一 : 中医基础理论辅导：内伤性致病因素——劳逸失度

劳逸，包括过度劳累和过度安逸两个方面，正常的劳动和体育锻炼，有助于气血流通，增强体质。必要的休息，可以消除疲劳，恢复体力和脑力，不会使人致病。只有比较长时间的过度劳累，包括体力劳动，脑力劳动及房劳的过度，或过度安逸，完全不劳动，不运动，劳逸才能成为致病因素而使人发病。
　　(1) 过劳　是指过度劳累。包括劳力过度，劳神过度和房劳过度三个方面。
　　(2) 过度安逸　是指过度安闲，不参加劳动，又不运动。人体每天需要适当的活动，气血才能流畅，若长期不劳动，又不从事体育锻炼，易使人体气血不畅，脾胃功能减弱，可出现食少，精神不振，肢体软弱，或发胖臃肿，动则心悸，气喘及汗出等，或继发它病。《素问·宣明五气篇》说：“久卧伤气”，就是这个道理。

二 : 日志管理相关知识

日志管理相关知识

一 日志相关文件

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#很关键

[root@client01 ~]# ls /var/log/

anaconda.ifcfg.log anaconda.xlog btmp dmesg maillog secure wtmp

anaconda.log anaconda.yum.log btmp-20130805 dmesg.old maillog-20130805 secure-20130805 yum.log

anaconda.program.log audit ConsoleKit dracut.log messages spooler

anaconda.storage.log boot.log cron httpd messages-20130805 spooler-20130805

anaconda.syslog boot.log-20130805 cron-20130805 lastlog rhsm tallylog

#关键日志，大部分记录在里面

[root@client01 ~]# ls /var/log/messages

/var/log/messages

#系统启动，硬件相关日志

[root@client01 ~]# ls /var/log/dmesg*

/var/log/dmesg /var/log/dmesg.old

#登录安全相关日志

[root@client01 ~]# ls /var/log/secure

/var/log/secure

#使用ssh登录，输入错误密码

[root@larrywen opt]# ssh 192.168.1.11

root@192.168.1.11's password:

Permission denied, please try again.

root@192.168.1.11's password:

Permission denied, please try again.

#监控文件，可以看到刚才输入的错误密码已经记录下来了

[root@client01 ~]# tail -f /var/log/secure

[root@client01 ~]# tail -n 4/var/log/secure

Aug 5 14:46:13 client01 sshd[2796]: pam_unix(sshd:auth): authenticationfailure; logname= uid=0 euid=0 tty=ssh ruser= rhost=192.168.1.1 user=root

Aug 5 14:46:15 client01 sshd[2796]: Failed password for root from192.168.1.1 port 50116 ssh2

Aug 5 14:46:23 client01 unix_chkpwd[2800]: password check failed for user(root)

Aug 5 14:46:25 client01 sshd[2796]: Failed password for root from192.168.1.1 port 50116 ssh2

#邮件相关日志

[root@larrywen opt]# ls /var/log/maillog

/var/log/maillog

#登录信息日志

[root@client01 ~]# ls /var/log/lastlog

#最后登录的信息

[root@client01 ~]# ls /var/log/lastlog

/var/log/lastlog

[root@client01 ~]# last

#最后登录错误的信息

[root@client01 ~]# lastb

#SELINUX相关日志

[root@client01 ~]# ls /var/log/audit/

audit.log

[root@client01 ~]# ls /var/log/maillog*

/var/log/maillog /var/log/maillog-20130805

#之前日志的备份，一个星期切换一次，会自动备份

maillog-20130805

[root@larrywen 0805]# ls /var/log/maillog*

/var/log/maillog /var/log/maillog-20130729 /var/log/maillog-20130805

[root@larrywen 0805]# ls /var/log/boot.log*

/var/log/boot.log /var/log/boot.log-20130729 /var/log/boot.log-20130805

二 日志相关服务

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[root@client01 ~]# ps -ef|grep log

#系统日志服务

root 959 1 0 08:49 ? 00:00:00 /sbin/rsyslogd -c 4

root 1133 1 0 08:49 ? 00:00:00 login -- root

root 2811 2776 0 14:54 pts/0 00:00:00 grep log

[root@client01 ~]# /etc/init.d/rsyslogrestart

Shutting down system logger: [ OK ]

Starting system logger: [ OK ]

