计划任务at

网友投稿 497 2022-09-22

计划任务at

2013-03-09 saturday

1、查询软件是否安装

[root@desktop4 ~]# rpm -q at

at-3.1.10-43.el6.x86_64

[root@desktop4 ~]#

2、服务是否开启

[root@desktop4 ~]# service atd status

atd (pid 2281) is running...

[root@desktop4 ~]# service atd stop

Stopping atd:

[ OK ]

[root@desktop4 ~]# service atd start

Starting atd:

[ OK ]

[root@desktop4 ~]# service atd status

atd (pid 4030) is running...

[root@desktop4 ~]#

3、设置长期有效

[root@desktop4 ~]# chkconfig --list atd

atd 0:off 1:off 2:off 3:on 4:on 5:on 6:off

[root@desktop4 ~]#

[root@desktop4 ~]# chkconfig --level 35 atd off

[root@desktop4 ~]#

[root@desktop4 ~]# chkconfig --list atd

atd 0:off 1:off 2:off 3:off 4:on 5:off 6:off

[root@desktop4 ~]#

[root@desktop4 ~]# chkconfig --level 35 atd on

[root@desktop4 ~]#

[root@desktop4 ~]# chkconfig --list atd

atd 0:off 1:off 2:off 3:on 4:on 5:on 6:off

[root@desktop4 ~]#

4、管理at工作

（1）建立at工作

[root@desktop4 ~]# at 15:30

at> init 6

at>

job 2 at 2013-03-09 15:30

[root@desktop4 ~]#

（2）查询at队列

[root@desktop4 ~]# atq

2 2013-03-09 15:30 a root

[root@desktop4 ~]#

[root@desktop4 ~]# at -l

2 2013-03-09 15:30 a root

[root@desktop4 ~]#

（3）查看at工作内容

[root@desktop4 ~]# at -c 2

#!/bin/sh

# atrun uid=0 gid=0

# mail root 0

umask 22

ORBIT_SOCKETDIR=/tmp/orbit-root; export ORBIT_SOCKETDIR

HOSTNAME=desktop4.example.com; export HOSTNAME

IMSETTINGS_INTEGRATE_DESKTOP=yes; export IMSETTINGS_INTEGRATE_DESKTOP

SHELL=/bin/bash; export SHELL

XDG_SESSION_COOKIE=551055dcd66cd454041dddca00000022-1362812677.11524-871624707; export XDG_SESSION_COOKIE

HISTSIZE=1000; export HISTSIZE

GTK_RC_FILES=/etc/gtk/gtkrc:/root/.gtkrc-1.2-gnome2; export GTK_RC_FILES

WINDOWID=18874371; export WINDOWID

QTDIR=/usr/lib64/qt-3.3; export QTDIR

QTINC=/usr/lib64/qt-3.3/include; export QTINC

IMSETTINGS_MODULE=X\ compose\ table; export IMSETTINGS_MODULE

USER=root; export USER

LS_COLORS=rs=0:di=01\;34:ln=01\;36:mh=00:pi=40\;33:so=01\;35:do=01\;35:bd=40\;33\;01:cd=40\;33\;01:or=40\;31\;01:mi=01\;05\;37\;41:su=37\;41:sg=30\;43:ca=30\;41:tw=30\;42:ow=34\;42:st=37\;44:ex=01\;32:\*.tar=01\;31:\*.tgz=01\;31:\*.arj=01\;31:\*.taz=01\;31:\*.lzh=01\;31:\*.lzma=01\;31:\*.tlz=01\;31:\*.txz=01\;31:\*.zip=01\;31:\*.z=01\;31:\*.Z=01\;31:\*.dz=01\;31:\*.gz=01\;31:\*.lz=01\;31:\*.xz=01\;31:\*.bz2=01\;31:\*.tbz=01\;31:\*.tbz2=01\;31:\*.bz=01\;31:\*.tz=01\;31:\*.deb=01\;31:\*.rpm=01\;31:\*.jar=01\;31:\*.rar=01\;31:\*.ace=01\;31:\*.zoo=01\;31:\*.cpio=01\;31:\*.7z=01\;31:\*.rz=01\;31:\*.jpg=01\;35:\*.jpeg=01\;35:\*.gif=01\;35:\*.bmp=01\;35:\*.pbm=01\;35:\*.pgm=01\;35:\*.ppm=01\;35:\*.tga=01\;35:\*.xbm=01\;35:\*.xpm=01\;35:\*.tif=01\;35:\*.tiff=01\;35:\*.png=01\;35:\*.svg=01\;35:\*.svgz=01\;35:\*.mng=01\;35:\*.pcx=01\;35:\*.mov=01\;35:\*.mpg=01\;35:\*.mpeg=01\;35:\*.m2v=01\;35:\*.mkv=01\;35:\*.ogm=01\;35:\*.mp4=01\;35:\*.m4v=01\;35:\*.mp4v=01\;35:\*.vob=01\;35:\*.qt=01\;35:\*.nuv=01\;35:\*.wmv=01\;35:\*.asf=01\;35:\*.rm=01\;35:\*.rmvb=01\;35:\*.flc=01\;35:\*.avi=01\;35:\*.fli=01\;35:\*.flv=01\;35:\*.gl=01\;35:\*.dl=01\;35:\*.xcf=01\;35:\*.xwd=01\;35:\*.yuv=01\;35:\*.cgm=01\;35:\*.emf=01\;35:\*.axv=01\;35:\*.anx=01\;35:\*.ogv=01\;35:\*.ogx=01\;35:\*.aac=01\;36:\*.au=01\;36:\*.flac=01\;36:\*.mid=01\;36:\*.midi=01\;36:\*.mka=01\;36:\*.mp3=01\;36:\*.mpc=01\;36:\*.ogg=01\;36:\*.ra=01\;36:\*.wav=01\;36:\*.axa=01\;36:\*.oga=01\;36:\*.spx=01\;36:\*.xspf=01\;36:; export LS_COLORS

