1. Find all files in the /etc directory that are larger than 1M and of type ordinary files
2. Pack all the files ending with conf under the /etc/ directory, the compressed package name is the time of the day, and copy to the /usr/local/src directory for backup.
3. Use sed to get the IPv4 address of the machine in the ifconfig command
4. Delete all the # and blank characters at the beginning of the line that starts with # and at least one blank character in the /etc/fstab file. 
5. Process the /etc/fstab path and use the sed command to retrieve its directory name and base name