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Filter stdin to avoid excessive output

Project description


This is the README file for zenfilter.


Shlomi Fish <>



This small script filters long STDIN output, performing several functions to keep track of the important parts and progresses, which will be hard to do with a shell script.

It is useful for filtering the output of verbose Travis-CI ( ) commands, but may be useful in other contexts where there is a limit to the amount of kept output.

All arguments are optional:

  • –count-step=n: displays COUNT <tab> <step> every n lines.

  • –last=n: displays the last n lines prefixed with “LASTt”

  • –filter=<regex pattern>: displays matching lines with a “FOUNDt” prefix.

  • –suppress-last-on=<regex>: suppress the last lines if their concatenated output matches the regex.


python --count-step=10 --last=200 --filter="[0-9]+"
python --last=20
python --last=25 --count-step=15

A use case scenario:

make 2>&1 | python [args]

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