GNOME_KEYRING_SOCKET=/tmp/keyring-IroWjf/socket; export GNOME_KEYRING_SOCKET

SSH_AUTH_SOCK=/tmp/keyring-IroWjf/socket.ssh; export SSH_AUTH_SOCK

SESSION_MANAGER=local/unix:@/tmp/.ICE-unix/3639,unix/unix:/tmp/.ICE-unix/3639; export SESSION_MANAGER

USERNAME=root; export USERNAME

DESKTOP_SESSION=gnome; export DESKTOP_SESSION

MAIL=/var/spool/mail/root; export MAIL

PATH=/usr/lib64/qt-3.3/bin:/usr/local/sbin:/usr/sbin:/sbin:/usr/local/bin:/usr/bin:/bin:/root/bin; export PATH

QT_IM_MODULE=xim; export QT_IM_MODULE

PWD=/root; export PWD

XMODIFIERS=@im=none; export XMODIFIERS

GDM_KEYBOARD_LAYOUT=us; export GDM_KEYBOARD_LAYOUT

LANG=en_US.UTF-8; export LANG

GNOME_KEYRING_PID=3630; export GNOME_KEYRING_PID

GDM_LANG=en_US.UTF-8; export GDM_LANG

GDMSESSION=gnome; export GDMSESSION

SSH_ASKPASS=/usr/libexec/openssh/gnome-ssh-askpass; export SSH_ASKPASS

HISTCONTROL=ignoredups; export HISTCONTROL

HOME=/root; export HOME

SHLVL=2; export SHLVL

GNOME_DESKTOP_SESSION_ID=this-is-deprecated; export GNOME_DESKTOP_SESSION_ID

LOGNAME=root; export LOGNAME

QTLIB=/usr/lib64/qt-3.3/lib; export QTLIB

CVS_RSH=ssh; export CVS_RSH

DBUS_SESSION_BUS_ADDRESS=unix:abstract=/tmp/dbus-DQHKoNPeN6,guid=37107fffffb40e5e3cb136c9000008cb; export DBUS_SESSION_BUS_ADDRESS

LESSOPEN=\|/usr/bin/lesspipe.sh\ %s; export LESSOPEN

WINDOWPATH=7; export WINDOWPATH

G_BROKEN_FILENAMES=1; export G_BROKEN_FILENAMES

XAUTHORITY=/var/run/gdm/auth-for-root-bntku9/database; export XAUTHORITY

COLORTERM=gnome-terminal; export COLORTERM

cd /root || {

echo 'Execution directory inaccessible' >&2

exit 1

}

${SHELL:-/bin/sh} << 'marcinDELIMITER36c5ca6e'

init 6

marcinDELIMITER36c5ca6e

[root@desktop4 ~]#

（4）删除at工作队列

[root@desktop4 ~]# atrm 2

（5）查询结果

[root@desktop4 ~]# atq

[root@desktop4 ~]#

[root@desktop4 ~]# at -l

[root@desktop4 ~]#

5、at服务的访问控制

[root@desktop4 ~]# cat /etc/at.allow

cat: /etc/at.allow: No such file or directory

[root@desktop4 ~]# cat /etc/at.deny

（1）编辑允许使用at的用户

[root@desktop4 ~]# vim /etc/at.allow

chenglong

lilianjie

lixiaolong

（2）编辑拒绝使用at的用户

[root@desktop4 ~]# vim /etc/at.deny

lilianjie

lixiaolong

linxinru

（3）编辑用户

[root@desktop4 ~]# useradd chenglong

[root@desktop4 ~]# passwd chenglong

Changing password for user chenglong.

