Linux checking packages installed

How to check and list installed packages in CentOS Linux

How to check installed packages in CentOS

The procedure is as follows to list installed packages:

1. Open the terminal app.
2. For remote server log in using the ssh command: ssh user@centos-linux-server-IP-here
3. Show information about all installed packages on CentOS, run: sudo yum list installed
4. To count all installed packages run: sudo yum list installed | wc -l
5. Want to save all installed packages names in a file? Try: sudo yum list installed > my_list.txt
6. Execute the command sudo yum update to refresh package database and install updates if any.

Let us see all commands and examples in details.

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Check and list installed packages with yum command

From the dnf/yum man page:

The list command dumps lists of packages depending on the packages’ relation to the system. A package is installed if it is present in the RPMDB, and it is available if it is not installed but it is present in a repository that DNF knows about. The list command can also limit the displayed packages according to other criteria, e.g. to only those that update an installed package. The exclude option in configuration file (.conf) might influence the result, but if the command line option –disableexcludes is used, it ensure that all installed packages will be listed.

Hence, to lists installed packages on CentOS, type the following yum command:
sudo yum list —installed
sudo yum list —installed | more

List all installed packages in CentOS Linux using yum

Lists all packages known to us:
sudo yum list —all
Finally, show available packages, run:
sudo yum list —available
One can count all installed packages using the wc command:
sudo yum list —installed | wc -l
sudo yum list —all | wc -l
sudo yum list —available | wc -l

Display packages list that needs updates/patching

Keeping your CentOS box secure is an essential task. One can get a list of all upgrades available for the installed packages too. Type:
sudo yum list —upgrades
sudo yum list —upgrades | more
sudo yum list —upgrades | grep -i kernel
Sample outputs:

Get a list of all installed packages with rpm command

Simply run the following rpm command:
sudo rpm -qa
sudo rpm -qa | more
sudo rpm -qa | wc -l
sudo rpm -qa | grep bash

Use rpm command to display a list of install installed packages on CentOS server

Use repoquery command from dnf-utils package

First, install yum-utils (CentOS 6.x/7.x) or dnf-utils on a CentOS 8.x:
sudo yum install yum-utils ## centos 6.x/7.x ##
sudo yum install dnf-utils ## centos 8.x ##
Sample outputs:

To check installed packages in CentOS Linux, execute:
sudo yum repoquery -a —installed

Display name, architecture and the containing repository of all nginx packages:
sudo yum repoquery —queryformat ‘%.% : %‘ nginx
List all available packages providing “webserver”:
sudo yum repoquery —whatprovides webserver
Or list all available packages providing “webserver” but only for “i686” architecture:
sudo yum repoquery —whatprovides webserver —arch i686

More on repoquery option

Custom display format created using the -qf % or —queryformat % syntax. The % is nothing but a string to output for each matched package. Every occurrence of % < >within is replaced by corresponding attribute of the package. List of recognized tags can be displayed by running
dnf repoquery —querytags
Sample outputs:

For instance, one can build fancy list as follows:
repoquery -a —installed \
—queryformat «%-%-% installed at ‘%‘ from ‘%‘»
Sample outputs:

How to check for installed packages on CentOS and backup them

One can list and backup all installed packages using the following syntax:

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Check Debian/Ubuntu Linux package version using apt-get/aptitude command

Method #1: Ubuntu Linux package version apt-cache command

The syntax is:
apt-cache policy OR
apt-cache madison For example, before I install nginx package I would like to know what version of nginx I would get on my system, run:
$ apt-cache policy nginx
OR
$ apt-cache madison nginx

Fig.01: apt-cache check package version on Debian/Ubuntu Linux

Method #2: Debian Linux package version using apt command

The syntax is
apt list apt list vim
Sample outputs:

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I have vim package # 7.4.963 version installed on my system.

Method #3: Check package version using aptitude command

The syntax is:
aptitude versions aptitude versions | more
aptitude versions | awk < print $2 >
To find htop version you are about to install on Ubuntu server, enter:
$ aptitude versions htop
Sample outputs:

Method #4: Package simulation using aptitude or apt-get command

The syntax is as follows:
aptitude -V -s install apt-get -V -s install No action taken. It perform a simulation of events that would occur based on the current system state but do not actually change the system. Of course, press n when prompted to avoid installation.

