使用shell脚本，找出/etc目录下以.conf结尾文件复制到/tmp下面 （四种方法）

[root@handsome-man ~]#  find /etc -type f -name '*.conf'|xargs cp -t /tmp
-t是cp的一个参数

2

[root@handsome-man ~]# cp $(find /etc -type f -name '*.conf') /tmp

find /etc/ -type f -name "*.conf"  -exec cp  {}   /tmp  \; 

find /etc/ -type f -name "*.conf"  |xargs -i cp {} /tmp/

xargs -i 让xargs后面可以使用{ } 表示前面find找出的文件 类似 - exec里面的{ }

打包备份/etc 目录到/backup 下面，保证每天备份的压缩名字不同

tar zcf  /backup/etc -$(date +%F).tar.gz /etc/ 

取出网卡ip地址

ip a s eth0

方法1 sed 正则

[root@handsome-man ~]# ip a  s eth0|sed -n '3p' |sed 's#^.*t ##g'|sed 's#/.*$##g'
10.0.0.202

方法2 sed 后向引用

[root@oldboyedu59 ~]# ip a s eth0 
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:0c:29:ff:79:0e brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.201/24 brd 10.0.0.255 scope global eth0
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:feff:790e/64 scope link 
       valid_lft forever preferred_lft forever
[root@oldboyedu59 ~]# ip a s eth0 |sed -n 3p 
    inet 10.0.0.201/24 brd 10.0.0.255 scope global eth0
[root@oldboyedu59 ~]# ip a s eth0 |sed -n 3p |sed -r 's#^.*t (.*)/.*$#\1#g'
10.0.0.201
[root@oldboyedu59 ~]# 
[root@oldboyedu59 ~]# ip a s eth0 |sed -n 3p |sed -r 's#(^.*t )(.*)(/.*$)#\1#g'
    inet 
[root@oldboyedu59 ~]# ip a s eth0 |sed -n 3p |sed -r 's#(^.*t )(.*)(/.*$)#\3#g'
/24 brd 10.0.0.255 scope global eth0

stat /etc/hosts
取出结果中的644