1. at
depend on atd service, can execute task only once
the command will be auto create task file in /var/spool/at directory, the command permission relies on /etc/at.allow and /etc/at.deny files, at.allow will override at.deny file when configuration crashed
at -l : equals to atq command, can query current task list
at -d : equals to atrm command, can delete designate task
at -c : show at command detail
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