幽灵资源网 Design By www.bzswh.com

我们经常会通过find命令进行批量操作,如:批量删除旧文件、批量修改、基于时间的文件统计、基于文件大小的文件统计等,在这些操作当中,由于rm删除操作会导致目录结构变化,如果要通过find结合rm的操作写成脚本,就会遇到一些麻烦,本文通过一个例子为大家进行介绍。

系统环境:

SUSE Linux Enterprise Server 11 或

Red Hat Enterprise Linux

问题症状:

客户现场有一个自动化的脚本,有以下的find语句,每天运行以删除某个目录下7天以前的文件或目录,这些目录都是按时间顺序生成PostgreSQL数据库的WAL日志及其错误日志pg_log:

/bin/find /enterprisedb_backup/postgresql/ -mtime +7 -exec /bin/rm -rf '{}' \;

运行过程中,间歇性地出现以下错误:

[root@edb ~]# /bin/find /enterprisedb_backup/postgresql/ -mtime +7 -exec /bin/rm -rf {} \;
/bin/find: `/enterprisedb_backup/postgresql/network-scripts': No such file or directory
[root@edb ~]# echo $"color: #ff0000">问题分析:

进行故障重现,在另一台服务器中通过模拟数据单独运行find命令分析此问题,测试过程如下:

1.模拟数据

[root@edbnode1 ~]# date
Wed Jun 18 23:08:18 CST 2014

[root@edbnode1 ~]# cp -rcp /etc/sysconfig/network-scripts/ /enterprisedb_backup/postgresql/
[root@edbnode1 ~]# cp -rcp /etc/init.d/iptables /enterprisedb_backup/postgresql/## 以上通过 cp -rcp 命令使得拷贝到目标目录的数据保持包括:建立时间、用户权根等信息,以模拟出一个旧文件及一个旧目录

[root@edbnode1 ~]# ll /enterprisedb_backup/postgresql/
total 16
-rwxr-xr-x. 1 root root 9409 Oct 31 2012 iptables
drwxr-xr-x. 2 root root 4096 Jun 18 2013 network-scripts## 以上可以看到iptables文件是2012年建立的,network-scripts是2013年建立的,都远远超过了7天

[root@edbnode1 ~]# ll /enterprisedb_backup/postgresql/*
-rwxr-xr-x. 1 root root 9409 Oct 31 2012 /enterprisedb_backup/postgresql/iptables

