lk/basics/packages.md

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---
title: "packages"
tags: [ "Documentation", "basics" ]
---
2020-01-02 00:04:35 +00:00
# Looking
Your package has something to do with unzipping. Find out more:
> apropos unzip
# 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.