How to tell what packages are installed?

KMorley · 02-23-2005, 02:04 PM

I've just installed RedHat ES3 and I'm patching to the latest rev. I'm going to install ClamAV which has some prerequisites, such as zlib, zlib-devel, gcc compiler suite, bzip2, bzip2-devel, etc.

What command can I use to determine if these packages are installed and, if so, what version is installed?

Thanks!

homey · 02-23-2005, 02:15 PM

There are several ways to get the info.
Sometimes the program will give version by using the command: gcc --version

You can use another command which indicates the item is installed and where it's at....
# whereis zlib
zlib: /usr/include/zlib.h /usr/share/man/man3/zlib.3.gz

Here is another method for rpm based systems .....
# rpm -qa | grep bzip2
bzip2-1.0.2-13
bzip2-devel-1.0.2-13
bzip2-libs-1.0.2-13

perfect_circle · 02-23-2005, 02:16 PM

redhat use rpm packet managment.
type:
rpm -qa |grep gcc
to see all the installed packages that their name contain the word gcc.
Most if not all the packages use this kind of formula for naming:
<package_name>-<version>

*EDIT*
if you simply type rpm -qa all installed packages will be displayed

a command like:
rpm -qa > packages.txt
will print all the installed packages in the file package.txt

use rpm -qa| less
to pipe the results through less.
This will make the output to stay still and you can use the arrows (up/down) to view the output. you terminate "less" with q.