Интерактивная система просмотра системных руководств (man-ов)
atrm (1)
atrm (1) ( Solaris man: Команды и прикладные программы пользовательского уровня )
>> atrm (1) ( FreeBSD man: Команды и прикладные программы пользовательского уровня )
atrm (1) ( Русские man: Команды и прикладные программы пользовательского уровня )
atrm (1) ( Linux man: Команды и прикладные программы пользовательского уровня )
BSD mandoc
NAME
atbatchatqatrm
- queue, examine or delete jobs for later execution
SYNOPSIS
at
[-q queue
]
[-f file
]
[-mldbv
]
time at
[-q queue
]
[-f file
]
[-mldbv
]
-t
[[CC YY
]
]
MM DD hh mm [. SS
]
at
-c job [job ...
]
at
-l [job ...
]
at
-l
-q queue at
-r job [job ...
]
atq
[-q queue
]
[-v
]
atrmjob
[job ...
]
batch
[-q queue
]
[-f file
]
[-mv
]
[time
]
DESCRIPTION
The
at
and
batch
utilities
read commands from standard input or a specified file which are to
be executed at a later time, using
sh(1).
at
executes commands at a specified time;
atq
lists the user's pending jobs, unless the user is the superuser; in that
case, everybody's jobs are listed;
atrm
deletes jobs;
batch
executes commands when system load levels permit; in other words, when the load average
drops below 1.5, or the value specified in the invocation of
atrun
The
at
utility allows some moderately complex
time
specifications.
It accepts times of the form
HHMM
or
HH:MM
to run a job at a specific time of day.
(If that time is already past, the next day is assumed.)
As an alternative, the following keywords may be specified:
midnightnoon
or
teatime
(4pm)
and time-of-day may be suffixed with
AM
or
PM
for running in the morning or the evening.
The day on which the job is to be run may also be specified
by giving a date in the form
month-name day
with an optional
year
or giving a date of the forms
DD.MM.YYYYDD.MM.YYMM/DD/YYYYMM/DD/YYMMDDYYYY , orMMDDYY
The specification of a date must follow the specification of
the time of day.
Time can also be specified as:
[now
]
+ count time-units
where the time-units can be
minuteshoursdaysweeksmonths
or
years
and
at
may be told to run the job today by suffixing the time with
today
and to run the job tomorrow by suffixing the time with
tomorrow
For example, to run a job at 4pm three days from now, use
at 4pm + 3 days
to run a job at 10:00am on July 31, use
at 10am Jul 31
and to run a job at 1am tomorrow, use
at 1am tomorrow
The
at
utility also supports the
POSIX
time format (see
-t
option).
For both
at
and
batch
commands are read from standard input or the file specified
with the
-f
option and executed.
The working directory, the environment (except for the variables
TERMTERMCAPDISPLAY
and
_
and the
umask
are retained from the time of invocation.
An
at
or
batch
command invoked from a
su(1)
shell will retain the current userid.
The user will be mailed standard error and standard output from his
commands, if any.
Mail will be sent using the command
sendmail(8).
If
at
is executed from a
su(1)
shell, the owner of the login shell will receive the mail.
The superuser may use these commands in any case.
For other users, permission to use
at
is determined by the files
/var/at/at.allow
and
/var/at/at.deny
If the file
/var/at/at.allow
exists, only usernames mentioned in it are allowed to use
.
In these two files, a user is considered to be listed only if the user
name has no blank or other characters before it on its line and a
newline character immediately after the name, even at the end of
the file.
Other lines are ignored and may be used for comments.
If
/var/at/at.allow
does not exist,
/var/at/at.deny
is checked, every username not mentioned in it is then allowed
to use
.
If neither exists, only the superuser is allowed use of
.
This is the default configuration.
IMPLEMENTATION NOTES
Note that
at
is implemented through the
cron(8)
daemon by calling
atrun(8)
every five minutes.
This implies that the granularity of
at
might not be optimal for every deployment.
If a finer granularity is needed, the system crontab at
/etc/crontab
needs to be changed.
OPTIONS
-q queue
Use the specified queue.
A queue designation consists of a single letter; valid queue designations
range from
a
to
z
and
A
to
Z
The
c
queue is the default for
at
and the
E
queue for
batch
Queues with higher letters run with increased niceness.
If a job is submitted to a queue designated with an uppercase letter, it
is treated as if it had been submitted to batch at that time.
If
atq
is given a specific queue, it will only show jobs pending in that queue.
-m
Send mail to the user when the job has completed even if there was no
output.
-f file
Read the job from
file
rather than standard input.
-l
With no arguments, list all jobs for the invoking user.
If one or more
job numbers are given, list only those jobs.
-d
Is an alias for
atrm
(this option is deprecated; use
-r
instead).
-b
Is an alias for
batch
-v
For
atq
shows completed but not yet deleted jobs in the queue; otherwise
shows the time the job will be executed.
-c
Cat the jobs listed on the command line to standard output.
-r
Remove the specified jobs.
-t
Specify the job time using the Px] time format.
The argument should be in the form
[[CC YY
]
]
MM DD hh mm [. SS
]
where each pair of letters represents the following:
CC
The first two digits of the year (the century).
YY
The second two digits of the year.
MM
The month of the year, from 1 to 12.
DD
the day of the month, from 1 to 31.
hh
The hour of the day, from 0 to 23.
mm
The minute of the hour, from 0 to 59.
SS
The second of the minute, from 0 to 61.
If the
CC
and
YY
letter pairs are not specified, the values default to the current
year.
If the
SS
letter pair is not specified, the value defaults to 0.
If the file
/var/run/utmp
is not available or corrupted, or if the user is not logged on at the
time
at
is invoked, the mail is sent to the userid found
in the environment variable
LOGNAME
If that is undefined or empty, the current userid is assumed.
The
at
and
batch
utilities
as presently implemented are not suitable when users are competing for
resources.
If this is the case, another batch system such as
nqs
may be more suitable.
Specifying a date past 2038 may not work on some systems.
