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.

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

Type the following command to get list of all installed software:

# dpkg --get-selections

Type the following command to get list of all installed software:

# sudo dpkg --get-selections

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 also use pkg_info command to display list of all installed packages or software:

# pkg_info | less
# pkg_info apache

Show all installed packages or software in Slackware

Manually:

# ls /var/log/packages

By slapt-get

# slapt-get –installed