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Show all installed packages or software in Linux, FreeBSD, OpenBSD

Q. I am using CentOS how do I show all installed packages in Linux?

A. You need to use rpm command to display all installed packages in Linux.

Red Hat/Fedora Core/CentOS Linux

Type the following command to get list of all installed software
# rpm -qa | less
Show all installed packages or software in Red Hat/Fedora Core/CentOS Linux with YUM
# yum list installed
Redirect the std out into a file with a command like this:
rpm -qa | less > output.txt


Debian Linux

Type the following command to get list of all installed software:
# dpkg --get-selections


Ubuntu Linux

Type the following command to get list of all installed software:
# sudo dpkg --get-selections


FreeBSD

Type the following command to get list of all installed software:
# pkg_info | less
# pkg_info apache
Use pkg_version command to summarizes the versions of all installed packages:
# pkg_version | less
# pkg_version | grep 'lsof'


OpenBSD

OpenBSD also use pkg_info command to display list of all installed packages or software:
# pkg_info | less
# pkg_info apache


Slackware

Show all installed packages or software in Slackware

Manually:
# ls /var/log/packages
By slapt-get
# slapt-get –installed