AT command
rf926_at_hotmail.com
Date: 05/31/04
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Date: Sun, 30 May 2004 18:36:56 -0700
AtSchedules commands and programs to run on a computer at
a specified time and date. You can use at only when the
Schedule service is running. Used without parameters, at
lists scheduled commands.
Syntax
at [\\ComputerName] [{[ID] [/delete] | /delete [/yes]}]
at [[\\ComputerName] Hours:Minutes [/interactive]
[{/every:Date[,...] | /next:Date[,...]}] Command]
Parameters
\\ComputerName
Specifies a remote computer. If you omit this parameter,
at schedules the commands and programs on the local
computer.
ID
Specifies the identification number assigned to a
scheduled command.
/delete
Cancels a scheduled command. If you omit ID, all of the
scheduled commands on the computer are canceled.
/yes
Answers yes to all queries from the system when you delete
scheduled events.
Hours:Minutes
Specifies the time when you want to run the command. Time
is expressed as Hours:Minutes in 24-hour notation (that
is, 00:00 [midnight] through 23:59).
/interactive
Allows Command to interact with the desktop of the user
who is logged on at the time Command runs.
/every:
Runs Command on every specified day or days of the week or
month (for example, every Thursday, or the third day of
every month).
Date
Specifies the date when you want to run the command. You
can specify one or more days of the week (that is, type
M,T,W,Th,F,S,Su) or one or more days of the month (that
is, type 1 through 31). Separate multiple date entries
with commas. If you omit Date, at uses the current day of
the month.
/next:
Runs Command on the next occurrence of the day (for
example, next Thursday).
Command
Specifies the Windows command, program (that is, .exe
or .com file), or batch program (that is, .bat or .cmd
file) that you want to run. When the command requires a
path as an argument, use the absolute path (that is, the
entire path beginning with the drive letter). If the
command is on a remote computer, specify Universal Naming
Convention (UNC) notation for the server and share name,
rather than a remote drive letter.
/?
Displays help at the command prompt.
Remarks
Schtasks is another command-line scheduling tool that you
can use to create and manage scheduled tasks. For more
information about schtasks, see Related Topics.
Using at
To use at, you must be a member of the local
Administrators group.
Loading Cmd.exe
At does not automatically load Cmd.exe, the command
interpreter, before running commands. If you are not
running an executable (.exe) file, you must explicitly
load Cmd.exe at the beginning of the command as follows:
cmd /c dir > c:\test.out
Viewing scheduled commands
When you use at without command-line options, scheduled
tasks appear in a table formatted similar to the following:
Status ID Day Time Command Line
OK 1 Each F 4:30 PM net send group leads
status due
OK 2 Each M 12:00 AM chkstor > check.file
OK 3 Each F 11:59 PM backup2.bat
Including identification number (ID)
When you include identification number (ID) with at at a
command prompt, information for a single entry appears in
a format similar to the following:
Task ID: 1
Status: OK
Schedule: Each F
Time of Day: 4:30 PM
Command: net send group leads status due
After you schedule a command with at, especially a command
that has command-line options, check that the command
syntax is correct by typing at without command-line
options. If the information in the Command Line column is
incorrect, delete the command and retype it. If it is
still incorrect, retype the command with fewer command-
line options.
Viewing results
Commands scheduled with at run as background processes.
Output is not displayed on the computer screen. To
redirect output to a file, use the redirection symbol (>).
If you redirect output to a file, you need to use the
escape symbol (^) before the redirection symbol, whether
you are using at at the command line or in a batch file.
For example, to redirect output to Output.text, type:
at 14:45 c:\test.bat ^>c:\output.txt
The current directory for the executing command is the
systemroot folder.
Changing system time
If you change the system time at a computer after you
schedule a command to run with at, synchronize the at
scheduler with the revised system time by typing at
without command-line options.
Storing commands
Scheduled commands are stored in the registry. As a
result, you do not lose scheduled tasks if you restart the
Schedule service.
Connecting to network drives
Do not use a redirected drive for scheduled jobs that
access the network. The Schedule service might not be able
to access the redirected drive, or the redirected drive
might not be present if a different user is logged on at
the time the scheduled task runs. Instead, use UNC paths
for scheduled jobs. For example:
at 1:00pm my_backup \\server\share
Do not use the following syntax, where x: is a connection
made by the user:
at 1:00pm my_backup x:
If you schedule an at command that uses a drive letter to
connect to a shared directory, include an at command to
disconnect the drive when you are finished using the
drive. If the drive is not disconnected, the assigned
drive letter is not available at the command prompt.
Tasks stopping after 72 hours
By default, tasks scheduled using the at command stop
after 72 hours. You can modify the registry to change this
default value.
Start Registry Editor (regedit.exe).
Locate and click the following key in the registry:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Schedu
le
On the Edit menu, click Add Value, and then add the
following registry value: Value Name: AtTaskMaxHours Data
type: REG_DWORD Radix: Decimal Value Data: 0. A value of 0
in the value data field indicates no limit, does not stop.
Values from 1 through 99 indicates the number of hours.
Caution
Incorrectly editing the registry may severely damage your
system. Before making changes to the registry, you should
back up any valued data on the computer.
Task Scheduler and the at command
You can use the Scheduled Tasks folder to view or modify
the settings of a task that was created by using the at
command. When you schedule a task using the at command,
the task is listed in the Scheduled Tasks folder, with a
name such as the following:At3478. However, if you modify
an at task through the Scheduled Tasks folder, it is
upgraded to a normal scheduled task. The task is no longer
visible to the at command, and the at account setting no
longer applies to it. You must explicitly enter a user
account and password for the task.
Examples
To display a list of commands scheduled on the Marketing
server, type:
at \\marketing
To learn more about a command with the identification
number 3 on the Corp server, type:
at \\corp 3
To schedule a net share command to run on the Corp server
at 8:00 A.M. and redirect the listing to the Maintenance
server, in the Reports shared directory, and the Corp.txt
file, type:
at \\corp 08:00 cmd /c "net share
reports=d:\marketing\reports >>
\\maintenance\reports\corp.txt"
To back up the hard drive of the Marketing server to a
tape drive at midnight every five days, create a batch
program called Archive.cmd, which contains the backup
commands, and then schedule the batch program to run, type:
at \\marketing 00:00 /every:5,10,15,20,25,30 archive
To cancel all commands scheduled on the current server,
clear the at schedule information as follows:
at /delete
To run a command that is not an executable (that is, .exe)
file, precede the command with cmd /c to load Cmd.exe as
follows:
cmd /c dir > c:\test.out
Formatting legend
Format Meaning
Italic Information that the user must supply
Bold Elements that the user must type exactly as shown
Ellipsis (...) Parameter that can be repeated several
times in a command line
Between brackets ([]) Optional items
Between braces ({}); choices separated by pipe (|).
Example: {even|odd} Set of choices from which the user
must choose only one
Courier font Code or program output
>-----Original Message-----
>Hello
>
>Windows Server 2000 SP4.
>
>How cand I schedule a task for a precise date using AT
>command. For example: launch a prog.exe at 10am on 7
>July 2004.
>
>Many thanks
>
>Pedro
>.
>
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