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How to determine which repo a RHEL/CentOS package belongs to

I thought this command should show me which repo the package ‘htop’ belongs to, but I was wrong:

[root@server ~]# yum info htop
Loaded plugins: rhnplugin, security
Installed Packages
Name : htop
Arch : x86_64
Version : 0.8.3
Release : 1.el5
Size : 136 k
Repo : installed 
Summary : Interactive process viewer
URL : http://htop.sourceforge.net/
License : GPL+
Description: htop is an interactive text-mode process viewer for...

Notice that it merely indicates ‘installed’ for the ‘Repo’ field? Not very helpful here. I wonder why yum works this way.

To find out which repo ‘htop’ comes from, use this command instead:

[root@server ~]# yum provides `which htop`
Loaded plugins: rhnplugin, security
htop-0.8.3-1.el5.x86_64 : Interactive process viewer
Repo : epel
Matched from:
Filename : /usr/bin/htop

htop-0.8.3-1.el5.x86_64 : Interactive process viewer
Repo : installed
Matched from:
Other : Provides-match: /usr/bin/htop

See ‘epel’ there? Bingo!

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