A note about finding version of installed packages

Use the following syntax:
apt-show-versions OR
dpkg -s dpkg -s | grep -i version
To see version of install package called vim, run:
$ apt-show-versions vim
vim:amd64/xenial 2:7.4.963-1ubuntu5 uptodate
vim:i386 not installed
OR
$ dpkg -s vim | grep -i version
Version: 2:7.4.963-1ubuntu5
Vim is an almost compatible version of the UNIX editor Vi.
This package contains a version of vim compiled with a rather
version of Vim. See the other vim-* packages if you need more

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How do I see what packages are installed on Ubuntu Linux?

I am a new Ubuntu Linux server user. My server hosted at Google cloud VM. How do I see what packages are installed on Ubuntu Linux?

Introduction: Ubuntu Linux is an open source operating system based upon the Linux kernel and GNU command line utilities. Ubuntu Linux is extremely popular among new Linux users as well as developers all around the globe. This page shows how to list all installed packages with apt command or apt-get command on Ubuntu Linux.

Tutorial details
Difficulty level	Easy
Root privileges	Yes
Requirements	Debian or Ubuntu Linux
Est. reading time	5 minutes

You need to use the apt or apt-get or dpkg command to list all installed packages on an Ubuntu Linux server from the bash shell prompt.

How do I see what packages are installed on Ubuntu Linux?

The procedure to list what packages are installed on Ubuntu:

1. Open the terminal application or log in to the remote server using ssh (e.g. ssh user @ sever-name )
2. Run command apt list —installed to list all installed packages on Ubuntu
3. To display a list of packages satisfying certain criteria such as show matching apache2 packages, run apt list apache

Let us see some examples about how to list installed packages on Ubuntu and Debian Linux operating systems.

apt list installed packages

Let us list all software packages on Ubuntu Linux available for us:
$ apt list

You might want to use the grep command/egrep command to filter out:
$ apt list | grep nginx
OR
$ apt list | more
However, you may see message on screen that read as follows:

WARNING: apt does not have a stable CLI interface. Use with caution in scripts.

To avoid this message use the dpkg command as follows:
$ dpkg —list | grep nginx
$ dpkg —list | more

List all installed packages only

The apt command displays both installed and packages available to install. What if you want to list currently installed software only? Fear not, pass the option to the apt command:
$ apt list —installed

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How to list or find out if a specific package installed or not

Run package policy as follows:
$ apt list -a pkgNameHere
Is sudo package installed?
$ apt list -a sudo
Is sudo package mariadb-server?
$ apt list -a mariadb-server

Ubuntu list installed packages

It is also possible to list installed packages matching given pattern. The syntax is:
dpkg -l pattern
dpkg —list pattern
apt list pattern
apt list —installed pattern
For example:
dpkg —list ‘x*’
Sample outputs:

• ii – Indicates that package named xauth installed.
• un – Indicates that package not installed or in Unknown status.

Listing installed packages sorted by installation date and time

There is no simple command, but we can use the combination of zgrep and other commands as follows. Let us count it:

Total installed packages on nixcraft-wks01 : 6433
List them:
zgrep » installed » /var/log/dpkg.log*

Please note that zgrep will search possibly compressed files for a regular expression as those log files are compressed by system. Hence, we need to use various z commands on Linux. See “How to find out when Debian or Ubuntu package installed or updated” for more info.

Conclusion

You learned how to list both installed and uninstalled packages on an Ubuntu Linux server or desktop using the CLI method. See the following man pages using the man command:
man apt
man apt-get
man dpkg

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How to find out if package is installed in Linux

Debian / Ubuntu Linux

Use dpkg command. It is a package manager for Debian/Ubuntu Linux. Suppose you want to find out package apache-perl or sudo is installed or not, type command:
$ dpkg -s apache-perl
Sample outputs:

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Another example:
$ dpkg -s sudo
Sample outputs:

Use file /var/lib/dpkg/available to find out all package names available to you. Or you can use following command (list all packages in /var/lib/dpkg/status):
$ dpkg-query -l
You can also try to match package name using wild cards:
$ dpkg-query -l ‘libc6*’
Once you’ve found package name, use the following command to get exact status (whether it is installed or not):
$ dpkg-query -W -f=’$ $\n’ apache-perl
Sample outputs:

Red Hat Enterprise / Fedora Linux / Suse Linux / Cent OS

Under Red Hat/Fedora/CentOS/Suse Linux use the rpm command:
$ rpm -qa | grep For example find out package mutt installed or not:
$ rpm -qa | grep mutt
Output:

