Statistics from the command line!
Staccato (st for short) is a command line program that lets you compute
statistics from values from a file or standard input. It computes things
about the stream of numbers like min, max, mean, median, and standard
deviation. It can also compute these things about some subset of the stream,
for example the lower 95% of values.
Lots of em! Better examples coming soon!
For now, the only way to install Staccato is from source, using Cargo:
git clone https://github.com/tshlabs/staccato.git && cd staccato
cargo install
st --help
Better installation and docs coming soon!
Some examples of how to use Staccato are given below. Note that these
examples assume you are familiar with standard Unix command line tools
like awk, cut, and tail.
The most obvious use case for Staccato is when you already have a file
full of numbers and you want to know things about them. For example, imagine
you have a file called timings.log that looks like this:
0.572124
0.623724
1.043369
0.563586
1.603538
0.540765
1.677319
0.170808
0.147564
To get statistics about those values, you'd run Staccato like this:
$ st timings.log
count: 9
sum: 6.94279
mean: 0.77142
upper: 1.67731
lower: 0.14756
median: 0.57212
stddev: 0.52650
Another good use of Staccato is to compute the statistics from some
particular field or value being written to a log file. Imagine that
you have an access log called access.log for your web application
that looks something like the following:
2016-08-29T02:14:32 GET /some-url-path/?foo=bar 200 3.84639
... where the fields in this log represent:
$TIMESTAMP $HTTP_METHOD $REQUEST_URL $HTTP_RESPONSE $RESPONSE_TIME_IN_MS
To get statistics about the most recent 100 response times for your application, you might use Staccato like this:
$ tail -n 100 /var/log/my-application/access.log | cut -d ' ' -f 5 | st
count: 100
mean: 0.20346
upper: 3.84639
lower: 0.00577
median: 0.02101
stddev: 0.60871
Coming soon!
The source code is available on GitHub at https://github.com/tshlabs/staccato
Release notes for Staccato can be found in the CHANGES.md file.
Staccato uses Cargo for performing various development tasks.
To build Staccato:
$ cargo build
To run tests:
$ cargo test
To run benchmarks:
$ cargo bench
To build documentation:
$ cargo doc
Staccato is available under the terms of the GPL, version 3.
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you shall be licensed as above, without any additional terms or conditions.