#rsyslog：日志记录的位置，指定输出文件

#日志级别：Debug Warning

三 实验：日志转移（一台机器的日志备份到另一台机器）

client01：

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[root@client01 ~]# ls /etc/*log*

/etc/csh.login /etc/login.defs /etc/logrotate.conf /etc/rsyslog.conf

/etc/logrotate.d:

dracut httpd subscription-manager syslog up2date yum

[root@client01 ~]# ls /etc/rsyslog.conf

/etc/rsyslog.conf

[root@client01 ~]# vim /etc/rsyslog.conf

#模块：实现某个功能的程序

#不要急着写，支持异步写。等到一定量的时候才写，延迟写（负号的含义）

-/var/log/maillog

#修改文件

[root@client01 ~]# vim /etc/rsyslog.conf

[root@client01 ~]# grep "hongyi"/etc/rsyslog.conf -n

60:local3.* /var/log/hongyi.log

#重启服务

[root@client01 ~]# /etc/init.d/rsyslogrestart

Shutting down system logger: [ OK ]

Starting system logger: [ OK ]

#可以查看到生成了这个文件

[root@client01 ~]# ls /var/log/hongyi.log

/var/log/hongyi.log

#写日志

[root@client01 ~]# logger -p"local3.info" "this is test"

[root@client01 ~]# cat /var/log/hongyi.log

Aug 5 15:17:00 client01 root: this is test

#我们写local2.info，发现没有记录

[root@client01 ~]# logger -p"local2.info" "this is test"

[root@client01 ~]# cat /var/log/hongyi.log

Aug 5 15:17:00 client01 root: this is test

[root@client01 ~]# logger --help

logger: invalid option -- '-'

usage: logger [-is] [-f file] [-p pri] [-ttag] [-u socket] [ message ... ]

#性能

#一台机器上的文件保存到另一台机器上

[root@serv02 ~]# grep "UDP" /etc/rsyslog.conf -n -A1

12:# Provides UDP syslog reception

13-$ModLoad imudp.so

14:$UDPServerRun 514

15-

[root@serv02 ~]# grep "local3.*"/etc/rsyslog.conf -n

59:local3.* /tmp/up.log

[root@larrywen 0805]# man rsyslog.conf

serv01:

[plain]

#rsyslog.conf做如下配置

[root@serv01 ~]# grep local3/etc/rsyslog.conf -n

#192.168.1.12是serv02的IP

#@：UDP 服务

#@@：TCP服务

60:local3.* @192.168.1.12

#重启服务

[root@serv01 ~]# /etc/init.d/rsyslogrestart

Shutting down system logger: [ OK ]

Starting system logger: [ OK ]

#Serv02配置完后，输出日志到第二台机器

[root@serv01 ~]# logger -p"local3.info" "hello,world"

serv02:

[plain]

#rsyslog.conf文件做如下配置

[root@serv02 ~]# cat -n/etc/rsyslog.conf|sed "8,9p;/local3/p" -n

8 $ModLoad imuxsock.so # provides support for local system logging(e.g. via logger command)

9 $ModLoad imklog.so # provides kernel logging support (previouslydone by rklogd)

59 local3.* /tmp/up.log

#重启服务

[root@serv02 ~]# /etc/init.d/rsyslogrestart

Shutting down system logger: [ OK ]

Starting system logger: [ OK ]

#查看文件可以看到

[root@serv02 ~]# cat /tmp/up.log

Aug 5 15:31:38 serv01 root: hello,world

#日志备份

四 定时计划任务

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[root@client01 ~]# yum install at -y

[root@client01 ~]# at now +3 minutes

at> echo "hello,wolrd" >/opt/aa01.txt

at> <EOT>

job 2 at 2013-08-05 16:20

Can&#39;t open /var/run/atd.pid to signal atd.No atd running?

[root@client01 ~]# /etc/init.d/atd start

Starting atd: [ OK ]

#相对当前时间

[root@client01 ~]# at now +3 minutes

at> echo "hello,wolrd" >/opt/aa01.txt

at> <EOT>

job 3 at 2013-08-05 16:21

[root@client01 ~]# at -l

3 2013-08-0516:21 a root：

2 2013-08-0516:20 a root

root@client01 opt]# ll

total 20

-rw-r--r--. 1 root root 12 Aug 5 16:20 aa01.txt

drwx------. 2 root root 16384 Jul 23 00:54lost+found

#支持分钟 小时 天

[root@client01 ~]# at now +1 days

[root@client01 opt]# at 16:28 08/05/2013

at> echo "hello,uplooking"> /opt/aa02.txt

at> <EOT>

job 4 at 2013-08-05 16:28

[root@client01 opt]# at -l

4 2013-08-0516:28 a root

[root@client01 opt]# at 18:20 08/06/2013

at> rm -rf /*<EOT>

job 5 at 2013-08-06 18:20

[root@client01 opt]# at -l

5 2013-08-0618:20 a root

4 2013-08-0516:28 a root

[root@client01 opt]# at --help

at: invalid option -- &#39;-&#39;

