시스템 예약작업을 설정하는 batch 사용법

[참고사항]

리눅스에는 예약작업에 관한 명령어들이 있습니다.

 즉, at, atq, atrm, atd, atrun, batch등이 그것입니다.

 즉, 이들 명령어들은 모두 지정된 시각에 특정작업을 수행할 수 있는 예약작업에 관한 명령어들로서 모두 함께 익혀두셔야하는 것입니다.

  이와 함께 주기적(반복적)인 작업을 할 수 있는 crontab에 관한 명령어들도 함께 알아두신다면 완벽해 질 수 있습니다.

[root@command root]# ls -l backup.sh

-rwxr-xr-x    1 root     root           65 Mar 28 18:22 backup.sh

[root@command root]#

[root@command root]# cat backup.sh

/etc/rc.d/init.d/sendmail restart

/etc/rc.d/init.d/httpd restart

[root@command root]#

[root@command root]# batch -f /root/backup.sh 20:00

job 11 at 2023-03-28 20:00

[root@command root]#

[root@command root]#

[root@command root]# batch -f /root/backup.sh 21:00

job 12 at 2023-03-28 21:00

[root@command root]#

[root@command root]# ls -l /var/spool/at

total 12

-rwx------    1 root     root         1807 Mar 28 18:34 b0000b0112c734

-rwx------    1 root     root         1807 Mar 28 18:34 b0000c0112c770

drwx------    2 daemon   daemon       4096 Mar 23 23:00 spool

[root@command root]#

[root@command root]# cat /var/spool/at/b0000b0112c734

#!/bin/sh

# atrun uid=0 gid=0

# mail     root 0

umask 22

HOSTNAME=command.superuser.co.kr; export HOSTNAME

PVM_RSH=/usr/bin/rsh; export PVM_RSH

HISTSIZE=1000; export HISTSIZE

SSH_CLIENT=192.168.0.12\ 1393\ 22; export SSH_CLIENT

QTDIR=/usr/lib/qt-3.1; export QTDIR

SSH_TTY=/dev/ttyp0; export SSH_TTY

USER=root; export USER

LS_COLORS=no=00:fi=00:di=01\;34:ln=01\;36:pi=40\;33:so=01\;35:bd=40\;33\;01:cdz=01\;

31:\*.rpm=01\;31:\*.cpio=01\;31:\*.jpg=01\;35:\*.gif=01\;35:\*.bmp=01\;35:\*.xbm=01\;

35:\*.xpm=01\;35:\*.png=01\;35:\*.tif=01\;35:; export LS_COLORS

PVM_ROOT=/usr/share/pvm3; export PVM_ROOT

USERNAME=root; export USERNAME

PATH=/usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:

/usr/sbin:/usr/bin:/usr/X11R6/bin:/root/bin; export PATH

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

PWD=/root; export PWD

INPUTRC=/etc/inputrc; export INPUTRC

LANG=en_US.UTF-8; export LANG

LAMHELPFILE=/etc/lam/lam-helpfile; export LAMHELPFILE

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

HOME=/root; export HOME

SHLVL=1; export SHLVL

XPVM_ROOT=/usr/share/pvm3/xpvm; export XPVM_ROOT

BASH_ENV=/root/.bashrc; export BASH_ENV

LOGNAME=root; export LOGNAME

SSH_CONNECTION=192.168.0.12\ 1393\ 192.168.0.111\ 22; export SSH_CONNECTION

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

G_BROKEN_FILENAMES=1; export G_BROKEN_FILENAMES

cd /root || {

         echo 'Execution directory inaccessible' >&2

         exit 1

}

/etc/rc.d/init.d/sendmail restart

/etc/rc.d/init.d/httpd restart

[root@command root]#

[root@command root]# atq

11      2023-03-28 20:00 b root

12      2023-03-28 21:00 b root

[root@command root]#

[root@command root]# atrm 11

[root@command root]#

[root@command root]# atq

12      2023-03-28 21:00 b root

[root@command root]#