102.3 Manage shared libraries

Question 1

What is a shared library?

Answer 1

A shared library is a file containing functionality that other apps can use.

Question 2

What is the extension of shared libraries?

Answer 2

.so (shared object)

Question 3

What quality do .so files have?

Answer 3

They are dynamic shared libraries

Question 4

What is a file that ends in .a?

Answer 4

It is a statically linked library file

Question 5

What is a statically linked library file compiled for?

Answer 5

It is compiled for applications that need to make sure that when they call out to a particular function that it is the same version of the function every time it calls it.

Question 6

What command prints out shared object libraries used by a binary file (an app or program)?

Answer 6

ldd pathtoprogram

Question 7

What command lists the most recently used libraries?

Answer 7

ldconfig

Question 8

Which is the configuration file that points to directories and other config files that hold references to library directory locations?

Answer 8

/etc/ld.so.conf

Question 9

What do the /lib and /lib64 directories contain?

Answer 9

They contain library files that contain code shared to other applications in the system.

Question 10

What location in the FS can you find shared libraries on?

Answer 10

/lib
/usr/lib (for 32bit systems)
/usr/lib64 (for 64bit systems)
/usr/local/lib
/usr/share