lk/fundamentals/packages.md
2020-01-02 01:04:35 +01:00

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Looking

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Maintenance

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

  • libc.so.6

  • 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.