ProDOS extended syntax: 'VERIFY' with no filename displays a copyright
notice.

WRITE filename[,Rnum]
[Basic programs only, not from command line.] Specifies that
subsequent output shoud go to an already OPENed or APPENDed file. If
specified from a random access file, the ',Rnum' jumps to the
specified record number. For more information on accessing text files
from within Basic, please see the Applesoft Basic FAQ at
http://www.visi.com/~nathan/a2/faq/asoft.html

ProDOS extended syntax: the ',Fnum' lets you go to the specified line
number, and/or ',Bnum' to go to the specified byte position from the
current. If multiple params are specified, the record number is jumped
to first, then field, then byte.

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Section 5: Miscellaneous questions and answers

5.1: Which OS am I in?

The best method of checking is to use a command not found in both DOS
3.x and ProDOS, such as 'CAT'. If that command works, you're in
ProDOS. If not, try 'CATALOG'-- if the 'CATALOG' fails, you have
neither standard DOS 3.3 nor standard ProDOS loaded.

5.2: How do I format a disk?

Under DOS 3.x, use the INIT command to format a disk, write the
current memory image of DOS 3.x to the disk, and the current Basic
program as the startup program. If the INIT command is not recognized,
you are either in ProDOS or you are using a nonstandard patchset to
DOS 3.x that removed the INIT command.

ProDOS has no builtin disk formatting code; it was removed to make
space. You will need to use an application capable of doing the
formatting-- common ones are those found on the ProDOS 8 system
utilities disk provided by Apple, Copy ][+, Shrinkit, Appleworks, or
several other programs. After formatting a ProDOS disk, you will need
to copy the 'PRODOS' file and at least one 'SYS' file with name ending
in '.SYSTEM' (e.g. BASIC.SYSTEM) to make it bootable, or you'll get an
'UNABLE TO LOAD PRODOS' error on trying to boot that disk.

5.3: How do I copy/move files/disks?

This functionality is not built in to either DOS 3.x or ProDOS from
the commandline; you will need to run an application to do so. ProSEL
8 published by Charlie's Appleseeds can do a good job at that. Copy
][+ does not follow the rules, and is NOT safe to use on hard drives
with ProDOS-- it tends to corrupt the disk if any GS/OS 'extended'
files are present.

In a pinch, if you only need to copy files, you can manually LOAD/SAVE
or BLOAD/BSAVE to load and then save files from one disk to another,
but this is extremely tedious, does not tend to work (unless uses
extra params under ProDOS) on large (>35K) files or non-basic/binary
files, and errprone.