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+.TH FID 1
+.SH NAME
+fid \- query id database for specific files
+.SH SYNOPSIS
+.B fid
+.RB [ \-f \^file]
+file1 [ file2 ]
+.SH DESCRIPTION
+.I Fid
+is a query tool for the id database. If you specify a single file
+name as an argument, it prints a list of all the identifiers that
+occur in that file.
+.PP
+When you give it two file names it takes the intersection. It prints
+only the list of identifiers that occur in both files.
+.PP
+The following options are recognized:
+.TP 10
+.BR \-f file\^
+Use
+.I file\^
+as the database instead of the default
+.BR ID .
+.SH SEE ALSO
+mkid(1),
+lid(1).