This demo assumes you are already using a SSH client, and you know how to navigate it. For this example, we are using PuTTY.
1) Change to the directory that the file/folder you wish to change the permissions of resides in
Example: cd /public_html/
2) Use the CHMOD command to change the permissions of the file/folder you wish to modify
Example: chmod 755 test.php
For more information about permissions, please see this article.
That’s it! You have now changed the permissions for this file.