Exclude a folder while copy in linux

let's say you have main Folder application with 3 folders inside
folderA  folderB folderC and want to exclude folderA the you can simply execute below command

rsync -av --progress application /destinationfolder --exclude folderA  

Shared library support linux

Shared libs are know by linking its path in /etc/ld.so.conf.d/

Recently i came across an error in asterisk while trying to compile OPUS codec as shared lib support to asterisk

asterisk: error while loading shared libraries: libopus.so

But OPUS was install under /usr/local/lib

Now to make it available to asterisk do

echo '/usr/local/lib' > /etc/ld.so.conf.d/usr_local.conf

then update ldconfig by
ldconfig && ldconfig -v