linux 动态链接库

ldconfig is a program to maintain the shared library cache. Updates the necessary links.

• the cache is stored in /etc/ld.so.cache

• be default, the shared library files in /usr/lib

• when a new lib installed not in /usr/lib, an error may occur： error while loading shared libraries xxx.so. Cannot open shared object fileL No such file or directory
  哈哈 可能有更好的解决办法，我的办法是

sudo cp /mydir/libopenblas.so /usr/lib/libopenblas.so && ldconfig

ldd : Tells what libraries a given program needs to run. ldd test

symbolic link

• also called `soft link’, like a shortcut in Windows

• to create a symbolic link in Unix, ln -s src_file my_shortcut