The file command is used to identify a particular file according to the
type of data contained by the file. File can identify many different
file types, including ELF binaries, system libraries, RPM packages, and
different graphics formats.

You should install the file package, since the file command is such a
useful utility.

-rwxr-xr-x    1 root    root            10076 sep 21 01:38 /usr/bin/file
drwxr-xr-x    2 root    root                0 sep 21 01:38 /usr/share/doc/file-4.10
-rw-r--r--    1 root    root             4958 jui 24 16:38 /usr/share/doc/file-4.10/ChangeLog
-rw-r--r--    1 root    root             1997 mar 23  2003 /usr/share/doc/file-4.10/LEGAL.NOTICE
-rw-r--r--    1 root    root             1259 mar 22  2003 /usr/share/doc/file-4.10/MAINT
-rw-r--r--    1 root    root             4479 mai 23  2003 /usr/share/doc/file-4.10/README
-rw-r--r--    1 root    root             6272 sep 21 01:38 /usr/share/man/man1/file.1.bz2
-rw-r--r--    1 root    root             2797 sep 21 01:38 /usr/share/man/man4/magic.4.bz2
drwxr-xr-x    2 root    root                0 sep 21 01:38 /usr/share/misc/file
-rw-r--r--    1 root    root           356898 sep 21 01:38 /usr/share/misc/file/magic
-rw-r--r--    1 root    root           759040 sep 21 01:38 /usr/share/misc/file/magic.mgc
-rw-r--r--    1 root    root            30231 sep 21 01:38 /usr/share/misc/file/magic.mime
-rw-r--r--    1 root    root            41728 sep 21 01:38 /usr/share/misc/file/magic.mime.mgc
lrwxrwxrwx    1 root    root               10 sep 21 01:38 /usr/share/misc/magic -> file/magic
-rw-r--r--    1 root    root            36823 sep 21 01:38 /usr/share/misc/magic.mime