第五周作业—N42-虚怀若谷

提示：扫一扫查出行
【扫一扫了解最新限行尾号】
复制提示

一、查找/etc目录下大于1M且类型为普通文件的所有文件

[root@centos7 ~]# find /etc -type f -size +1M -exec ls -lh {} \;

-r--r--r--.  root root 7.8M Oct  : /etc/udev/hwdb.bin

-rw-------.  root root 3.8M Nov     /etc/selinux/targeted/active/policy.kern

-rw-r--r--.  root root 1.4M Nov     /etc/selinux/targeted/contexts/files/file_contexts.bin

-rw-r--r--.  root root 3.8M Nov     /etc/selinux/targeted/policy/policy.

-rw-r--r--.  root root 1.4M Apr    /etc/brltty/zh-tw.ctb

二、打包/etc/目录下面所有conf结尾的文件，压缩包名称为当天的时间，并拷贝到/usr/local/src目录备份

[root@centos7 ~]# ls /etc/*.conf

/etc/asound.conf                 /etc/kdump.conf      /etc/pnm2ppa.conf

/etc/autofs.conf                 /etc/krb5.conf       /etc/radvd.conf

...省略若干

[root@centos7 ~]# tar -czvf `date +%F`.tar.gz /etc/*.conf

tar: Removing leading `/' from member names

/etc/asound.conf

/etc/autofs.conf

/etc/autofs_ldap_auth.conf

...省略若干

[root@centos7 ~]# ls

2019-11-26.tar.gz  Desktop    Downloads             Music     Public     Videos

anaconda-ks.cfg    Documents  initial-setup-ks.cfg  Pictures  Templates

[root@centos7 ~]# cp 2019-11-26.tar.gz /usr/local/src/

[root@centos7 ~]# ls -l /usr/local/src/

total 52

-rw-r--r-- 1 root root 49669 Nov 26 13:35 2019-11-26.tar.gz

三、利用sed取出ipconfig命令中本机的IPv4地址

[root@centos7 ~]# ifconfig eth0|sed -nr '2s/^[^0-9]+([0-9.]+) .*$/\1/p'

172.16.236.134

[root@centos7 ~]# ifconfig eth1|sed -nr '2s/^[^0-9]+([0-9.]+).*/\1/p'

192.168.214.7

四、删除/etc/fstab文件中所有以#开头，后面至少跟一个空白字符的行的行首的#和空白字符

[root@centos7 ~]# cat /etc/fstab 

#

# /etc/fstab

# Created by anaconda on Mon Oct  ::

#

# Accessible filesystems, by reference, are maintained under '/dev/disk'

# See man pages fstab(), findfs(), mount() and/or blkid() for more info

#

UUID=4c35d267-ce4a-4ede-add4-64da62067bfb /                       xfs     defaults

UUID=71e72e0a--4edd-b321-fef6ab4ba406 /boot                   xfs     defaults

UUID=67285b9c-6dea--b48b-d6103ba3cfcb /data                   xfs     defaults

UUID=0da7a17b-95d7-4c1a-9fe3-f1969b73df9f swap                    swap    defaults         


[root@centos7 ~]# sed -r 's/^#[[:space:]]+//' /etc/fstab 

#

/etc/fstab

Created by anaconda on Mon Oct  ::

#

Accessible filesystems, by reference, are maintained under '/dev/disk'

See man pages fstab(), findfs(), mount() and/or blkid() for more info

#

UUID=4c35d267-ce4a-4ede-add4-64da62067bfb /                       xfs     defaults

UUID=71e72e0a--4edd-b321-fef6ab4ba406 /boot                   xfs     defaults

UUID=67285b9c-6dea--b48b-d6103ba3cfcb /data                   xfs     defaults

UUID=0da7a17b-95d7-4c1a-9fe3-f1969b73df9f swap                    swap    defaults

五、处理/etc/fstab路径，使用sed命令取出其目录名和基名

[root@centos7 ~]# echo "/etc/fstab"|sed -r 's#(^.*/)([^/]+)/?#\1#'   #取目录名

/etc/

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

fstab