When the command echo $? outputs 1, which of the following statements are true?
A. It is the process ID of the echo command.
B. It is the process ID of the current shell.
C. It is the exit value of the command executed immediately before echo.
D. It is the exit value of the echo command.
When the command echo $? outputs 1, which of the following statements are true?
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answerhappygod
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When the command echo $? outputs 1, which of the following statements are true?
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