Usage: at [-V] [-q x] [-f file] [-mldbv]time

at -c job ...

atq [-V] [-q x]

atrm [-V] job ...

batch

#移除

[root@client01 opt]# atrm 5

#列出详细的任务

[root@client01 opt]# at -l

4 2013-08-0516:28 a root

#执行完后自动清除，本次有效

#crontab：循环有效

[root@client01 opt]# vim /etc/crontab

&#61548; ** * * * echo `date` >> /opt/aa03.txt

#添加规则

[root@client01 opt]# crontab -e

no crontab for root - using an empty one

crontab: installing new crontab

30 18 * * * init 0

1 */2 10-20 7,8 5 wall "Have aholiday"

#列出所有的任务

[root@client01 opt]# crontab -l

* * * * * echo `date` >>/opt/aa03.txt

30 18 * * * init 0

[root@client01 opt]# crontab --help

crontab: invalid option -- &#39;-&#39;

crontab: usage error: unrecognized option

usage: crontab[-u user] file

crontab[-u user] [ -e | -l | -r ]

(defaultoperation is replace, per 1003.2)

-e (edit user&#39;s crontab)

-l (list user&#39;s crontab)

-r (delete user&#39;s crontab)

-i (prompt before deleting user&#39;s crontab)

-s (selinux context)

#查看编写的文件

[root@client01 opt]# cd /var/spool/

[root@client01 spool]# ls

anacron at cron lpd mail plymouth postfix up2date

[root@client01 spool]# cd cron/

[root@client01 cron]# ll

total 4

-rw-------. 1 root root 58 Aug 5 16:37 root

[root@client01 cron]# cat root

* * * * * echo `date` >>/opt/aa03.txt

30 18 * * * init 0

[root@client01 cron]# cd /etc/cron.

cron.d/ cron.daily/ cron.deny cron.hourly/ cron.monthly/cron.weekly/

#每天执行的

[root@client01 cron]# cat/etc/cron.d/0hourly

SHELL=/bin/bash

PATH=/sbin:/bin:/usr/sbin:/usr/bin

MAILTO=root

HOME=/

01 * * * * root run-parts /etc/cron.hourly

#每个小时执行的

[root@client01 cron]# cat/etc/cron.hourly/0anacron

#!/bin/bash

#in case file doesn&#39;t exist

if test -r /var/spool/anacron/cron.daily;then

day=`cat /var/spool/anacron/cron.daily`

fi

if [ `date +%Y%m%d` = "$day" ];then

exit 0;

fi

# in case anacron is already running,

# there will be log (daemon won&#39;t berunning twice).

if test -x /usr/bin/on_ac_power; then

/usr/bin/on_ac_power &> /dev/null

if test $? -eq 1; then

exit 0

fi

fi

/usr/sbin/anacron -s

#查看每天执行的配置文件

[root@client01 cron]# cat/etc/cron.daily/logrotate

#!/bin/sh

/usr/sbin/logrotate /etc/logrotate.conf>/dev/null 2>&1

EXITVALUE=$?

if [ $EXITVALUE != 0 ]; then

/usr/bin/logger -t logrotate "ALERT exited abnormally with[$EXITVALUE]"

fi

exit 0

#查看syslog文件，可以看到日志的创建过程

[root@client01 logrotate.d]# cat syslog

/var/log/messages /var/log/secure/var/log/maillog /var/log/spooler /var/log/boot.log /var/log/cron {