New password:

BAD PASSWORD: it is based on a dictionary word

BAD PASSWORD: is too simple

Retype new password:

passwd: all authentication tokens updated successfully.

[root@desktop4 ~]# useradd lilianjie

[root@desktop4 ~]# passwd lilianjie

Changing password for user lilianjie.

New password:

BAD PASSWORD: it is based on a dictionary word

BAD PASSWORD: is too simple

Retype new password:

passwd: all authentication tokens updated successfully.

[root@desktop4 ~]# useradd lixiaolong

[root@desktop4 ~]# passwd lixiaolong

Changing password for user lixiaolong.

New password:

BAD PASSWORD: it is based on a dictionary word

BAD PASSWORD: is too simple

Retype new password:

passwd: all authentication tokens updated successfully.

[root@desktop4 ~]# useradd linxinru

[root@desktop4 ~]# passwd linxinru

Changing password for user linxinru.

New password:

BAD PASSWORD: it is based on a dictionary word

BAD PASSWORD: is too simple

Retype new password:

passwd: all authentication tokens updated successfully.

[root@desktop4 ~]#

（4）验证

[root@desktop4 ~]# su - chenglong

[chenglong@desktop4 ~]$ pwd

/home/chenglong

[chenglong@desktop4 ~]$ at 16:00

at> vim 001.txt

at>

job 3 at 2013-03-09 16:00

[chenglong@desktop4 ~]$

[chenglong@desktop4 ~]$ exit

logout

[root@desktop4 ~]#

[root@desktop4 ~]# su - lilianjie

[lilianjie@desktop4 ~]$ at 16:00

at> vim 002.txt

at>

job 4 at 2013-03-09 16:00

[lilianjie@desktop4 ~]$

[lilianjie@desktop4 ~]$ exit

logout

[root@desktop4 ~]#

[root@desktop4 ~]# su - lixiaolong

[lixiaolong@desktop4 ~]$ at 16:00

at> vim 003.txt

at>

job 5 at 2013-03-09 16:00

[lixiaolong@desktop4 ~]$ exit

logout

[root@desktop4 ~]#

[root@desktop4 ~]# su - linxinru

[linxinru@desktop4 ~]$

[linxinru@desktop4 ~]$ at 16:00

You do not have permission to use at.

[linxinru@desktop4 ~]$ exit

logout

[root@desktop4 ~]#

（5）查询结果

[root@desktop4 ~]# atq

3 2013-03-09 16:00 a chenglong

4 2013-03-09 16:00 a lilianjie

5 2013-03-09 16:00 a lixiaolong

[root@desktop4 ~]#

（6）清空访问控制列表

[root@desktop4 ~]# vim /etc/at.allow

clear

[root@desktop4 ~]# vim /etc/at.deny

clear

6、备份与还原

（1）首先关闭服务

[root@desktop4 ~]# service atd status

atd (pid 4030) is running...

[root@desktop4 ~]# service atd stop

Stopping atd: [ OK ]

[root@desktop4 ~]# service atd status

atd is stopped

（2）打包文件

[root@desktop4 ~]# tar czf at-backup.tar /etc/at.* /var/spool/at/

tar: Removing leading `/' from member names

（3）删除原文件

[root@desktop4 at]# rm -rf /var/spool/at/*

[root@desktop4 at]#

（4）验证

[root@desktop4 at]# service atd start

Starting atd: [ OK ]

[root@desktop4 ~]# atq

[root@desktop4 ~]#

（5）解包（先停止服务）

[root@desktop7 ~]# service atd stop

Stopping atd: [ OK ]

[root@desktop7 ~]#

[root@desktop4 ~]# cd /

[root@desktop4 /]# tar xvf ~/at-backup.tar

etc/at.allow

etc/at.deny

var/spool/at/a00003015a9500

var/spool/at/a00004015a9500

var/spool/at/a00005015a9500

var/spool/at/spool/

You have new mail in /var/spool/mail/root

[root@desktop4 /]#

[root@desktop7 ~]# service atd start

Starting atd: [ OK ]

[root@desktop7 ~]#

[root@desktop4 /]# atq

3 2013-03-09 16:00 a chenglong

4 2013-03-09 16:00 a lilianjie

5 2013-03-09 16:00 a lixiaolong

[root@desktop4 /]#

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