Malformed url exception linux local file system

I have been trying to execute a selenium.attachFile command to upload a file开发者_运维百科-

sel.attachFile(dom_locator,"/home/xyz/Desktop/tstfl.txt");

but getting a Malformed URL Exception for the file path specified. The file is present in the linux local file system. Please help me with the proper format of the file path.

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Likely what you need is

sel.attachFile(dom_locator,"file:///home/xyz/Desktop/tstfl.txt");

For an explanation of file uris, see File URI scheme in wikipedia.