Reference: at
Author: Daniel Gilly & the Staff of O'Reilly & Associates
Date: 1998-08-06T21:52:14Z

#

| Chapter 2 UNIX Commands |

## at

    at options1 time [date] [+ increment]
    at options2 [jobs]

Execute commands entered on standard input at a specified `time` and optional `date`. (See also batch.) End input with `EOF`. `time` can be formed either as a numeric hour (with optional minutes and modifiers) or as a keyword. `date` can be formed either as a month and date, as a day of the week, or as a special keyword. `increment` is a positive integer followed by a keyword. See below for details.

### Options1

-f `file`

  Execute commands listed in `file`.

-m

  Send mail to user after job is completed.

### Options2

-l

  Report all jobs that are scheduled for the invoking user or, if `jobs` are specified, report only for those. See also atq.

-r

  Remove specified `jobs` that were previously scheduled. To remove a job, you must be a privileged user or the owner of the job. Use -l first to see the list of scheduled jobs. See also atrm.

### Time

`hh`:`mm` [`modifiers`]

  Hours can have one digit or two (a 24-hour clock is assumed by default); optional minutes can be given as one or two digits; the colon can be omitted if the format is `h`, `hh`, or `hhmm`; e.g., valid times are 5, 5:30, 0530, 19:45. If modifier am or pm is added, `time` is based on a 12-hour clock. If the keyword zulu is added, times correspond to Greenwich Mean Time.

midnight | noon | now

  Use any one of these keywords in place of a numeric time. now must be followed by an `increment`.

### Date

`month num`[, `year`]

  `month` is one of the 12 months, spelled out or abbreviated to their first three letters; `num` is the calendar date of the month; `year` is the four-digit year. If the given `month` occurs before the current month, at schedules that month next year.

`day`

  One of the seven days of the week, spelled out or abbreviated to their first three letters.

today | tomorrow

  Indicate the current day or the next day. If `date` is omitted, at schedules today when the specified `time` occurs later than the current time; otherwise, at schedules tomorrow.

### Increment

Supply a numeric increment if you want to specify an execution time or day `relative` to the current time. The number should precede any of the keywords minute, hour, day, week, month, or year (or their plural forms). The keyword next can be used as a synonym of + 1.

### Examples

Note that the first two commands are equivalent:

>     at 1945 pm December 9
>     at 7:45pm Dec 9
>     at 3 am Saturday
>     at now + 5 hours
>     at noon next day

Reference: as |  | Reference: atq