CWD of an Node.js application started with upstart (Ubuntu) -

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i've coded node.js app when executed need return cwd process able read files on disk.

when start app directly node in actual app directory... 

 #!sh  node app.js

everything working fine , "process.cwd()" return path. when script started upstart or directly node other directory "process.cwd()" return "/" in case of upstart , whatever directory witch directly start app node. process.cwd() seem output directory witch command executed. why? do?

node.js provides global variable "__dirname" provide actual path of application.


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