fnid: Looking up filenames
fnid queries the list of file names stored in the ID database. It accepts shell wildcard patterns on the command line. If no pattern is supplied, * is implied. fnid prints the file names that match the given patterns.
fnid prints file names, and as such accepts the ‘--separator’ option as described in File listing options.
For example, the command:
lists all the .c files in the database. (The ‘\’ here protects the ‘*’ from being expanded by the shell.)