-a Change the access time of file. Do not change the modification time unless -m is also specified.
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-c Do not create a specified file if it does not exist. Do not write any diagnostic messages
concerning this condition.
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-m Change the modification time of file. Do not change the access time unless -a is also specified.
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-r ref_file
Use the corresponding time of the file named by the pathname ref_file instead of the current time.
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-t time
Use the specified time instead of the current time. The option-argument shall be a decimal number
of the form:
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