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____ option is used for checking whether a particular file is older than a specified file.

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____ option is used for checking whether a particular file is older than a specified file.

(a) -ef

(b) -old

(c) -nt

(d) -ot

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My question comes from Using test and [ ] to Evaluate Expressions in portion Essential Shell Programming of Unix

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Right option is (d) -ot

Easiest explanation: If we have two file namely file01 and file02 and we want to check if file01 is older than file02, we have to use -ot option with test. The syntax is file01 -ot  file02. Similarly, to check whether file01 is newer than file02 we’ve to use -nt option. These commands work in korn and bash shell only.

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