/enterprisedb_backup/postgresql/network-scripts:
total 212
-rw-r--r--. 1 root root  159 Jun 18 2013 ifcfg-eth0
-rw-r--r--. 1 root root  203 Jun 18 2013 ifcfg-eth1
-rw-r--r--. 1 root root  203 Jun 18 2013 ifcfg-eth2
-rw-r--r--. 1 root root  254 Jan 9 2013 ifcfg-lo
lrwxrwxrwx. 1 root root  20 Jun 18 2013 ifdown -> ../../../sbin/ifdown
-rwxr-xr-x. 1 root root  627 Jan 9 2013 ifdown-bnep
-rwxr-xr-x. 1 root root 5397 Jan 9 2013 ifdown-eth
-rwxr-xr-x. 1 root root  781 Jan 9 2013 ifdown-ippp
-rwxr-xr-x. 1 root root 4168 Jan 9 2013 ifdown-ipv6
lrwxrwxrwx. 1 root root  11 Jun 18 2013 ifdown-isdn -> ifdown-ippp
-rwxr-xr-x. 1 root root 1481 Jan 9 2013 ifdown-post
-rwxr-xr-x. 1 root root 1064 Jan 9 2013 ifdown-ppp
-rwxr-xr-x. 1 root root  835 Jan 9 2013 ifdown-routes
-rwxr-xr-x. 1 root root 1370 Jan 9 2013 ifdown-sit
-rwxr-xr-x. 1 root root 1434 Jan 9 2013 ifdown-tunnel
lrwxrwxrwx. 1 root root  18 Jun 18 2013 ifup -> ../../../sbin/ifup
-rwxr-xr-x. 1 root root 12365 Jan 9 2013 ifup-aliases
-rwxr-xr-x. 1 root root  859 Jan 9 2013 ifup-bnep
-rwxr-xr-x. 1 root root 10157 Jan 9 2013 ifup-eth
-rwxr-xr-x. 1 root root 11971 Jan 9 2013 ifup-ippp
-rwxr-xr-x. 1 root root 10401 Jan 9 2013 ifup-ipv6
lrwxrwxrwx. 1 root root   9 Jun 18 2013 ifup-isdn -> ifup-ippp
-rwxr-xr-x. 1 root root  727 Jan 9 2013 ifup-plip
-rwxr-xr-x. 1 root root  954 Jan 9 2013 ifup-plusb
-rwxr-xr-x. 1 root root 2364 Jan 9 2013 ifup-post
-rwxr-xr-x. 1 root root 4154 Jan 9 2013 ifup-ppp
-rwxr-xr-x. 1 root root 1925 Jan 9 2013 ifup-routes
-rwxr-xr-x. 1 root root 3499 Jan 9 2013 ifup-sit
-rwxr-xr-x. 1 root root 2488 Jan 9 2013 ifup-tunnel
-rwxr-xr-x. 1 root root 3770 Jan 9 2013 ifup-wireless
-rwxr-xr-x. 1 root root 4623 Jan 9 2013 init.ipv6-global
-rwxr-xr-x. 1 root root 1125 Jan 9 2013 net.hotplug
-rw-r--r--. 1 root root 13079 Jan 9 2013 network-functions
-rw-r--r--. 1 root root 29853 Jan 9 2013 network-functions-ipv6
## 以上可以看到network-script不是一个空的目录,当中还有文件,而且文件也都已经是7天前建立的了 

2.测试单独模拟执行脚本中的find + rm指令

[root@edbnode1 ~]# /bin/find /enterprisedb_backup/postgresql/ -mtime +7 -exec /bin/rm -rf {} \;
/bin/find: `/enterprisedb_backup/postgresql/network-scripts': No such file or directory
[root@edbnode1 ~]# echo $"htmlcode">
[root@edbnode1 ~]# cp -rcp /etc/sysconfig/network-scripts/ /enterprisedb_backup/postgresql/
[root@edbnode1 ~]# cp -rcp /etc/init.d/iptables /enterprisedb_backup/postgresql/
[root@edbnode1 ~]# /bin/find /enterprisedb_backup/postgresql/ -mtime +7 -exec /bin/ls {} \;
ifcfg-eth0 ifcfg-lo	 ifdown-eth  ifdown-isdn ifdown-routes ifup		ifup-eth  ifup-isdn  ifup-post  ifup-sit	  init.ipv6-global  network-functions-ipv6
ifcfg-eth1 ifdown	 ifdown-ippp ifdown-post ifdown-sit	 ifup-aliases	ifup-ippp ifup-plip  ifup-ppp   ifup-tunnel  net.hotplug
ifcfg-eth2 ifdown-bnep ifdown-ipv6 ifdown-ppp  ifdown-tunnel ifup-bnep	ifup-ipv6 ifup-plusb ifup-routes ifup-wireless network-functions
/enterprisedb_backup/postgresql/network-scripts/ifup-plusb
/enterprisedb_backup/postgresql/network-scripts/ifup-sit
/enterprisedb_backup/postgresql/network-scripts/ifdown-post
/enterprisedb_backup/postgresql/network-scripts/ifcfg-lo
/enterprisedb_backup/postgresql/network-scripts/network-functions
/enterprisedb_backup/postgresql/network-scripts/ifup-bnep
/enterprisedb_backup/postgresql/network-scripts/ifup-ippp
/enterprisedb_backup/postgresql/network-scripts/ifdown-sit
/enterprisedb_backup/postgresql/network-scripts/ifdown-tunnel
/enterprisedb_backup/postgresql/network-scripts/ifup-plip
/enterprisedb_backup/postgresql/network-scripts/ifup-eth
/enterprisedb_backup/postgresql/network-scripts/ifdown-ipv6
/enterprisedb_backup/postgresql/network-scripts/ifdown-ippp
/enterprisedb_backup/postgresql/network-scripts/ifup-aliases
/enterprisedb_backup/postgresql/network-scripts/network-functions-ipv6
/enterprisedb_backup/postgresql/network-scripts/ifup-ipv6
/enterprisedb_backup/postgresql/network-scripts/ifup-post
/enterprisedb_backup/postgresql/network-scripts/ifcfg-eth2
/enterprisedb_backup/postgresql/network-scripts/ifcfg-eth1
/enterprisedb_backup/postgresql/network-scripts/ifdown-ppp
/enterprisedb_backup/postgresql/network-scripts/ifup-isdn
/enterprisedb_backup/postgresql/network-scripts/ifcfg-eth0
/enterprisedb_backup/postgresql/network-scripts/ifdown
/enterprisedb_backup/postgresql/network-scripts/ifup-wireless
/enterprisedb_backup/postgresql/network-scripts/ifup-ppp
/enterprisedb_backup/postgresql/network-scripts/ifdown-eth
/enterprisedb_backup/postgresql/network-scripts/init.ipv6-global
/enterprisedb_backup/postgresql/network-scripts/ifdown-isdn
/enterprisedb_backup/postgresql/network-scripts/ifup-tunnel
/enterprisedb_backup/postgresql/network-scripts/ifdown-routes
/enterprisedb_backup/postgresql/network-scripts/ifdown-bnep
/enterprisedb_backup/postgresql/network-scripts/net.hotplug
/enterprisedb_backup/postgresql/network-scripts/ifup
/enterprisedb_backup/postgresql/network-scripts/ifup-routes
/enterprisedb_backup/postgresql/iptables

