run-js-on-input

This is a node.js based command line utility to process bash style line input using JavaScript. The script can be provided directly as a command line parameter or as a script file. Each input line will be provided as a JSON object named input to the custom script.

Installation

npm install

or

npm install -g

Usage

Usage: run-js-on-input [options] [script]

Run JavaScript line by line on input data. Each line will be available as "input" variable.

Options:
  -V, --version                  output the version number
  -f, --file <file>              input data file (default stdin)
  -s, --scriptFile <scriptFile>  JavaScript file
  -h, --help  

Examples

with input from stdin:

>> echo "This is a test!" | run-js-on-input "console.log(input.toUpperCase())"
THIS IS A TEST!

with script file and input from stdin

Using sample JavaScript file sample.js:

>> cat sample.js | run-js-on-input -s sample.js
1 // context is an empty object provided to the script.
2 (context.i)? context.i++: context.i=1;
3
4 // Print out line number and line
5 console.log(context.i, input);

with script file & input file:

Using sample JavaScript file sample.js:

>> run-js-on-input -s sample.js -f sample.js
1 // context is an empty object provided to the script.
2 (context.i)? context.i++: context.i=1;
3
4 // Print out line number and line
5 console.log(context.i, input);