If you do not see or get any outputs (package name along with version), it means the package is not installed at all. You can display or list all installed packages with the following command:
$ rpm -qa
$ rpm -qa | less
You can conditionally do something if a rpm command succeeded or failed to find package using bash shell if command:

On a CentOS/RHEL version 6.x/7.x and above use the following yum command to tell whether a package named htop is installed:
$ yum list installed
$ yum list installed htop
Sample outputs:

If you are using Fedora Linux, try the following dnf command:
$ dnf list installed
$ dnf list installed htop

See also:

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Category	List of Unix and Linux commands
Documentation	help • mandb • man • pinfo
Disk space analyzers	df • duf • ncdu • pydf
File Management	cat • cp • less • mkdir • more • tree
Firewall	Alpine Awall • CentOS 8 • OpenSUSE • RHEL 8 • Ubuntu 16.04 • Ubuntu 18.04 • Ubuntu 20.04
Linux Desktop Apps	Skype • Spotify • VLC 3
Modern utilities	bat • exa
Network Utilities	NetHogs • dig • host • ip • nmap
OpenVPN	CentOS 7 • CentOS 8 • Debian 10 • Debian 8/9 • Ubuntu 18.04 • Ubuntu 20.04
Package Manager	apk • apt
Processes Management	bg • chroot • cron • disown • fg • glances • gtop • jobs • killall • kill • pidof • pstree • pwdx • time • vtop
Searching	ag • grep • whereis • which
Shell builtins	compgen • echo • printf
Text processing	cut • rev
User Information	groups • id • lastcomm • last • lid/libuser-lid • logname • members • users • whoami • who • w
WireGuard VPN	Alpine • CentOS 8 • Debian 10 • Firewall • Ubuntu 20.04

Comments on this entry are closed.

This is my first massage over here& i hope i will get full support.

How to open usermap.cfg file on NetApp server?- As i have to check whether unix user login is mapped correctly with Windows login.

As the main problem which few of the users are having is as below —

They are NOT able to map from Windows any network
drive (unix accounts) due to they have not access to their share drive.

It ask me for login and password, BUT earliear it never asked me for my windows login and password . It’s been working till the end of the year 2006.

Please suggest solutions—–

Many thanks in Advance

just a small addition –

on Gentoo Linux just do a:

or
cat /var/lib/portage/world

on CentOS or other “yum”-based systems:

yum list installed

how to see the programs and features in redhat linux (e.g– in windows we can check the same through control panel–progrmas)

@john: On RedHat – which is a rpm package management based distribution – you should can use i.e.:

to list all installed packages or

to get out details about the installed package.

how do i verify packages that are installed without using rpm, i mean recently i installed squid using make, make all, configure configure-install

after this, how do I check this package is installed?

…this is not possible as installing “by hand” (make install) has nothing to do with a “package” nor package management.

To find out if i.e. squid was installed just try to locate the squid binary by where, locate or find, even if you build and install software from sources by make.

If you use a port management system from i.e. pkgsrc, getoo portage or even FreeBSD the port management counts each modified and installed file of a port to make it possible to see which file belongs to which port (package) or which are installed etc.

this might be another story.

Thank you very much, I have another issue, I have Installed texlive but I still get an error message in my crm ” pdf latex not installed”, so do you know how check if any software is installed or not ? It’s different from packages, isn’t it ?

If you have a list of packages you want to query, it’s much easier to just list them instead of using grep:

rpm -q automake libtool flex bison pkgconfig gcc-c++ boost-devel libevent-devel

Why such a complicated command for rpm-based systems? On my machine (Fedora 20), I can just run rpm -q $, and it’s *much* faster since it doesn’t need to list every package on the system and then grep through it:

[blong@blong-desktop tmp]$ rpm -q vala; echo $?
vala-0.22.1-1.fc20.x86_64
0
[blong@blong-desktop tmp]$ rpm -q missing-package; echo $?
package missing-package is not installed
1

Is this a new feature?

In Debian based distros like Ubuntu, you can find out if a package is installed with:

apacheInstalled=$(dpkg -s apache2 | grep ‘Status: install ok installed’| wc -l)
#change apache2 to the package you are checking for. returns 1 if installed, 0 otherwise.
#script does not have to be running as root… but to change installed stuff… it would.

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