AT(1) AT(1)
NAME
at - execute commands at a later time
SYNOPSIS
at [ -r ] time [ day ] [ file ]
at -l
DESCRIPTION
At squirrels away a copy of the named file (standard input
default) to be used as input to sh(1) at a specified later
time. A cd command to the current directory is inserted at
the beginning, followed by assignments to all environment
variables. When the script is run, it uses the userid and
groupid of the creator of the copy.
The time is 1 to 4 digits, with an optional following `A',
`P', `N' or `M' for AM, PM, noon or midnight. One and two
digit numbers are taken to be hours, three and four digits
to be hours and minutes. If no letters follow the digits, a
24 hour clock time is understood.
The optional day is either a month name followed by a day
number, or a day of the week; if the word `week' follows,
invocation is moved seven days further off. Names of months
and days may be recognizably truncated. A year number,
spelled out in full, may follow the month.
The options are
-r Remove the specified activity.
-l List all activities scheduled for this user.
At programs are executed by periodic execution of from
cron(8). The granularity of at depends upon how often atrun
is executed.
The standard output and standard error files are lost unless
redirected.
EXAMPLES
at 0800 dec 24
echo ho ho ho | mail claus
at -r `at -l`
Remove a scheduled activity.
FILES
the future.