1、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。 ~~~sh [root02:26 PMcentos7 ~]#cd /etc [root02:26 PMcentos7 /etc]#find -name "*.conf" |xargs tar zcf /usr/local/src/`date +%F_%T`.tar.gz [root02:26 PMcentos7 /etc]#ls /usr/local/src/ 2021-06-08_14:26:42.tar.gz [root02:27 PMcentos7 /etc]#tar tvf /usr/local/src/2021-06-08_14\:26\:42.tar.gz -rw-r--r-- root/root 232 2021-06-01 07:32 ./X11/xorg.conf.d/00-keyboard.conf -rw-r--r-- root/root 215 2020-10-20 00:28 ./modprobe.d/dccp-blacklist.conf -rw-r--r-- root/root 166 2020-10-01 00:12 ./modprobe.d/firewalld-sysctls.conf -rw-r--r-- root/root 674 2019-03-22 06:10 ./modprobe.d/tuned.conf -rw-r--r-- root/root 5171 2018-10-31 04:26 ./man_db.conf -rw------- root/root 232 2020-12-16 00:27 ./autofs_ldap_auth.conf ~~~ 2、查找当前系统上没有属主或属组，且最近一个周内曾被访问过的文件或目录 ~~~sh [root02:10 PMcentos7 ~]#find / \( -nouser -o -nogroup \) -atime -7 ~~~ 3、查找/etc目录下至少有一类用户没有执行权限的文件 ~~~sh [root02:17 PMcentos7 ~]#find /etc/ ! -perm /111 -ls ~~~ 4、自建网络yum源（通过httpd实现) ~~~sh #!/bin/bash mkdir -p /etc/yum.repos.d/backups mv /etc/yum.repos.d/* /etc/yum.repos.d/backups &>/dev/null cat > /etc/yum.repos.d/tests.repo </dev/null && echo "httpd 服务器搭建成功" mkdir /var/www/html/centos/8 -p mount /dev/sr0 /var/www/html/centos/8 systemctl enable --now httpd;systemctl disable --now firewalld cd /var/www/html/centos/;mkdir extras dnf reposync --repoid=extras --download-metadata -p /var/www/html/centos && echo "extras 本地仓库配置成功" dnf install epel-release -y && echo "在extras的基础上epel源安装成功" dnf reposync --repoid=epel --download-metadata -p /var/www/html/ && echo "epel本地仓库安装成功" cd /var/www/html/epel/ && wget https://mirrors.tuna.tsinghua.edu.cn/epel/RPM-GPG-KEY-EPEL-8 && echo "验证秘钥下载成功" echo "============================================私有repo仓库服务端搭建成功=========================================" ~~~ 5、利用sed 取出ifconfig命令中本机的IPv4地址 ~~~sh [root02:44 PMcentos8 /tmp]#ifconfig | sed -rn '2s/^[^0-9]+([0-9.]+) .*$/\1/p' ~~~ 6、删除/etc/fstab文件中所有以#开头，后面至少跟一个空白字符的行的行首的#和空白字符 ~~~sh [root03:10 PMcentos7 ~]#cat /etc/fstab |sed -r 's/^#[ ]?(.*)/\1/'|sed '/^$/d' /etc/fstab Created by anaconda on Tue Jun 1 07:29:32 2021 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 UUID=4c642aab-09a0-4f1e-9aea-d68051e2f666 / ext4 defaults 1 1 UUID=84300afa-1fee-4f61-a164-e1acf128035c /boot ext4 defaults 1 2 UUID=08451999-3121-4549-8661-021910d05ede /data ext4 defaults 1 2 UUID=d534076f-002a-4e56-aab9-4780eedb2acc swap swap defaults 0 0 UUID=e010e090-33a8-461f-a58c-3483505e52ae /test ext4 acl 0 0 ~~~ 7、处理/etc/fstab路径,使用sed命令取出其目录名和基名 ~~~sh #取目录名 [root03:12 PMcentos7 ~]#echo /etc/fstab |sed -r 's/(.*)\/[^\].*/\1/' /etc #取基名： [root03:20 PMcentos7 ~]#echo /etc/fstab/ |sed -r 's#.*\/([^/]+)\/?$#\1#' fstab ~~~