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I want to find out what version of a C library is installed in my system (Ubuntu 12.04). In particular, I'm interested in libnuma. What is the proper way to do it?
cd /usr/lib
ls -l libnuma*
-rw-r--r-- 1 root root 70312 Feb 8 2012 libnuma.a
lrwxrwxrwx 1 root root 12 Feb 8 2012 libnuma.so -> libnuma.so.1
-rw-r--r-- 1 root root 43976 Feb 8 2012 libnuma.so.1
I would use dpkg -l | grep libnuma1 to get the version.
As an example, I have ran dpkg -l on xterm and you can see that I'm running versoin 278-4 of xterm.
# dpkg -l | grep xterm
ii lxterminal 0.1.11-4 amd64 LXDE terminal emulator
ii xterm 278-4 amd64 X terminal emulator
dpkg does not care about libs/apps not installed by dpkg
.so). When you compile and install a library yourself, it's up to you to keep track of where it came from (which is why packaging systems were created).
You should try
ldconfig -v | grep libnuma
ldconfig -v | grep libnuma shows libnuma.so.1 -> libnuma.so.1.0.0, but dpkg -l | grep libnuma1 shows ii libnuma1:amd64 2.0.12-1. This variant does not look reliable.
The file name or contents won't always keep track of the exact version, so you'd typically want to use the packaging system facilities. For Ubuntu, you can either go to packages.ubuntu.com, search for your file, and see what version of the package is in your version of Ubuntu.
Or from the command line, you can first search for the name of the associated package using dpkg -S /usr/lib/libnuma.so.1, which probably returns libnuma1 as the package name. Then run apt-cache showpkg libnuma1 to find the package version. The apt-cache output can be pretty long, but the version should be in the first few lines.
