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GNU Emacs Manual

M.15 File Name Cache

You can use the file name cache to make it easy to locate a file by name, without having to remember exactly where it is located. When typing a file name in the minibuffer, C-tab (file-cache-minibuffer-complete) completes it using the file name cache. If you repeat C-tab, that cycles through the possible completions of what you had originally typed. Note that the C-tab character cannot be typed on most text-only terminals.

The file name cache does not fill up automatically. Instead, you load file names into the cache using these commands:

M-x file-cache-add-directory RET directory RET

Add each file name in directory to the file name cache.

M-x file-cache-add-directory-using-find RET directory RET

Add each file name in directory and all of its nested subdirectories to the file name cache.

M-x file-cache-add-directory-using-locate RET directory RET

Add each file name in directory and all of its nested subdirectories to the file name cache, using locate to find them all.

M-x file-cache-add-directory-list RET variable RET

Add each file name in each directory listed in variable to the file name cache. variable should be a Lisp variable such as load-path or exec-path, whose value is a list of directory names.

M-x file-cache-clear-cache RET

Clear the cache; that is, remove all file names from it.