1、查找/etc目录下大于1M且类型为普通文件的所有文件
[root@db01 scripts]# find /etc -size +1M -type f /etc/udev/hwdb.bin /etc/selinux/targeted/active/policy.kern /etc/selinux/targeted/contexts/files/file_contexts.bin /etc/selinux/targeted/policy/policy.30 /etc/brltty/zh-tw.ctb
2、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@db01 src]# cd /etc/ [root@db01 etc]# tar -cf /usr/local/src/`date +"%F-%T"`.tar *.conf [root@db01 etc]# cd /usr/local/src/ [root@db01 src]# ls 2019-12-04-15:21:34.tar
3、利用sed 取出ifconfig命令中本机的IPv4地址
[root@db01 src]# ifconfig ens160|sed -nr '2s/^[^0-9]+([0-9.]+) .*$/1/p' 192.168.0.199
4、删除/etc/fstab文件中所有以#开头，后面至少跟一个空白字符的行的行首的#和空白字符
[root@db01 src]# sed 's@^#[[:space:]]+@@' /etc/fstab # /etc/fstab Created by anaconda on Thu Nov 7 13:07:01 2019 # Accessible filesystems, by reference, are maintained under '/dev/disk' See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info # /dev/mapper/centos-root / xfs defaults 0 0 UUID=0a4a57b3-645c-4c03-beba-a6a9a4242549 /boot xfs defaults 0 0 /dev/mapper/centos-swap swap swap defaults 0 0
5、处理/etc/fstab路径,使用sed命令取出其目录名和基名
[root@db01 src]# echo "/etc/fstab" | sed 's@[^/]+/?$@@' /etc/ [root@db01 src]# echo /etc/fstab |sed -r 's@(^/.*/)([^/]+)/?$@1@' /etc/ [root@db01 src]# echo /etc/fstab |sed -r 's@(^/.*/)([^/]+)/?$@2@' fstab