gistfile1.txt

function bash readData() {{
    cat ~/data.txt
}}

function python prefixLines(prefix) {{
    import sys
    return [prefix + line for line in sys.argv]
}}

function javascript output() {{
    process.stdin.on('data', data => {
        console.log(`${data.toString()}`);
        process.exit();
    });
}}

readData() | prefixLines("data: ") | output()


bash {{
    cat ~/data.txt
}} | python (prefix) {{
    import sys
    return [prefix + line for line in sys.argv]
}} | javascript {{
    process.stdin.on('data', data => {
        console.log(`${data.toString()}`);
        process.exit();
    });
}}