Command to wait for specified number of seconds before exit
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wait
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sleep
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pause
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None of the above
B
Correct answer
Explanation
The 'sleep' command in Unix/Linux pauses execution for a specified number of seconds. 'wait' is used to wait for background processes to complete, and 'pause' is not a standard Unix command (though it exists in Windows). The syntax is typically 'sleep N' where N is the number of seconds.