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cfx(1) cfx(1)
NAME
cfx - CP/M File eXpress
SYNOPSIS
cfx [-bdinpw] [-c n] [-m afn] [-t minutes] [files ...]
DESCRIPTION
Cfx provides convenient access to the various file archiving
methods presently associated with computers based on Digital
Research's CP/M operating system and its descendants. By
default, cfx steps through the target file and extracts all
human-readable information to the screen. File extraction
is also supported as a command line option.
The following types of archives are supported (note that the
file extents given below are merely conventions; cfx reads a
file's data to distinguish its archive type):
Extent Typical archive type
.lbr Novosielski library format file. This format is
similar in purpose to the familiar MS-DOS .arc and
.zip archives. A set of related files is stored as
a single "library" for convenience and efficiency.
The format is comprised of a binary directory one or
more 128-byte CP/M records in length, followed
sequentially by one or more member files, also com-
prised of one or more CP/M records.
.?q? Squeezed files. Squeezed files contain Huffman-
encoded text or binary data. Squeezing has gener-
ally been replaced more efficient compression meth-
ods. The first two bytes of CP/M squeezed files are
guaranteed to be 76 and FF hex, respectively.
.?z? Crunched files. Crunching is similar to squeezing,
but uses the Lempel-Ziv-Welch algorithm, adapted for
CP/M use by Steve Greenberg. The first two bytes of
CP/M crunched files are guaranteed to be 76 and FE
hex, respectively.
.?y? LZH-compressed files. LZH-compression uses a combi-
nation of Lempel-Ziv-Welch and Huffman techniques.
The first two bytes of CP/M LZH files are guaranteed
to be 76 and FD hex, respectively.
Cfx will also display non-compressed (ASCII) files. High
bits are stripped during display, but not during extraction,
so WordStar and other forms of text which store information
in 8-bit form are handled reliably.
OPTIONS
-b Brief output only. When processing library (.lbr)
Rev. 1.1 01-20-92 Page 1
cfx(1) cfx(1)
files, suppress initial directory display.
-c n Monitor COM n for carrier (MSDOS only).
-d Extract files to current disk directory. Com-
pressed files are extracted to the filenames stored
at file compression time. (See option -n).
-i Display file information only. Overrides most
other options.
-m afn Specify a subset of library members for processing.
Limited to one ambiguous or unambiguous parameter.
-n Don't uncompress library file members. Intended
for use in conjunction with option -d (disk out-
put).
-p Display file name, compression method and datestamp
to the screen and prompt the user before processing
each file.
-t minutes
Allow only minutes time. Intended for use on
remote systems which limit the amount of connect
time a caller is allowed.
-w Wait for keystroke before returning control to the
parent environment.
BUGS
Screen length fixed at 24 rows.
Does not prompt before overwriting files.
Does not display embedded file datestamps.
Does not restore datestamps of output files.
Not yet extensively tested with nested .LBR files.
SEE ALSO
Cfx User's Manual, arc(1), unzip(1), compress(1), pack(1).
AUTHOR
Carson Wilson
..!uunet!ddsw1!carson
carson@sputnik.uucp
Rev. 1.1 01-20-92 Page 2