The commands described below need to be entered while logged in to the Unix server. Normally you'll see a prompt ending with $ when the command interpreter (or shell) is ready for another command.
Run the command
ls
in your directory. Check the spelling of the file name and whether it is in upper- or lowercase or even a mixture of both. UNIX is case sensitive and names must be typed correctly.
Check also whether the access permissions on the file are correct, using the command
ls -l
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