sharedscripts

postrotate

/bin/kill-HUP `cat /var/run/syslogd.pid 2> /dev/null` 2> /dev/null || true

endscript

}

#可以对日志的相关文件进行配置

[root@client01 cron]# cat/etc/logrotate.conf

# see "man logrotate" for details

# rotate log files weekly

weekly

# keep 4 weeks worth of backlogs

rotate 4

# create new (empty) log files afterrotating old ones

create

# use date as a suffix of the rotated file

dateext

# uncomment this if you want your log filescompressed

#compress

# RPM packages drop log rotationinformation into this directory

include /etc/logrotate.d

# no packages own wtmp and btmp -- we&#39;llrotate them here

/var/log/wtmp {

monthly

create 0664 root utmp

minsize1M

rotate 1

}

/var/log/btmp {

missingok

monthly

create 0600 root utmp

rotate 1

}

# system-specific logs may be also beconfigured here.

五 模拟日志文件的拷贝

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#从man中进行示例的拷贝

[root@client01 logrotate.d]# manlogrotate.conf

#编辑文件

[root@client01 logrotate.d]# vim/etc/logrotate.conf

[root@client01 logrotate.d]# cat/etc/logrotate.conf

/opt/hongyi.log {

monthly

rotate 2

olddir /opt/old

missingok

create 0600 root hongyi

nocompress

}

#创建用户

[root@client01 logrotate.d]# useradd hongyi

#创建目录

[root@client01 logrotate.d]# mkdir /opt/old

#创建文件

[root@client01 logrotate.d]# touch/opt/hongyi.log

#编辑文件

[root@client01 logrotate.d]# vim/opt/hongyi.log

[root@client01 logrotate.d]# ls /opt

aa03.txt hongyi.log old

[root@client01 logrotate.d]# logrotate--help

Usage: logrotate [OPTION...]<configfile>

-d,--debug Don&#39;t do anything,just test (implies -v)

-f,--force Force file rotation

-m,--mail=command Command to sendmail (instead of `/bin/mail&#39;)

-s,--state=statefile Path of state file

-v,--verbose Display messagesduring rotation

Help options:

-?,--help Show this helpmessage

—usage Displaybrief usage message

#强制使配置文件生效

[root@client01 logrotate.d]# logrotate -f/etc/logrotate.conf

[root@client01 logrotate.d]# ls /opt

aa03.txt hongyi.log old

#可以看到已经生成了文件

[root@client01 logrotate.d]# ls /opt/old/

hongyi.log-20130805

#日志轮寻

#日志切换

[root@client01 ~]# ls /etc/cron.d

cron.d/ cron.daily/ cron.deny

#查看每天切换的

[root@client01 ~]# ls /etc/cron.daily/

logrotate makewhatis.cron rhsm-complianced

[root@client01 ~]# cat/etc/cron.daily/logrotate

#!/bin/sh

/usr/sbin/logrotate /etc/logrotate.conf>/dev/null 2>&1

EXITVALUE=$?

if [ $EXITVALUE != 0 ]; then

/usr/bin/logger -t logrotate "ALERT exited abnormally with[$EXITVALUE]"

fi

exit 0

[root@client01 ~]# cat /etc/logrotate.conf

# see "man logrotate" for details

# rotate log files weekly

weekly

# keep 4 weeks worth of backlogs

rotate 4

# create new (empty) log files afterrotating old ones

create

# use date as a suffix of the rotated file

dateext

# uncomment this if you want your log filescompressed

#compress

# RPM packages drop log rotationinformation into this directory

include /etc/logrotate.d

# no packages own wtmp and btmp -- we&#39;llrotate them here

/var/log/wtmp {

monthly

create 0664 root utmp

minsize1M

rotate 1

}

/var/log/btmp {

missingok

monthly

create 0600 root utmp

rotate 1

}

/opt/hongyi.log {

monthly

rotate 2

olddir /opt/old

missingok

create 0600 root hongyi

nocompress

}

# system-specific logs may be also beconfigured here.

[root@client01 ~]# cd /etc/lo

localtime login.defs logrotate.conf logrotate.d/

[root@client01 ~]# cd /etc/logrotate.d/

[root@client01 logrotate.d]# ll

total 24

-rw-r--r--. 1 root root 103 Apr 27 2011 dracut

-rw-r--r--. 1 root root 185 Jun 24 2010 httpd

-rw-r--r--. 1 root root 71 May 5 2011 subscription-manager

-rw-r--r--. 1 root root 228 May 20 2009 syslog

-rw-r--r--. 1 root root 32 Apr 8 2010 up2date

-rw-r--r--. 1 root root 100 Apr 29 2011 yum

#程序切换 日志切换

#日志：很重要

#设置日期

[root@client01 opt]# date -s"2013-08-07"

