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There is no command as such. Unlike in Windows, a program in Linux does not have to register it's existence in a list or registry. If you installed the program manually, or use a distro without a package manager, there is no way to determine what is installed. On distros that have package managers, such as Debian, Fedora, or Ubuntu, you can usually print an output of installed packages. In Debian / Ubuntu, use the command

dpkg --get-selections | less

to scroll through a list of installed packages. I do not recall offhand what you would do in Fedora or Red Hat.

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