AT
Section: User Commands (1)
Index
Return to Main Contents
NAME
at - execute commands at a later time
SYNOPSIS
at
time
[
day
]
[
file
]
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(1)
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 user and group ID
of the creator of the copy file.
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
(1) a month name followed by a day number,
or
(2) 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.
Examples of legitimate commands are
-
at 8am jan 24
at 1530 fr week
At
programs are executed by periodic execution
of the command
/usr/lib/atrun
from
cron(8).
The granularity of
at
depends upon how often
atrun
is executed.
Standard output or error output is lost unless redirected.
FILES
/usr/spool/at/yy.ddd.hhhh.uu
activity to be performed at hour
hhhh
of year day
ddd
of year
yy.
uu
is a unique number.
/usr/spool/at/lasttimedone contains
hhhh
for last hour of activity.
/usr/spool/at/past directory of activities now in progress
/usr/lib/atrun program that executes activities that
are due
pwd(1)
SEE ALSO
calendar(1),
cron(8)
DIAGNOSTICS
Complains about various syntax errors and times out of range.
BUGS
Due to the granularity of the execution of
/usr/lib/atrun,
there may be bugs in scheduling things almost
exactly 24 hours into the future.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- FILES
-
- SEE ALSO
-
- DIAGNOSTICS
-
- BUGS
-
This document was created by
man2html,
using the manual pages.
Time: 10:16:26 GMT, December 28, 2024