1鳍寂、查找/etc目錄下大于1M且類型為普通文件的所有文件

[root@centos7 ~]# find /etc -size +1M -a -type f -exec ls -lh {} \;
-r--r--r--. 1 root root 8.0M May  9 17:35 /etc/udev/hwdb.bin
-rw-r--r--. 1 root root 1.4M May  9 17:32 /etc/selinux/targeted/contexts/files/file_contexts.bin
-rw-r--r--. 1 root root 3.7M May  9 17:32 /etc/selinux/targeted/policy/policy.31
-rw-------. 1 root root 3.7M May  9 17:32 /etc/selinux/targeted/active/policy.kern
-rw-------. 1 root root 3.7M May  9 17:32 /etc/selinux/targeted/active/policy.linked
-rw-r--r--. 1 root root 1.4M Apr 11  2018 /etc/brltty/zh-tw.ctb

2记劈、打包/etc/目錄下面所有conf結(jié)尾的文件本刽，壓縮包名稱為當(dāng)天的時(shí)間，并拷貝到/usr/local/src目錄備份承冰。

[root@centos7 ~]# tar -zcvpf /usr/local/src/`date +"%F_%T"`.tgz /etc/*conf

3、利用sed 取出ifconfig命令中本機(jī)的IPv4地址

[root@centos7 ~]# ifconfig ens33|sed -n -r '2s/(^[^0-9]+)([0-9.]+)( .*$)/\2/p'
192.168.58.131

4食零、刪除/etc/fstab文件中所有以#開頭困乒，后面至少跟一個(gè)空白字符的行的行首的#和空白字符

[root@centos7 ~]# cp /etc/fstab /data/
[root@centos7 ~]# sed -i -r 's/^#[[:space:]]+(.*)/\1/p' /data/fstab
[root@centos7 ~]# cat /data/fstab

#
/etc/fstab
/etc/fstab
Created by anaconda on Sat May  9 17:22:35 2020
Created by anaconda on Sat May  9 17:22:35 2020
#
Accessible filesystems, by reference, are maintained under '/dev/disk'
Accessible filesystems, by reference, are maintained under '/dev/disk'
See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
UUID=851c4aea-457e-4591-8226-b7cc938a7864 /                       xfs     defaults        0 0
UUID=a2943667-4cd5-4058-a0f4-2552dc106b35 /boot                   xfs     defaults        0 0
UUID=817c0830-1a6b-4345-89d2-2567e8fbd37d /data                   xfs     defaults        0 0
UUID=ed947da9-28d8-4361-bf8a-ccfa7b361ab6 swap                    swap    defaults        0 0

5、處理/etc/fstab路徑,使用sed命令取出其目錄名和基名

[root@centos7 ~]# echo /etc/fstab |sed -n -r 's@(^.*/)([^/]+)/?@\1@p'  //取目錄名
/etc/
[root@centos7 ~]# echo /etc/fstab |sed -n -r 's@(^.*/)([^/]+)/?@\2@p'  //取基名
fstab