only list installed duplicate packages
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+\fBOutput:\fR
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+The list command searches packages for the name given. If found, the following info will be displayed: the package location between the first square brackets (I for Installed packages, P for Portage, O for Overlay), the possible masks between the second (~ by keyword, - by arch or M hard masked), then the category and complete name and last of all, the slot in which the package is stored.
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\fBExamples:\fR
equery list zilla \- list all installed versions of packages containing the string 'zilla'