fid - List identifiers that occur in FILENAME

       List identifiers that occur in FILENAME, or if FILENAME2 is also given list the identifiers that occur in
       both files.

       -f, --file=FILE
              file name of ID database

       --help display this help and exit

       --version
              output version information and exit

       fid - List identifiers that occur in FILENAME

       Report bugs to bug-idutils@gnu.org

       The  full  documentation for the id-utils package is maintained as a Texinfo manual.  If the info and id-utils packages are properly installed, the command

              info'IDdatabase'

       should give you access to the complete manual.

fid - 4.6.28-15da                                   May 2020                                              FID(1)

fid [OPTION] FILENAME [FILENAME2]