To schedule a job to run once at a particular time, use command at time_to_run, for example, to run at 8:40 am:
Then type-in commands and finish with ^D
Time format examples:
To run an executable file or a script:
Command at puts a scheduled job in a queue in /var/spool/at/; daemon /usr/sbin/atd checks for queued jobs in that directory and runs them.
To check scheduled job status, run
To delete scheduled job, run
Permssions on using at: