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dpkg -l
List what's installed.
Libraries
Libraries under /lib/ typically contain an .so suffix when they're dynamic. It means 'shared object' as a number of programs will refer to it.
Others will have an /a/ suffix, meaning that they're static, and will be loaded at runtime.
We can check the dependencies of a program using the ldd command upon anything in a library. For example:
ldd/usr/bin/md5sum
... shows us that md5sum depends upon:
-
linux-vdso.so.1
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libc.so.6
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lib64/ld-linux-x86-64.so.2
To list all libraries, run:
ldconfig -p
For example, if looking at /usr/lib/x86_64-linux-gnu/libXcomposite.so.1, we might wonder what it's for. We can then run:
ldconfig -p | grep libXcomposite
... and find out nothing except that it redirects /usr/lib/x86...
So at least we know where it is.
ldconfig -p | grep usb
... this will show where things which nominally relate to usbs live.
You can add to the libarary path by putting just any text file in /etc/ld.so.cache, e.g. in Arch where the path to the fakeroot environment is placed there.