A terminal-only version of Sumo written in Go

go get



Join the chat at

Sumoshell is collection of utilities to improve analyzing log files written in Go. grep can't tell that some log lines span multiple individual lines. Parsing out fields is cumbersome. Aggregating is basically impossible, and there is no good way to view the results. In Sumoshell, each individual command acts as a phase in a pipeline to get the answer you want. Sumoshell brings a lot of the functionality of Sumo Logic to the command line.

Commands should start with sumo search [filter] which will transform logs into the json format sumoshell uses. Commands should end with render or graph which render the output to the terminal. Each operator is a stand-alone binary allowing them to be easily composed.


OSX and Linux binaries are provided for sumoshell. Simply extract the archive and place the binaries on your path.

If you run a different OS or would prefer to install from source, it's easy to build from source. Given a working go installation, run:

go get
cd $GOPATH/src/ # Will warn about `no buildable go source`
go get ./...
go install ./...


Like SumoLogic, sumoshell enables you pass log data through a series of transformations to get your final result. Pipelines start with a source (tail, cat, etc.) followed by the sumo operator. An example pipeline might be:

tail -f logfile | sumo search "ERROR" | sumo parse "thread=*]" | sumo count thread | render

This would produce a count of log messages matching ERROR by thead. In the basic renderer, the output would look like:

_Id   _count   thread   
0     4        C        
1     4        A        
2     1        B      

The sumo search operator

sumo search takes an optional filter parameter to allow for basic searching. The sumo operator performs 3 steps:

  1. Break a text file into logical log messages. This merges things like stack traces into a single message for easy searching.
  2. Allow basic searching.
  3. Transforms the log message into the sumoshell internal json format.

Displaying results

After using the sumo operator, the output will be in JSON. To re-render the output in a human-readable form, | the results of your query into one of the three render operators.

  1. render: Capable of rendering aggregate and non-aggregate data.
  • Add nowraw to drop the raw data when an aggregate isn't present.
  • Aggregates are updated in place using terminal escape sequences, with a limit of 20 shown. Add all to remove the limit. Aggregates will be rendered when the stream ends (ctrl+c)
  1. graph: Curses based renderer for rendering tabular data as a bar chart.

Parsing Data

sumoshell supports a basic parse operator similar to the parse operator in SumoLogic. Queries take the form:

... | sumo parse "[pattern=*] pattern2:'*' morePatterns=(*)" as pattern, pattern2, more | ...

Filtering Data

sumoshell supports a filter operator similar to the where operator in SumoLogic. Queries take the form:

... | sumo parse "[host=*]" as host | sumo filter host = server1 

This will drop any log lines that don't have server1 as the host.

Aggregating Data

sumoshell currently supports 3 aggregate operators:

  1. count Example queries:
... | sumo count           # number of rows
... | sumo count key       # number of rows per key
... | sumo count key value # number of rows per the cartesian product of (key, value)

  1. sum Example queries:
... | sumo sum k      # sum of all k's
... | sumo sum v by k # sum of all v's by k

  1. average Example queries:
... | sumo average k      # average of all k's
... | sumo average v by k # average of all v's by k