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Shellot

Slim terminal realtime graphing tool

Translates some typical "tail -f" cases into realtime graphs

For example, if you're able to create a continuous output of status codes like this:

$ ssh webserver.mydomain.com "tail -f /var/log/httpd/access_log"\
     | awk '/ "GET \/index.html / {print $9;fflush();}'
200
200
200
302
200
404
200
...

just pipe shellot at the end of command line and shellot will draw something like:

where every second it will plot how many events of each key it got

More info:

./shellot --help

How to install

  • fetch the one ruby file "shellot" from github to your laptop or any server
  • add execution permission: chmod +x shellot
  • test count of two events happening in random times:
for i in {1..10000}; do echo event$[($RANDOM % 2)]; sleep .001; done | ./shellot
  • test average of random milliseconds:
for i in {1..10000}; do echo ms=$[($RANDOM % 20)]; sleep .001; done | ./shellot -a

Requirements

  • ruby >= 1.8, no gem dependencies. This means, almost any Linux/Mac

License

Copyright (c) 2013, Groupon, Inc.
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.

Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.

Neither the name of GROUPON nor the names of its contributors may be
used to endorse or promote products derived from this software without
specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Tests

In Ruby 1.8 and Ruby 1.9:

./shellot --test
./shellot --help
for i in {1..10000}; do echo event$[($RANDOM % 2)]; sleep .001; done | ./shellot
for i in {1..10000}; do echo ms=$[($RANDOM % 20)]; sleep .001; done | ./shellot -a

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Slim terminal realtime graphing tool

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