The issue you're hitting is that the --outfile flag isn't designed to handle special streams like /dev/stdout directly. Instead, the Highcharts Export Server CLI includes a dedicated --stdout flag specifically for streaming the generated chart image to standard output.

Here's the correct command to achieve what you want:

highcharts-export-server --infile ./chart_options.json --stdout

This will send the raw image data directly to stdout. If you want to capture this output into a file (as a replacement for your original --outfile usage), you can pipe it like this:

highcharts-export-server --infile ./chart_options.json --stdout > ./chart.png

The --stdout flag works cross-platform (including Windows, where /dev/stdout doesn't exist), making it a more reliable choice than trying to target stdout via --outfile.

内容的提问来源于stack exchange，提问作者Francesco Meli