The equivalent of the classic "files" command in gdb is the "info sources" command. Normally the gdb command does not support pattern matching like "files" does however since the feature exists in the classic interface the info sources should be extended with this same capability; This means that a command like: "info sources time" will return all the sources for which symbols are read that have "time" in their file name.

Completed the command replacement from classic "files" to "info sources".