Question

我试图使用nohup命令通过ssh运行phantomjs脚本。但是nohup引发了一个我在nohup.out文件中找到的错误。

我的命令是 - ＆gt;

nohup phantomjs example.js &

phantomjs example.js在没有nohup的情况下完美运行。我还创建了一个bash脚本来运行nohup这个命令，但是两次都得到了这个错误 - ＆gt;

events.js:72
        throw er; // Unhandled 'error' event
              ^
Error: EBADF, read

** example.js的代码

var page = require('webpage').create(),
    system = require('system'),
    address, output, size;

if (system.args.length < 3 || system.args.length > 5) {
    console.log('Usage: rasterize.js URL filename [paperwidth*paperheight|paperformat] [zoom]');
    console.log('  paper (pdf output) examples: "5in*7.5in", "10cm*20cm", "A4", "Letter"');
    console.log('  image (png/jpg output) examples: "1920px" entire page, window width 1920px');
    console.log('                                   "800px*600px" window, clipped to 800x600');
    phantom.exit(1);
} else {
    address = system.args[1];
    output = system.args[2];
    page.viewportSize = { width: 600, height: 600 };
    if (system.args.length > 3 && system.args[2].substr(-4) === ".pdf") {
        size = system.args[3].split('*');
        page.paperSize = size.length === 2 ? { width: size[0], height: size[1], margin: '0px' }
                                           : { format: system.args[3], orientation: 'portrait', margin: '1cm' };
    } else if (system.args.length > 3 && system.args[3].substr(-2) === "px") {
        size = system.args[3].split('*');
        if (size.length === 2) {
            pageWidth = parseInt(size[0], 10);
            pageHeight = parseInt(size[1], 10);
            page.viewportSize = { width: pageWidth, height: pageHeight };
            page.clipRect = { top: 0, left: 0, width: pageWidth, height: pageHeight };
        } else {
            console.log("size:", system.args[3]);
            pageWidth = parseInt(system.args[3], 10);
            pageHeight = parseInt(pageWidth * 3/4, 10); // it's as good an assumption as any
            console.log ("pageHeight:",pageHeight);
            page.viewportSize = { width: pageWidth, height: pageHeight };
        }
    }
    if (system.args.length > 4) {
        page.zoomFactor = system.args[4];
    }
    page.open(address, function (status) {
        if (status !== 'success') {
            console.log('Unable to load the address!');
            phantom.exit();
        } else {
            window.setTimeout(function () {
                page.render(output);
                phantom.exit();
            }, 200);
        }
    });
}

Answer 1

与1.9.8和casperjs 1.1.0-beta3有同样的问题。我需要让这个过程在后台进行转换，所以不是nohup-ing我所做的是启动并分离过程：

<Ctrl+Z>
bg
disown %1

Answer 2

似乎phanomjs需要输入，这很有效：

phantomjs script.js > log 2>&1 < /dev/null &

与nohup无法合作的幻影

2 个答案: