stat /etc/hosts 取行取列644

[root@xusx ~]# stat /etc/hosts
  File: `/etc/hosts'
  Size: 183        Blocks: 8          IO Block: 4096   regular file
Device: 802h/2050d Inode: 128037      Links: 2
Access: (0644/-rw-r--r--)  Uid: (    0/    root)   Gid: (    0/    root)
Access: 2016-11-30 17:27:01.196998563 +0800
Modify: 2016-11-30 17:22:54.530989179 +0800
Change: 2016-11-30 17:22:54.608997694 +0800

第一种

[root@xusx ~]# stat /etc/hosts |awk -F "[0/]+" 'NR==4{print $2}'
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[root@xusx ~]# stat /etc/hosts|sed -n '4p'|sed -r 's#(^.*(0)|(/-.*)$##g'　　=====>加括号
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[root@xusx ~]# stat /etc/hosts|sed -rn '4s#^.*(0|/-.*$##gp'
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[root@xusx ~]# stat /etc/hosts|sed -rn '4s#(^.*(0)|(/-.*$)##gp'
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第二种

[root@xusx ~]# stat /etc/hosts|sed -rn '4s#^.*(0(.*)/-.*$#1#gp' 　　====>后向引用()--->1
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第三种

[root@xusx ~]# stat /etc/hosts |awk -F "[0/]" 'NR==4{print $2}'　　======>[0/]+  ---->1次到多次
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第四种

[root@xusx ~]# stat -c %a /etc/hosts
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第五种

[root@xusx ~]# stat /etc/hosts|sed -n '4p'
Access: (0644/-rw-r--r--) Uid: ( 0/ root) Gid: ( 0/ root)
[root@xusx ~]# stat /etc/hosts|sed -n '4p'|cut -d "/" -f1 　　===>一次只能切一个字符
Access: (0644
[root@xusx ~]# stat /etc/hosts|sed -n '4p'|cut -d "/" -f1|cut -d "0" -f2
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第六种

[root@xusx ~]# stat /etc/hosts|grep 'Uid'|grep -o [1-9]*
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[root@xusx ~]#