Linux / UNIX: Change File Permissions Recursively (conditional)

To find all files in /home/user/demo directory, enter:

find /home/user/demo -type f -print

To find all files in /home/user/demo directory with permission 777, enter:

find /home/user/demo -type f -perm 777 -print

Finally, apply new permission using the -exec option as follows:

$ find /home/user/demo -type f -perm 777 -print -exec chmod 755 {} ;

To select directories and subdirectories use the following syntax:

$ find /var/www/html -type d -perm 777 -print -exec chmod 755 {} ;