sys-apps/file
identify a file's format by scanning binary data for patterns
Screenshots
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file-4.24~alpha ~amd64 ~arm ~hppa ~ia64 ~m68k ~mips ~ppc ~ppc64 ~s390 ~sh ~sparc ~sparc-fbsd ~x86 ~x86-fbsdpython
View 
Download License: as-is
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file-4.23alpha amd64 arm hppa ia64 m68k ~mips ppc ppc64 s390 sh sparc ~sparc-fbsd x86 ~x86-fbsdpythonView Download License: as-is
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file-4.21-r1alpha amd64 arm hppa ia64 m68k mips ppc ppc64 s390 sh sparc ~sparc-fbsd x86 ~x86-fbsdpythonView Download License: as-is
Reverse Dependencies
Reverse dependancies are sometimes conditional based on your USE flags, Ebuild version and sometimes other packages. please keep this in mind.