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exec: Program file does not exist; file exists, but does represent a valid executable file (e.g., it is a spreadsheet); file exists, but the user does not have permission to execute it (e.g., the file does not have the exec bit set, or the user does not have permission to access the file unlink: File does not exist; user does not have permission to access the file. fork: No more processes (OS out of memory).

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Q: For each what system calls give a condition that causes it to fail fork exec and unlink?
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