Linux Interview Answers

1. 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.

2. 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.

3. Where should the developed libraries be installed on the system?

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

4. What is 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.

5. How do you create a shared library?

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

6. How do you install a shared library?

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

7. What does ldd do?

   It shows a list of installed shared libraries.

8. How do you dynamically load a library in your app?

   Use dlopen()

9. What does nm command do?

   It reports the list of symbols in a given library.

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Answers sourced from www.techinterviews.com