With all this information at hand, we can now proceed to examine *NextZXOS* facilities by task. #### Drive cataloguing It's obvious that simply remembering a file's name and LOADing it, is not possible after the first few files, so we need a command that can help us see which files are stored on a drive. This command is **CAT** (from CATalogue) and its syntax is as follows: **CAT** [-] [*#n*[,]] [*filespec*] **[EXP]** where - is a switch instructing the file list produced to use the short (8+3) format, *#n* is a *NextZXOS stream* for the output of **CAT** to be redirected to, *filespec* follows the conventions described in the *filenames* section earlier and the *modifier* **EXP** produces an expanded listing with more information about the files being listed. All **CAT** parameters are optional and by itself **CAT** will produce a listing of the *default drive* which can be set in the same manner as with **LOAD**, **SAVE** etc. Try the following: ``` LOAD "m:" CAT ``` You will receive the following on your screen ``` No files found 62K free 0 OK, 0:1 ``` Congratulations, you just listed the contents of the *RAMdisk*. Sadly it's empty! Now type: ``` LOAD "c:" CAT ``` Your display now will look similar to this: ``` DEMOS DOCS DOT GAMES MACHINES NEXTZXOS RPI SRC SYS TMP TOOLS LICENSE.MD 6K README.MD 2K TBBLUE.FW 168K TBBLUE.TBU 465K 1887M free 0 OK, 0:1 ``` which is a slightly modified listing of the contents of the *root folder*[^p173-14] of your **System/Next™** distribution. Now type: ``` CAT EXP ``` [^p173-14]: *In filesystems other than IDEDOS and +3DOS that use User Areas, files are organised in an inverted virtual tree of sorts, contained in folders like branches on a trunk of a tree which in turn contain smaller branches and so forth. The top level of the tree is called the root folder or root directory.*