Managing shared libraries (Part 1)

The syntax of Linux libraries is like in these two examples:

$ ls /lib/x86_64-linux-gnu/libapparmor.so.1.4.2

$ ls /lib/systemd/libsystemd-shared-237.so

These are the libraries configuration files:

$ cat /etc/ld.so.conf

$ ls /etc/ld.so.conf.d/

There are several locations where the libraries can be found:

$ ls -d /lib*

$ ls -d /usr/lib*

$ ls -F /lib

With this binary I can dynamically load another binaries or apps needed libraries (there's an example at end):

$ ls -F /lib64

We can see all the needed libraries for the uptime command (but we need the full path):

$ which uptime

$ ldd /bin/uptime

It shows not only the libraries needed but also their location.

Check if the uptime command has all the libraries needed:

$ /lib64/ld-linux-x86-64.so.2 /bin/uptime

(it executes the command perfectly so all the libraries are found.)

To continue learning about libraries, check Part 2.