这是显示的堆栈跟踪：
$ /tmp/node_modules/jpm-mobile/bin/jpm-mobile init
/tmp/node_modules/jpm-mobile/bin/jpm-mobile:50
if (cmd.isEmptyCommand(program)) {
^
ReferenceError: cmd is not defined
at Object.<anonymous> (/tmp/node_modules/jpm-mobile/bin/jpm-mobile:50:5)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Function.Module.runMain (module.js:497:10)
at startup (node.js:119:16)
at node.js:902:3
npm list显示已安装jpm-mobile。