UNIX Shells by Example (4th Edition)

at , batch ”executes commands at a later time

at [csm] [f script] [qqueue] time [date] [+ increment] at l [ job...] at r job... batch

at and batch read commands from standard input to be executed at a later time. at allows you to specify when the commands should be executed, whereas jobs queued with batch will execute when system load level permits . Executes commands read from stdin or a file at some later time. Unless redirected, the output is mailed to the user .

Example A.3.

1 at 6:30am Dec 12 < program 2 at noon tomorrow < program 3 at 1945 pm August 9 < program 4 at now + 3 hours < program 5 at 8:30am Jan 4 < program 6 at -r 83883555320.a

EXPLANATION

1. At 6:30 in the morning on December 12, start the job.

2. At noon tomorrow start the job.

3. At 7:45 in the evening on August 9, start the job.

4. In three hours start the job.

5. At 8:30 in the morning on January 4, start the job.

6. Removes previously scheduled job 83883555320.a.