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This lesson covers shared libraries.

Objectives and Skills

Objectives and skills for the shared libraries portion of Linux+ certification include:[1]

  • Manage shared libraries
    • Identify shared libraries
    • Identify the typical locations of system libraries
    • Load shared libraries
    • The following is a partial list of the used files, terms and utilities:
      • ldd
      • ldconfig
      • /etc/ld.so.conf
      • LD_LIBRARY_PATH

Readings

  1. Wikipedia: Library (computing)
  2. Wikipedia: Static library
  3. Wikipedia: ldd (Unix)

Multimedia

Activities

  1. Complete the tutorial IBM: Learn Linux, 101: Manage shared libraries

Lesson Summary

  • LD_LIBRARY_PATH is used to temporarily substitute a different library for this particular execution and is handy for development and testing.[2]
  • ldconfig configures dynamic linker run-time bindings.[3]
  • ldconfig -p prints the lists of directories and candidate libraries stored in the current cache.[4]
  • ldconfig -n processes only the directories specified on the command line and don't rebuild the cache.[5]
  • ldconfig -V prints program version.[6]
  • ldd prints shared object dependencies.[7]
  • ldd prints shared object dependencies.[8]

Key Terms

See Also

References

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