通过以上操作我们可以看到,find命令不单查询了/enterprisedb_backup/postgresql/目录,并且遍历了所有子目录,因此支持了我们的推断

4.综上所述基本定位问题所在

解决方案:

1.整理思路后,可以确认,如果find只找出所需操作目录的第1层文件及目录即可解决此问题

2.通过伟大的 man 命令我们得到以下信息

-maxdepth levels
  Descend at most levels (a non-negative integer) levels of directories below the command line arguments. -maxdepth 0 means only apply the tests and actions to the command line arguments. 

3.测试操作确认修改为:

[root@edbnode1 ~]# /bin/find /enterprisedb_backup/postgresql/ -mtime +7 -maxdepth 1 -exec /bin/rm -rf {} \;
/bin/find: warning: you have specified the -maxdepth option after a non-option argument -mtime, but options are not positional (-maxdepth affects tests specified before it as well as those specified after it). Please specify options before other arguments.

这里意思是说:-mtime找到的信息可能会操过-maxdepth的范围,在find操作中建议-maxdepth放在所有其他参数的前面

解决结果【完成】

以上这篇浅谈Linux下通过find命令进行rm文件删除的小技巧就是小编分享给大家的全部内容了,希望能给大家一个参考,也希望大家多多支持。

标签:
linux,find,rm

幽灵资源网 Design By www.bzswh.com
广告合作:本站广告合作请联系QQ:858582 申请时备注:广告合作(否则不回)
免责声明:本站文章均来自网站采集或用户投稿,网站不提供任何软件下载或自行开发的软件! 如有用户或公司发现本站内容信息存在侵权行为,请邮件告知! 858582#qq.com
幽灵资源网 Design By www.bzswh.com

稳了!魔兽国服回归的3条重磅消息!官宣时间再确认!

昨天有一位朋友在大神群里分享,自己亚服账号被封号之后居然弹出了国服的封号信息对话框。

这里面让他访问的是一个国服的战网网址,com.cn和后面的zh都非常明白地表明这就是国服战网。

而他在复制这个网址并且进行登录之后,确实是网易的网址,也就是我们熟悉的停服之后国服发布的暴雪游戏产品运营到期开放退款的说明。这是一件比较奇怪的事情,因为以前都没有出现这样的情况,现在突然提示跳转到国服战网的网址,是不是说明了简体中文客户端已经开始进行更新了呢?