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Old 02-23-2005, 03:04 PM   #1
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Registered: Feb 2005
Distribution: RedHat ES3
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How to tell what packages are installed?

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?

Old 02-23-2005, 03:15 PM   #2
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Registered: Oct 2003
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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
Old 02-23-2005, 03:16 PM   #3
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Registered: Oct 2004
Location: Athens, Greece
Distribution: Slackware, arch
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redhat use rpm packet managment.
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:

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.

Last edited by perfect_circle; 02-23-2005 at 03:22 PM.


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