README.md

@@ -21,23 +21,42 @@ $ go get github.com/tsenart/vegeta
 $ go install github.com/tsenart/vegeta
 ```
 
-## Usage (CLI)
+## Usage examples
+```shell
+$ echo "GET http://localhost/" | vegeta attack -rate=100 -duration=5s | vegeta report
+$ vegeta attack -targets=targets.txt > results.vr
+$ vegeta report -input=results.vr -reporter=json > metrics.json
+$ vegeta report -input=results.vr -reporter=plot:timings > plot.svg
+```
+
+## Usage manual
 ```shell
 $ vegeta -h
-Usage of vegeta:
-  -cpus=n: Number of CPUs to use
-  -duration=10s: Duration of the test
-  -ordering="random": Attack ordering [sequential, random]
-  -output="stdout": Reporter output file
-  -rate=50: Requests per second
-  -reporter="text": Reporter to use [text, json, plot:timings]
-  -targets="targets.txt": Targets file
+Usage: vegeta [globals] <command> [options]
+
+Commands:
+  attack  Hit the targets
+  report  Report the results
+
+Globals:
+  -cpus=8 Number of CPUs to use
 ```
 
 #### -cpus
 Specifies the number of CPUs to be used internally.
 It defaults to the amount of CPUs available in the system.
 
+### attack
+```shell
+$ vegeta attack -h
+Usage of attack:
+  -duration=10s: Duration of the test
+  -ordering="random": Attack ordering [sequential, random]
+  -output="stdout": Output file
+  -rate=50: Requests per second
+  -targets="stdin": Targets file
+```
+
 #### -duration
 Specifies the amount of time to issue request to the targets.
 The internal concurrency structure's setup has this value as a variable.
@@ -52,18 +71,44 @@ The other option is `sequential` and it does what you would expect it to
 do.
 
 #### -output
-Specifies the output file to which the report will be written to.
-The default is stdout.
+Specifies the output file to which the binary results will be written
+to. Made to be piped to the report command input. Defaults to stdout.
 
 ####  -rate
 Specifies the requests per second rate to issue against
 the targets. The actual request rate can vary slightly due to things like
 garbage collection, but overall it should stay very close to the specified.
 
+#### -targets
+Specifies the attack targets in a line sepated file, defaulting to stdin.
+The format should be as follows.
+```
+GET http://goku:9090/path/to/dragon?item=balls
+GET http://user:password@goku:9090/path/to
+HEAD http://goku:9090/path/to/success
+...
+```
+
+### report
+```
+$ vegeta report -h
+Usage of report:
+  -input="stdin": Input file
+  -output="stdout": Output file
+  -reporter="text": Reporter [text, json, plot:timings]
+```
+
+#### -input
+Specifies the input file from which the attack command binary results
+are saved. Defaults to stdin.
+
+#### -output
+Specifies the output file to which the report will be written to.
+
 #### -reporter
-Specifies the reporting type to display the results with.
-The default is the text report printed to stdout.
-##### -reporter=text
+Specifies the kind of report to be generated. It defaults to text.
+
+##### text
 ```
 Time(avg)	Requests	Success		Bytes(rx/tx)
 152.341ms	200		    17.00%		251.00/0.00
@@ -75,7 +120,7 @@ Error Set:
 Server Timeout
 Page Not Found
 ```
-##### -reporter=json
+##### json
 ```json
 {
   "total_requests": 50,
@@ -93,19 +138,9 @@ Page Not Found
   "errors": []
 }
 ```
-##### -reporter=plot:timings
-Plots the request timings in SVG format.
+##### plot:timings
 ![plot](https://dl.dropboxusercontent.com/u/83217940/plot.svg)
 
-#### -targets
-Specifies the attack targets in a line sepated file. The format should
-be as follows:
-```
-GET http://goku:9090/path/to/dragon?item=balls
-GET http://user:password@goku:9090/path/to
-HEAD http://goku:9090/path/to/success
-...
-```
 
 ## Usage (Library)
 ```go