Linux Interview Answers
- 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 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.
- 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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Answers sourced from www.techinterviews.com
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