tools.js

#!/usr/bin/env node

var input = process.argv[2];
var keyword = process.argv[3];
var output = process.argv[4];

var fs = require('fs');

var rs = fs.createReadStream(input, {
    flags: 'r',
    encoding: 'utf-8'
});

var ws = fs.createWriteStream(output, {
    flags: 'w+',
    encoding: 'utf-8'
});

var matched = false;
var CRLF = '\r\n';
var prevline = '';

rs.on('data', function (chunk) {
    var lines = chunk.split(CRLF);
    lines[0] = prevline + lines[0];
    if (chunk.substr(chunk.length - 2) !== CRLF) {
        prevline = lines.pop();
    } else {
        prevline = '';
    }

    lines.forEach(function (line) {
        if (line.indexOf(keyword) !== -1) {
            ws.write(line + CRLF);
        }
    });
});

rs.on('end', function () {
    ws.end(function () {
        console.log('done');
    });
});

点赞!

用 child_process 调用 cat grep 更快 我无聊写了个 哈哈