Plot values from stdin directly in your terminal
npm install cli-plotPlot values from stdin directly into your terminal.
``
npm install -g cli-plot
Say you have the following shell script that outputs numbers on stdout:
`bash`
for i in {1..50}; do
echo $RANDOM;
sleep 1;
done
Or the following Node program that outputs a sine wave:
`js`
var i = 0;
setInterval(function() {
var value = Math.sin(i += 0.2);
process.stdout.write(value + '\n');
}, 100);
You can pipe it into plot to generate a chart right there in your terminal.
It will push new values from the right every time they arrive on stdin.
Note: input values must be separated by a new line.
`bash`
node sine.js | plot
- plot -w 100: graph width (in terminal rows)plot -h 10
- : graph height (in terminal rows)
- Printing averages
If the input program outputs numbers very often, the chart will probably move too fast.
You can pipe the output into a tool like cli-average.
`bash`
./random.sh | avg -t 1s | plot
- Watching the output of another program
One common usage is to run a command at a given rate, and plot its results.
Unfortunately, the watch command also outputs debug info and ANSI escape codes,plot
which doesn't play well with . You'll need to use different way to watch that command,
for example cli-interval.
`bash`
interval -t 1s "echo $RANDOM" | plot
- Getting values from JSON documents
The easiest way is to use tools like json or jQ.
`bash``
some_program | json "path.to.value" | plot