How to check what packages are installed in centos 7
How to check and list installed packages in CentOS Linux
How do I check installed packages in CentOS Linux version 6.x/7.x/8.x? How can I List installed packages on CentOS Enterprise Linux server?
This page shows you how to check and list all installed packages in CentOS Linux server version 6.x/7.x/8.x using various command-line utilities. Such a list is useful in case if you need to restore/reinstall or mirror the same packages across different CentOS servers.
** 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
$ sudo yum list installed | more
One can use the grep command as filter too. For example, find out if nginx installed or not:
$ sudo yum list installed | grep python3
Want to lists extras packages installed on the system that are not available in any known repository? Try:
$ yum list extras
Lists all packages known to use:
$ yum list all
Finally, show available packages, run:
$ yum list available
4. To count all installed packages run:
$ yum list installed | wc -l
$ yum list all | wc -l
$ yum list available | wc -l
How to check what packages are installed in centos 7
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.
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:
$ yum list upgrades
$ yum list upgrades | more
$ yum list upgrades | grep -i kernel
*** Get a list of all installed packages with rpm command
sudo rpm -qa
sudo rpm -qa | more
sudo rpm -qa | wc -l
sudo rpm -qa | grep bash
Is nginx and bash package installed? Find out, run:
rpm -q nginx
package nginx is not installed
rpm -q bash
bash-4.2.46-29.el7_4.x86_64
*** How to check for installed packages on CentOS and backup them
How to check for installed packages on CentOS and backup them
$ rpm -qa --qf "%{NAME}\n" |sort /root/installed-software-mm-dd-yyyy.log
To restore all those packages when needed, run:
$ yum -y install $(cat /root/installed-software-mm-dd-yyyy.log)
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