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Which command is used by the system administrator to set the date of the system?

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Which command is used by the system administrator to set the date of the system?

(a) dt

(b) su

(c) date

(d) chdt

This question was addressed to me by my college director while I was bunking the class.

Query is from Administrator Specific Commands and Privileges topic in section Essential Shell Programming of Unix

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Right option is (c) date

For explanation I would say: date command is used by users for displaying the system date. Same command is used by the system administrator to change/set the system date. The argument is an eight-character string of the form MMDDhhmm. For example,

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