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If you file you need to set permissions on and there is another file that already has the desired permissions, use the –reference switch with chmod.

chmod –reference <reference file> <target file>

Example:  Say eDirectory is not starting or even cores on startup.  Taking a strace points to a library.  You see symbolic link for libldapsdk.so is missing.  libldapsdk.so.0 is there.

You can quickly create the symbolic link with the ln -s command

ln -s libldapsdk.so.0.0.0 libldapsdk.so

The permissions now need to be set.  For this library it is simple, chmod 777, but some say you are not good with chmod or the permissions are a little different.  The easy way to do set the files is copy from another library link.

chmod –reference libldapsdk.so.0 libldapskd.so