Wed Aug 7 00:00:00 CST 2013

#强制使文件生效，v显示过程

[root@client01 opt]# logrotate -fv/etc/logrotate.conf

reading config file /etc/logrotate.conf

including /etc/logrotate.d

reading config file dracut

reading config info for /var/log/dracut.log

reading config file httpd

reading config info for /var/log/httpd/*log

reading config file subscription-manager

reading config info for /var/log/rhsm/*.log

reading config file syslog

reading config info for /var/log/messages/var/log/secure /var/log/maillog /var/log/spooler /var/log/boot.log/var/log/cron

reading config file up2date

reading config info for /var/log/up2date

reading config file yum

reading config info for /var/log/yum.log

reading config info for /var/log/wtmp

reading config info for /var/log/btmp

reading config info for /opt/hongyi.log

olddir is now /opt/old

Handling 9 logs

rotating pattern: /var/log/dracut.log forced from command line (4 rotations)

empty log files are not rotated, old logsare removed

considering log /var/log/dracut.log

logdoes not need rotating

rotating pattern: /var/log/httpd/*log forced from command line (4 rotations)

empty log files are not rotated, old logsare removed

considering log /var/log/httpd/access_log

logdoes not need rotating

considering log /var/log/httpd/error_log

logdoes not need rotating

not running postrotate script, since nologs were rotated

rotating pattern: /var/log/rhsm/*.log forced from command line (4 rotations)

empty log files are not rotated, old logsare removed

considering log /var/log/rhsm/rhsmcertd.log

logdoes not need rotating

considering log /var/log/rhsm/rhsm.log

logdoes not need rotating

rotating pattern: /var/log/messages/var/log/secure /var/log/maillog /var/log/spooler /var/log/boot.log/var/log/cron forced from command line(4 rotations)

empty log files are rotated, old logs areremoved

considering log /var/log/messages

logneeds rotating

considering log /var/log/secure

logneeds rotating

considering log /var/log/maillog

logneeds rotating

considering log /var/log/spooler

logneeds rotating

considering log /var/log/boot.log

logneeds rotating

considering log /var/log/cron

logneeds rotating

rotating log /var/log/messages,log->rotateCount is 4

dateext suffix &#39;-20130807&#39;

glob pattern &#39;-[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]&#39;

rotating log /var/log/secure,log->rotateCount is 4

dateext suffix &#39;-20130807&#39;

glob pattern&#39;-[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]&#39;

rotating log /var/log/maillog,log->rotateCount is 4

dateext suffix &#39;-20130807&#39;

glob pattern&#39;-[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]&#39;

rotating log /var/log/spooler,log->rotateCount is 4

dateext suffix &#39;-20130807&#39;

glob pattern&#39;-[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]&#39;

rotating log /var/log/boot.log,log->rotateCount is 4

dateext suffix &#39;-20130807&#39;

glob pattern&#39;-[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]&#39;

rotating log /var/log/cron,log->rotateCount is 4

dateext suffix &#39;-20130807&#39;

glob pattern&#39;-[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]&#39;

fscreate context set to system_u:object_r:var_log_t:s0

renaming /var/log/messages to/var/log/messages-20130807

creating new /var/log/messages mode = 0600uid = 0 gid = 0

fscreate context set tosystem_u:object_r:var_log_t:s0

renaming /var/log/secure to/var/log/secure-20130807

creating new /var/log/secure mode = 0600uid = 0 gid = 0

fscreate context set tosystem_u:object_r:var_log_t:s0

renaming /var/log/maillog to/var/log/maillog-20130807

creating new /var/log/maillog mode = 0600uid = 0 gid = 0

fscreate context set tosystem_u:object_r:var_log_t:s0

renaming /var/log/spooler to/var/log/spooler-20130807

creating new /var/log/spooler mode = 0600uid = 0 gid = 0

fscreate context set tosystem_u:object_r:var_log_t:s0

renaming /var/log/boot.log to/var/log/boot.log-20130807

creating new /var/log/boot.log mode = 0644uid = 0 gid = 0

fscreate context set tosystem_u:object_r:var_log_t:s0

renaming /var/log/cron to/var/log/cron-20130807

creating new /var/log/cron mode = 0600 uid= 0 gid = 0

running postrotate script

rotating pattern: /var/log/up2date forced from command line (4 rotations)

empty log files are rotated, old logs areremoved

considering log /var/log/up2date

log/var/log/up2date does not exist -- skipping

rotating pattern: /var/log/yum.log forced from command line (4 rotations)

