How to load new shared libraries on linux?

■ Requirement : How to load new shared libraries on linux
■ OS Environment : Linux[RHEL, Centos]
■ Assumption : adding pgsql libs
■ Implementation Steps : 

1. As root, edit file /etc/ld.so.conf. Add a line like /usr/local/pgsql/lib
2. Then run command :

$  /sbin/ldconfig

3.In a bash shell, type :

$ export LD_LIBRARY_PATH=/usr/local/pgsql/lib

4. In a csh shell, type

$ setenv LD_LIBRARY_PATH /usr/local/pgsql/lib