For a linux user , i suggest you to know about “chmod” command deeply. It’s because “chmod” command  is always  used when you’re going to change access file permission. For example after you upgrade to the recent version of your website then the file permission need to be changed  in your server for security reason, you must need to use chmod command.

I just remember when i gave the linux training , i always give a challenge to students to solve some cases of using chmod . and from those the students will know how important and power full of chmod.

I will give you an example command to change all files permission to 644 and all directories permission to 755 in the “/home/coba ” directory :

If you need to make sure the changes , you’re able to use ls -la command on each directory