Answer :
The command which removes a job at the queue is atrm at -d
What is the use of atrm at -d ?
To remove the specified jobs, use the atrm command. The job number is passed into the command to remove it. A user can only delete jobs that are his. Only the superuser has the ability to delete any job, even if it belongs to another user.
The atrm command deletes jobs created with the at command. If you specify one or more job numbers, the atrm command will attempt to remove only those jobs. If one or more user names are specified, all jobs associated with those users are deleted.
Thus we can say that the atrm command is used to remove a job at the queue
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