Explain the difference between a static library and a dynamic library? 

Static library is linked into the executable, while a dynamic library (or shared object) is loaded while the executable has started. 
 

How do you create a static library?

If you have a collection of object (.o) files, you can do it by running ar command. Generally a static library has a .a extension, and you can link it into an executable by providing -l libraryname to gcc. 
 

Where should the developed libraries be installed on the system? 

GNU recommends /usr/local/bin for binaries and /usr/local/lib for libraries. 
 

What’s LD_LIBRARY_PATH? 

It’s an environment variable that lists all the directories which should be searches for libraries before the standard directories are searched. 
 

How do you create a shared library? 

Create the object file with -fPIC for position-independent code, then run gcc with -shared option. 
 

How do you install a shared library?

Run ldconfig in the standard directory that it’s installed in. 
 

What does ldd do? 

It shows a list of installed shared libraries. 
 

How do you dynamically load a library in your app?

Use dlopen() 
 

What does nm command do? 

It reports the list of symbols in a given library. 

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