Which of the following programs is used to search for files in a file system?

locate searches a prebuilt index database (typically updated by updatedb) to find files matching a given name or pattern extremely quickly without traversing the live filesystem. It is a standard utility on Linux systems for file searching by name, and is part of the mlocate or findutils-locate packages depending on the distribution.

'showfiles' is not a standard Linux or Unix utility and does not exist as a recognized file-search command.

'flocate' is not a standard Linux command; there is no utility by that name in common Linux distributions.

'search' is not a standard Linux file-search utility in common distributions.

'findfiles' is not a standard Linux command; the standard tools for file searching are locate and find.