Linux Administration/Installation/Shared Libraries

This lesson covers shared libraries.

Objectives and Skills

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

• 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)

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.
• ldconfig configures dynamic linker run-time bindings.
• ldconfig -p prints the lists of directories and candidate libraries stored in the current cache.
• ldconfig -n processes only the directories specified on the command line and don't rebuild the cache.
• ldconfig -V prints program version.
• ldd prints shared object dependencies.
• ldd prints shared object dependencies.

See Also

• TLDP: Shared Libraries

References

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