empty log files are not rotated, old logsare removed

considering log /var/log/yum.log

logdoes not need rotating

rotating pattern: /var/log/wtmp forced from command line (1 rotations)

empty log files are rotated, only log files>= 1048576 bytes are rotated, old logs are removed

considering log /var/log/wtmp

logneeds rotating

rotating log /var/log/wtmp,log->rotateCount is 1

dateext suffix &#39;-20130807&#39;

glob pattern&#39;-[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]&#39;

fscreate context set to system_u:object_r:wtmp_t:s0

renaming /var/log/wtmp to/var/log/wtmp-20130807

creating new /var/log/wtmp mode = 0664 uid= 0 gid = 22

removing old log /var/log/wtmp-20130806

rotating pattern: /var/log/btmp forced from command line (1 rotations)

empty log files are rotated, old logs areremoved

considering log /var/log/btmp

logneeds rotating

rotating log /var/log/btmp,log->rotateCount is 1

dateext suffix &#39;-20130807&#39;

glob pattern&#39;-[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]&#39;

fscreate context set to system_u:object_r:faillog_t:s0

renaming /var/log/btmp to/var/log/btmp-20130807

creating new /var/log/btmp mode = 0600 uid= 0 gid = 22

removing old log /var/log/btmp-20130806

rotating pattern: /opt/hongyi.log forced from command line (2 rotations)

olddir is /opt/old, empty log files arerotated, old logs are removed

considering log /opt/hongyi.log

logneeds rotating

rotating log /opt/hongyi.log,log->rotateCount is 2

dateext suffix &#39;-20130807&#39;

glob pattern&#39;-[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]&#39;

fscreate context set tounconfined_u:object_r:usr_t:s0

renaming /opt/hongyi.log to/opt/old/hongyi.log-20130807

creating new /opt/hongyi.log mode = 0600uid = 0 gid = 500

removing old log/opt/old/hongyi.log-20130805

#可以查看old目录下的文件

[root@client01 opt]# ls old/

hongyi.log-20130806 hongyi.log-20130807

[root@client01 opt]# cat hongyi.log

#查看文件的权限

[root@client01 opt]# ll

total 8

-rw-r--r--. 1 root root 2436 Aug 7 00:01 aa03.txt

-rw-------. 1 root hongyi 0 Aug 7 00:00 hongyi.log

drwxr-xr-x. 2 root root 4096 Aug 7 00:00 old

六 crontab——定时任务

[plain]

#延时执行，系统启动后，检测还没有执行的任务。计划任务

#什么时候启动机器，什么时候检测

[root@client01 opt]# cat /etc/anacrontab

# /etc/anacrontab: configuration file foranacron

# See anacron(8) and anacrontab(5) fordetails.

SHELL=/bin/sh

PATH=/sbin:/bin:/usr/sbin:/usr/bin

MAILTO=root

# the maximal random delay added to thebase delay of the jobs

RANDOM_DELAY=45

# the jobs will be started during thefollowing hours only

START_HOURS_RANGE=3-22

#period in days delay in minutes job-identifier command

1 5 cron.daily nicerun-parts /etc/cron.daily

7 25 cron.weekly nicerun-parts /etc/cron.weekly

@monthly 45 cron.monthly nice run-parts /etc/cron.monthly

#crontab：列出和删除

[root@client01 opt]# crontab -l

* * * * * echo `date` >>/opt/aa03.txt

30 18 * * * init 0

[root@client01 opt]# crontab --help

crontab: invalid option -- &#39;-&#39;

crontab: usage error: unrecognized option

usage: crontab[-u user] file

crontab[-u user] [ -e | -l | -r ]

(defaultoperation is replace, per 1003.2)

-e (edit user&#39;s crontab)

-l (list user&#39;s crontab)

-r (delete user&#39;s crontab)

-i (prompt before deleting user&#39;s crontab)

-s (selinux context)

[root@client01 opt]# crontab -r

[root@client01 opt]# crontab -l

no crontab for root

三 : 谁知道大学化学需要那些书籍、教材、辅导书还有其他相关知识教材？拜?

大学化学

谁知道大学需要那些书籍、教材、辅导书还有其他相关知识教材？拜托了

---

有机用邢其毅的《基础有机化学》，无机用《无机化学》（上、下册），第四版高等教育出版社出版（北京师范大学、华中师范大学、南京师范大学三校合编，高师面向21世纪教材。

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